Articles

Articles are a collaborative effort to provide a single canonical page on all topics relevant to the practice of radiology. As such, articles are written and edited by countless contributing members over a period of time. A global group of dedicated editors oversee accuracy, consulting with expert advisers, and constantly reviewing additions.

751 results found
Article

Hemorrhagic corpus luteal cyst

Hemorrhagic corpus luteal cysts result from bleeding into corpus luteal cysts. Radiographic features Ultrasound Commonly described findings include: complex adnexal mass adnexal thick-walled cystic lesion with lace-like strands adnexal thick-walled cystic lesion with low-level echoes withi...
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Hanging noose sign

Hanging noose sign in obstetric imaging is a rarely described but classical finding of a true umbilical cord knot. It demonstrates a transverse section of the umbilical cord surrounded by a loop of umbilical cord and changes in the pressure of the knot can be demonstrated with the fetal movement...
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Head circumference

Head circumference (HC) is one of the basic biometric parameters used to assess fetal size. HC together with biparietal diameter (BPD), abdominal circumference (AC), and femur length (FL) are computed to produce an estimate of fetal weight. In the second trimester, this may be extrapolated to an...
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HELLP syndrome

HELLP syndrome is a pregnancy-related condition and is an abbreviation for: haemolysis elevated liver enzymes and  low platelets It is considered a severe and life-threatening form of pre-eclampsia although it can occur without co-existing pre-eclampsia.  Epidemiology The estimated inciden...
Article

Hemimegalencephaly

Hemimegalencephaly is a rare congenital disorder of cortical formation with hamartomatous overgrowth of all or part of a cerebral hemisphere. This results from either increased proliferation or decreased apoptosis (or both) of developing neurons 2. Epidemiology Hemimegalencephaly is a cryptoge...
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Hemivertebra

Hemivertebra is a type of vertebral anomaly and results from a lack of formation of one half of a vertebral body. It is a common cause of congenital scoliosis.  Epidemiology The estimated incidence is at ~0.3 per 1000 live births 2. Pathology It falls under the spectrum of segmentation anoma...
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Herlyn-Werner-Wunderlich syndrome

Herlyn-Werner-Wunderlich (HWW) syndrome, is a rare anomaly characterized by Müllerian duct anomalies (MDA) associated with mesonephric duct anomalies 3. This entity is also known as obstructed hemivagina and ipsilateral renal anomaly (OHVIRA). It is not to be confused with the Wunderlich syndrom...
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Heterotopic pregnancy

Heterotopic pregnancy is a rare situation when there is an intra-uterine and extra-uterine (i.e. ectopic) pregnancy occurring simultaneously. Epidemiology The estimated incidence in the general population is estimated at 1:30,000 (for a naturally conceived pregnancy 7). The incidence among pat...
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Holoprosencephaly

Holoprosencephaly (HPE) is a rare congenital brain malformation resulting from incomplete separation of the two hemispheres. Classically three subtypes have been recognized, however additional entities are now included in the spectrum of the disease. The three main subtypes, in order of decreas...
Article

Hydatidiform mole

The hydatidiform moles are one of the most common but benign forms of gestational trophoblastic disease.  Epidemiology Hydatidiform moles are one of the common complications of gestation, estimated to occur in one of every 1,000-2,000 pregnancies 3. These moles can occur in a pregnant woman of...
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Hydranencephaly

Hydranencephaly is a rare encephalopathy that occurs in-utero. It is characterized by destruction of the cerebral hemispheres which are transformed into a membranous sac containing cerebrospinal fluid and the remnants of cortex and white matter 1. Porencephaly is considered a less severe degree...
Article

Hydrolethalus syndrome

Hydrolethalus syndrome is a rare lethal genetic syndrome characterized by multiple developmental defects of fetus which include  midline malformations cleft lip + / - palate CNS malformations fetal hydrocephalus agenesis of the corpus callosum Dandy-Walker malformation absent midline stru...
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Hydropic degeneration of the placenta

