Uterine dehiscence is, usually, used to refer to the process of gradual myometrial rupture without a rupture of membranes. However, the term is used synonymously with uterine rupture by some authors. It is often described in the context of C-section scar where it is also termed an incisional deh...
Uterine duplication anomalies are a group of Müllerian duct anomalies where fusion of the Müllerian duct associated structures fail to some degree:
uterus didelphys: class III
bicornuate uterus: class IV (second commonest duplication anomaly)
septate uterus: class V (commonest duplication ano...
Uterine enlargement can occur in a number of situations from both diffuse and focal processes. These include:
gestation related events
normal intrauterine pregnancy
molar pregnancy - gestational trophoblastic disease
postpartum uterus - still larger than usual
Uterine leiomyomas, also referred as uterine fibroids, are benign tumours of myometrial origin and are the most common solid benign uterine neoplasms. Commonly an incidental finding on imaging, they rarely cause a diagnostic dilemma. There are various medical, surgical and interventional treatme...
Uterine leiomyosarcomas are malignant uterine tumours that arises from the myometrium. The uterus is the commonest location for a leiomyosarcoma.
Typically present in women in the 6th decade. They account for up to one-third of uterine sarcomas but only ~8% of all uterine cancers ...
Uterine lipoleiomyomas result from degeneration of smooth muscle cells in an ordinary leiomyoma and represent a rare benign tumour of the uterus 1.
Lipoleiomyomas have a reported incidence of 0.03-0.20% and are typically found in postmenopausal patients with typical uterine leiomy...
Uterine lymphoma refers to involvement of the uterus with lymphoma. Some authors also place lymphoma of the uterine cervix under this group.
It is rare condition with initial uterine involvement occurring in only 1% of patients with lymphoma 3. However, uterine involvement is more...
Uterine perforation represents a serious complication that can occur as a result of any type of intrauterine procedure or implantation. Some authors use the term uterine rupture synonymously with the term uterine perforation.
IUCD insertion: IUCD related uterine perforation
Uterine rupture is a rare but nevertheless potentially catastrophic complication that can occur in pregnancy.
The incidence rate in pregnancy is at 0.05% 6.
Uterine rupture is usually an acute presentation with haemodynamic instability and abdominal disc...
Uterine sarcoma is a malignant uterine tumour thats is composed of part or all sarcomatous (mesodermal) elements. They however account for a minority of all uterine malignancies (1-6% 3-4).
They can be broadly classified as pure or mixed 4:
malignant mixed Mu...
Uterine smooth muscle tumours of uncertain malignant potential (STUMP) is a recently defined entity by the World Health Organisation for a heterogeneous group of uterine smooth muscle tumours that cannot be histologically diagnosed as unequivocally benign or malignant 1.
The uterine tube, also known as the Fallopian tube or less commonly the oviduct, is a paired hollow tube that bridges between each ovary and the uterus and functions to convey the mature ovum from the former to the latter. If conception occurs, it normally does so within the tube. It can be affe...
Uteroplacental blood flow assessment is an important part of fetal well-being assessment and evaluates Doppler flow in the uterine arteries and rarely the ovarian arteries.
In a non-gravid state and at the very start of pregnancy the flow in the uterine artery is of high pulsatility ...
The uterus is a hollow, thick-walled, muscular organ of the female reproductive tract that lies in the lesser pelvis.
The uterus has an inverted pear shape. In the adult, it measures about 7.5 cm in length, 5 cm wide at its upper part, and nearly 2.5 cm in thickness. It weighs ...
Uterus didelphys is a type of Müllerian duct anomaly (class III) where there is a complete duplication of uterine horns as well as duplication of the cervix, with no communication between them.
Didelphic uteri account for approximately ~8% (range 5-11%) of Müllerian duct anomali...
The uvea (also called the uveal layer or vascular tunic) is the middle three layers that make up the eye. It is the pigmented layer and its main function is of nutrition and gas exchange. It sits between the retina (innermost layer) and sclera.
It is traditionally split up into three anatomica...
Vacuum-assisted therapy, also known vacuum-assisted closure (VAC) or negative pressure wound therapy, refers to a device used in the treatment of acute or chronic wounds.
foam dressing applied on the wound
covering transparent adhesive membrane