Hydropic degeneration of the placenta is a phenomenon where numerous cystic spaces are formed within the placenta which is often accompanied by placental enlargement. It can occur in a number of situations which include simple hydropic degeneration in 1st trimester pregnancy loss - fetal demise...
Article

Hydrops fetalis

Hydrops fetalis is excessive extravasation of fluid into the third space in a fetus which could be due to heart failure, volume overload, decreased oncotic pressure, or increased vascular permeability. Hydrops is defined as the accumulation of fluid +/- edema involving at least two fetal compone...
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Hypertelorism

Hypertelorism refers to an abnormal increase in distance between any two organs although some authors use the term synonymously with orbital hypertelorism meaning an abnormal increase in distance between the two eyes. The article mainly focuses on the latter. The abnormality is similar to teleca...
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Hypertensive states in pregnancy

There are several hypertensive states that can manifest in pregnancy. They include: gestational hypertension - pregnancy induced hypertension (PIH) pre eclampsia eclampsia  Epidemiology They may be commoner in young primigravid as well as older multiparous women. Pathology Associations a...
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Hypocoiled umbilical cord

A hypocoiled umbilical cord to an umbilical cord with less than normal coiling. This is normally estimated by a low umbilical cord coiling index (usually less than 0.2 2). Associations single umbilical artery abnormal cord insertion(s) See also non coiled umbilical cord
Article

Hypophosphatasia

Hypophosphatasia refers to a rare metabolic disorder characterized by deficient serum alkaline phosphatase activity. The effects of hypophosphatasia are primarily seen in the skeletal system. The condition has marked variation in clinical expression (see subtypes). Epidemiology The true incide...
Article

Hypoplastic nasal bone

Hypoplasia of the nasal bone refers to a sonographic observation where the fetal nasal bone appears smaller by varying degrees. There is a spectrum of nasal bone hypoplasia, at one end of which is the relatively easily identified absent nasal bone. The other end of the spectrum is considerably ...
Article

Hypotelorism

Hypotelorism refers to an abnormal decrease in distance between any two organs although some authors use the term synonymously with orbital hypotelorism meaning an abnormal decrease in the distance between the two eyes (the eyes appear too close together). The article mainly focuses on the latte...
Article

Hysterosalpingogram

Hysterosalpingogram (HSG) is a fluoroscopic examination of the uterus and the Fallopian tubes, most commonly used in the investigation of infertility or recurrent spontaneous abortions. Indications Infertility to assess uterine morphology and tubal patency. Contraindications pregnancy activ...
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Ian Donald

Ian Donald (1910-1987) was a Scottish obstetrician who pioneered the diagnostic use of ultrasound in medicine. Early life Ian Donald was born in Lisgeard, Cornwall, United Kingdom on 27th December 1910 6. His father was a general practitioner. In 1925 his family moved to South Africa where he ...
Article

Ileal atresia

Ileal atresia is a congenital abnormality where there is significant stenosis or complete absence of a portion of the ileum. There is an increased incidence in those with chromosomal abnormalities. This article will focus on ileal atresia alone but bear in mind that some cases correspond to jej...
Article

Incarcerated uterus

An incarcerated uterus or trapped uterus describes an extremely rare situation where a retroverted or retroflexed gravid uterus fails to ascend into the abdominal cavity. Epidemiology This is an uncommon presentation and is said to occur in 1 in 3000 pregnancies. Uncomplicated retroversion may...
Article

Incomplete miscarriage

Incomplete miscarriage is a term given to miscarriage where there are retained products of conception still within the uterus. Radiographic features Ultrasound Ultrasound appearance is variable, ranging from visible fetal parts to a mass of mixed echogenicity. The presence of a prominent vasc...
Article

Increased fetal abdominal circumference

Increased fetal abdominal circumference is usually given when the abdominal circumference lies above the 90th percentile. During the second and especially third trimesters an increased abdominal circumference usually contributes to a high estimated fetal weight (large for dates fetus), which has...
Article

Induced fetal demise

Induced fetal demise as the name suggests, refers to an iatrogenically-induced fetal demise, most often by injection of a pharmacologic agent. Indications selective or non-selective reduction of one of the fetuses in a multifetal pregnancy fetal demise is often induced before medical or surgi...
Article

Inevitable miscarriage

Inevitable miscarriage refers to the presence of an open internal os in the presence of bleeding in the first trimester of pregnancy. Most often the conception products are not expelled and intracervical contents are present at the time of examination. A sac may be seen low within the uterus and...
Article

Iniencephaly

Iniencephaly is a rare neural tube defect resulting in the following features 1,2: occipital bone defect partial or total absence (rachischisis)  of cervicothoracic vertebrae  fixed fetal head retroflexion Epidemiology The estimated incidence is at ~0.1-10 per 10,000 live births 5. There is...
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Interocular distance

The interocular distance (IOD) is a measurement between the two medial canthi of each eye. It is often measured as an accessory biometric parameter on routine antenatal ultrasound scans on the axial images. As a rule of thumb, the interorbital distance should be roughly equal to the ocular diame...
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Interstitial ectopic pregnancy

Interstitial ectopic pregnancy, also known as intramural ectopic pregnancy, is an important type of ectopic pregnancy with higher risks of rupture and hemorrhage compared to usual tubal ectopic pregnancies.  Terminology The term interstitial pregnancy is sometimes interchangeably used with cor...
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Interstitial line sign

The interstitial line sign is an ultrasound finding in interstitial ectopic pregnancy. It is an echogenic line from the mass to the endometrial echo complex. Reportedly it has high sensitivity (80%) and specificity (98%).
Article

Inter twin membrane

The intertwin membrane refers to a membraneous separation between two fetuses in a twin pregnancy. Depending on the chorionicity and amnionicity, the membrane may have a number of layers di-chorionic di-amniotic (DCDA) pregnancy composed of two chorionic and two amniotic layers usually has a...
Article

Intertwin membrane folding

Intertwin membrane folding is an observation where the intertwin membrane in a twin pregnancy appears as being folded. It is sometimes used as a predictor for the development of twin to twin transfusion syndrome. It occurs as a result of amniotic fluid discordance. Some reports suggest that fol...
Article

Intracranial cystic lesions in the perinatal period

Intracranial cystic lesions in the perinatal period can carry a relatively wide differential which includes: Supratentorial cystic lesions cysts arachnoid cyst choroid plexus cyst connatal cyst holoprosencephaly multicystic encephalomalacia periventricular leukomalacia porencephalic cys...
Article

Intracranial teratoma

Intracranial teratomas are uncommon intracranial neoplasms, which can have a bewildering variety of components and thus a wide range of appearances. They can be divided into two broad categories, intra- and extra-axial, which differ in epidemiology and clinical presentation. Another method of cl...
Article

Intradecidual sac sign

Intradecidual sac sign (IDSS) is a useful feature in identifying an early intrauterine pregnancy (IUP) as early as 25 days of gestation 1. The threshold level (earliest one can see the sign) is 24 days of gestation and the discriminatory level (one should always see the sac) is 47 days. As per t...
Article

Intramembranous ossification

Intramembranous ossification describes the process of ossification from mesenchymal cells (stem cells) without a cartilaginous template and is involved in the healing process of fractures. The stages of intramembranous ossification osteogenesis are as follows: mesenchymal cells differentiate in...
Article

Intrauterine blood clot

Intrauterine blood clot can result from a number of situations in gravid, non-gravid and postpartum states. It can mimic many other pathologies. Pathology Any condition that predisposes to an intrauterine hemorrhage can potentially result in an intrauterine blood clot. Radiographic features ...
Article

Intrauterine contraceptive device

Intrauterine contraceptive devices (IUCD) (also known colloquially as the coil) are one of the most frequently used methods of contraception throughout the world. It prevents pregnancy by: thinning the endometrial lining preventing sperm motility preventing implantation There are two main ty...
Article

Intrauterine gas

The presence of intrauterine gas can sometimes be inferred by tiny internal echoes on ultrasound, foci of very low attenuation at computed tomography (CT) or signal voids with susceptibility artifact at MRI. The term encompasses air within the uterine cavity as well as intramyometrial air. It c...
Article

Intrauterine growth restriction

Intrauterine growth restriction (IUGR) or fetal growth restriction (FGR)  is defined as an estimated fetal weight (EFW)/abdominal circumference (AC) at one point in time during pregnancy being below 3rd percentile or EFW/AC below the 10th percentile for gestational age with deranged Doppler para...
Article

Intrauterine membrane in pregnancy

An echogenic membrane might be seen within the uterus during pregnancy: membrane of maternal origin uterine septum amniotic shelf intrauterine synechiae membrane of fetal origin intertwin membrane amniotic band chorioamniotic separation chorioamniotic elevation fibrin strand
Article

In utero bowel perforation

In utero bowel perforation results in a chemical peritonitis (meconium peritonitis) from peritoneal leakage of sterile meconium. It can result from many causes which include: intestinal atresias: jejuno-ileal atresia ileal atresia anal atresia in utero intestinal ischemia underlying gastr...
Article

In utero Herpes simplex infection

In utero Herpes simplex infection usually occurs from transplacental tramission of the Herpes simplex virus. Transplacental intrauterine infection with herpes simplex virus is an extremely rare complication of primary herpes simplex in pregnancy. Epidemiology Fetal HSV infection much less comm...
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In utero infection

In utero infections, also known as congenital infections, can result from a vast number of etiological organisms and account for 2% to 3% of all congenital anomalies 4.  TORCH group: in utero toxoplasmosis infection / congenital toxoplasmosis infection: congenital cerebral toxoplasmosis othe...
Article

In utero syphilis infection

In utero syphilis infection, or congenital syphilis, results from transplacental transmission of the maternal infection from the spirochete Treponema pallidum, subspecies pallidum.  For a general discussion, and for links to other system specific manifestations, please refer to the article on s...
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In utero varicella zoster virus infection

An in utero varicella zoster virus infection is an infrequent type of in utero infection. The clinical features can be diverse and variable depending on the stage of gestation. Epidemiology Fetal infection with varicella is unusual in the current age due to most women of childbearing age being...
Article

Invasive mole

Invasive mole is a tumorous growth associated with gestation and falls under the spectrum of gestational trophoblastic disease. Due to their aggressive growth characteristics, invasive moles are considered locally invasive non-metastasizing neoplasms. Epidemiology An invasive mole develops in ...
Article

Irregular gestational sac

An irregular gestational sac as the name suggests is a gestational sac which does not have the well defined, regular borders of a normal gestational sac. It is an imaging feature related to a non-viable pregnancy. See also irregular yolk sac anembryonic pregnancy
Article

Irregular yolk sac

An irregular yolk sac or an abnormally shaped yolk sac is an imaging feature that can be observed in early pregnancy scanning. It may be seen in up to 17% of early pregnancy scans 1. In contrast to an irregular gestational sac, the observation of an irregular yolk sac in not thought to correlate...
Article

Isolated cleft palate

An isolated cleft palate is a type of facial cleft. This is a much rarer occurrence than a cleft lip +/- palate and is thought to represent a different pathological entity. Epidemiology The estimated incidence is at ~1 per 2000-2500 pregnancies 4-5. There may be a slight female predilection 4....
Article

Isolated inferior vermian hypoplasia

Isolated inferior vermian hypoplasia (IIVH), also referred as part of Dandy-Walker variant (DWV), is a congenital malformation characterized by partial absence of the inferior portion of the cerebellar vermis. Terminology The term Dandy-Walker variant was created to include those malformations...
Article

Isthmic ectopic pregnancy

An isthmic ectopic pregnancy is a sub type of tubal ectopic pregnancy an accounts for ~ 12% of such cases. According to one study the rate of tubal wall disruption was higher than with an ampullary ectopic pregnancy, suggesting that in an isthmic ectopic pregnancy, the trophoblast penetrates the...
Article

IUCD related uterine perforation

IUCD (intrauterine contraceptive device) related uterine perforations are one of the causes of uterine perforation. It is a rare, but serious complication of an IUCD, and is often clinically silent.  Epidemiology The incidence rate is reported at ~2 in 1000 2. Clinical presentation Perforati...
Article

Jarcho-Levin syndrome

The Jarcho-Levin syndrome (JLS) or spondylothoracic dysostosis is a rare autosomal recessive heterogeneous disorder that can occur with variable severity. Previously the condition spondylocostal dysostosis was also considered as part of the JLS spectrum but is now considered a distinct pathologi...
Article

Juberg-Hayward syndrome

Juberg-Hayward syndrome (JHS), also known as the oro-cranio-digital syndrome, is a rare autosomal recessive syndrome characterized by the association of the following:  growth retardation microcephaly cleft lip and palate minor vertebral and rib anomalies 4 horseshoe kidneys 4 thumb anomal...
Article

Kinked brainstem

Kinking of the brainstem is a rare finding in fetal or pediatric neuroimaging, invariably seen in association with other cerebral abnormalities. It generally heralds a poor neurological outcome. Clinical presentation A kinked brainstem may be seen on fetal MRI, commonly after referral from ult...
Article

Labeled imaging anatomy cases

This article lists a series of labeled imaging anatomy cases by system and modality. Brain CT head: non-contrast axial CT head: non-contrast coronal CT head: non-contrast sagittal CT head: angiogram axial CT head: angiogram coronal CT head: angiogram sagittal CT head: venogram axial CT ...
Article

Lambda sign (disambiguation)

There are a number of lambda signs: lambda sign of twin pregnancy lambda sign of sarcoidosis
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Large for dates uterus

A large for date uterus is a clinical observation based on uterine fundal height, which may result in referral for ultrasound assessment, usually in mid to late pregnancy. Pathology Etiology incorrect dates constitutionally large fetus multiple pregnancy fetal macrosomia polyhydramnios u...
Article

Large loop excision of the transformation zone

Large loop excision of the transformation zone (LLETZ) is a gynecological procedure. It is currently one of the most commonly used approaches to treat high grade cervical dysplasia - cervical intraepithelial neoplasia.
Article

Large yolk sac

A large yolk sac is one measuring >5-6 mm in pregnancies between a gestational age of 5-10 weeks. One study had shown that a yolk sac diameter of >5 mm can be associated with an increased risk of spontaneous miscarriage although few other authors have mentioned the existence of a very large yolk...
Article

Larsen syndrome

Larsen syndrome (LS) is an extremely rare disorder, often classified as a type of osteochondrodysplasia. Epidemiology The estimated incidence is thought to be at ~ 1 in 100,000 people. There may be an increased female predilection. Clinical presentation It is characterized by many features i...
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Left ventricular outflow tract view (fetal echocardiogram)

The left ventricular outflow tract (LVOT) view (or five chamber view) is one of the standard views in a fetal echocardiogram. It is a long axis view of the heart, highlighting the path from the left ventricle into the ascending aorta (left ventricle outflow tract). In this view the right ventr...
Article

Lemon sign

The lemon sign, noted on antenatal imaging, is one of the many notable fruit-inspired signs. It is a feature when there appears to be an indentation of the frontal bone (depicting that of a lemon). It is classically seen as a sign of a Chiari II malformation and also seen in the majority (90-98%...
Article

Lethal multiple pterygium syndrome

Lethal multiple pterygium syndrome (LMPS) is a lethal sub type of the multiple pterygium syndrome. Pathology It is primarily characterized by the presence of pterygia (or wings) present in two or more body areas overlying predominantly the large joints. Accompanying joint contractures are almo...
Article

Lethal omphalocele-cleft palate syndrome

Lethal omphalocele-cleft palate syndrome is, as the name suggests, characterized by the association of omphalocele and cleft palate.  Prevalence is assumed to be <1 per 1,000,000. It has been postulated that this syndrome is likely to be an autosomal recessive condition 1. History and etymolog...
Article

Lethal skeletal dysplasias

Lethal skeletal dysplasias form a heterogeneous group which are commonly characterized being non-survivable for prolonged periods ex-utero. They include: achondrogenesis atelosteogenesis campomelic dysplasia chondrodysplasia punctata: lethal variants  metatropic dysplasia: lethal variants 4...
Article

Limb body wall complex

The limb-body wall complex (LBWC) is a rare variable group of congenital limb and body wall defects (involving mainly the chest and abdomen). They can include: abdominoschisis: usually large and left-sided 4, and almost always present thoracic wall defect / thoracoschisis ectopia cordis anom...
Article

Lithopaedion

Lithopaedions, also referred as stone babies, are a rare phenomenon which occurs most commonly when a fetus dies during an ectopic pregnancy. Epidemiology The estimated incidence is at ~ 1.5 to 1.8% of abdominal ectopic pregnancies 4. Pathology If the deceased fetus is too large to be re-abs...
Article

Live ectopic pregnancy

A live ectopic pregnancy is an ectopic pregnancy where a live extrauterine fetus can be demonstrated.
Article

Loeys-Dietz syndrome

Loeys-Dietz syndrome is an autosomal dominant connective tissue disorder which has many features similar to Marfan syndrome. The disease is characterized by skeletal manifestations and vasculopathies. Although Loeys-Dietz syndrome shares many similarities with Marfan syndrome, the course is oft...
Article

Long philtrum

A long philtrum is a clinical or imaging observation where the philtrum (middle part of the upper lip) is longer than normal.  Pathology Associations It can be associated with a number of anomalies which include Aarskog syndrome Cornelia de Lange syndrome  DiGeorge syndrome femoral hypopl...
Article

Long umbilical cord

A long umbilical cord has been variably defined. Considering the mean length of the umbilical cord at ~50-70 cm 1, a long cord in absolute terms is usually taken as one that is over 70 cm in length at term 1-3.  Complications increased incidence of umbilical cord knots increased incidence of ...
Article

Lowe syndrome

Lowe syndrome, also known as the oculocerebrorenal syndrome of Lowe, is a multisystem disorder characterized by anomalies primarily affecting the eyes, nervous system, and kidneys. Epidemiology It is an extremely rare, pan-ethnic disease, with an estimated prevalence in the general population ...
Article

Low-lying placenta

Low-lying placenta occurs when the placenta extends into the lower uterine segment and its edge lies too close to the internal os of the cervix, without covering it. The term is usually applied when the placental edge is within 0.5-5.0 cm of the internal cervical os 1. Some alternatively give th...
Article

Low set ears

Low set ears is a descriptive term used to given a depressed or abnormally low positioning of the pinna by two or more standard deviations below the population average. Pathology Associations Low set ears can be associated with a number of anomalies which include: aneuploidic / chromosomal s...
Article

Macroglossia

Macroglossia means an enlarged tongue. It may be absolute (greater than the 95th centile) or relative (enlarged compared with oral cavity). Pathology Associations Recognized associations include: chromosomal anomalies Down syndrome tends to be a relative macroglossia may also have intermi...
Article

Marginal cord insertion

Marginal cord insertion, also known as a 'battledore insertion', is a type of abnormal cord insertion. Terminology Insertion of the umbilical cord within <2 cm from the placental margin is described as marginal cord insertion (usually defined as <2 cm 5 although some references define it as <1...
Article

Marginal placental abruption

Marginal placental abruption is the most common type of placental abruption wherein a hematoma is seen as the name suggests in the margin of the placenta and the blood collects below the chorionic membrane. It is most often seen in placentae that are partially implanted in the lower uterine segm...
Article

Marginal placenta previa

A marginal placental previa (or grade 2 placenta previa) is a form of placenta previa where placental tissue reaches the margin of the internal cervical os, but does not cover it.
Article

Marshall-Smith syndrome

Marshall-Smith syndrome (MSS) is a rare genetic syndrome primarily comprising the triad of facial dysmorphism, failure to thrive and accelerated osseous maturation 5. Many cases, however, have a wider clinical spectrum. Clinical presentation general fetal macrosomia failure to thrive skelet...
Article

Maternal hydronephrosis in pregnancy

Maternal hydronephrosis in pregnancy often results as a physiological phenomenon due to the presence of the fetus.  Epidemiology It is estimated that up to 90% of women have some degree of asymptomatic dilatation of the renal calyces, the renal pelves and the upper two-thirds of the ureters du...
Article

Maternal serum alpha fetoprotein (MSAFP)

Maternal serum alpha fetoprotein (MSAFP) is a screening test that examines the level of alpha fetoprotein (AFP) in a pregnant woman. AFP is produced by both the yolk sac and foetal liver during pregnancy. Indications Ideally, all pregnant women should undergo the screening test between 15-20 w...
Article

McKusick Kaufman syndrome

McKusick Kaufman syndrome (MKS) is an autosomal recessive multiple malformation syndrome primarily characterized by hydrometrocolpos - vaginal atresia post-axial polydactyly congenital heart disease
Article

Mean sac diameter

Mean sac diameter (MSD) is a sonographic measurement of the gestational sac which is usually first seen at around 3 weeks after conception (5 weeks after the last menstrual period), when it measures 2-3 mm. MSD = (length + height + width)/3 Normal MSD (in mm) + 30 = days of pregnancy Role of ...
Article

Meckel-Gruber syndrome

Meckel-Gruber syndrome (MGS) is classically characterized by the triad of: renal cystic dysplasia: multiple renal cysts (present most cases) occipital encephalocoele/holoprosencephaly (~70%) postaxial polydactyly: usually hexadactyly (~65%) Additional hepatic developmental defects and hepati...
Article

Meconium pseudocyst

Meconium pseudocyst formation is a complication that can occur with meconium peritonitis. Pathology It occurs when the extruded meconium becomes walled off within the peritoneal space. Radiographic features Plain radiograph May be seen as a rim calcified mass within the abdomen. Antenetal ...
Article

Megacystis microcolon intestinal hypoperistalsis syndrome

Megacystis microcolon intestinal hypoperistalsis syndrome (MMIHS) (also known as the Berdon syndrome) is a rare congenital disorder characterized by a dilated non-obstructive urinary bladder and hypoperistalsis of the gastrointestinal tract. Epidemiology There is recognized strong female predi...
Article

Megalencephaly

Megalencephaly (MEG) is a disorder characterized by an abnormally large brain. It is primarily a proliferative disorder of embryonic origin. It may involve all or part of the cerebral hemispheres and can be bilateral or unilateral. It is often associated with polymicrogyria or agyria.  Terminol...
Article

Mendelson syndrome

Mendelson syndrome or peptic pneumonia refers to acute chemical pneumonitis caused by the aspiration of stomach contents in patients under general anesthesia. Clinical presentation   This syndrome develops rapidly (2-12 hours after aspiration) and within hours the patient may become tachypnei...
Article

Mesoblastic nephroma

Mesoblastic nephroma, also sometimes known as a congenital mesoblastic nephroma (CMN) or fetal renal hamartoma, is, in general, a benign renal tumor that typically occurs in utero or in infancy. Epidemiology It is the commonest neonatal renal tumor. Diagnosis is usually made in the antenatal p...

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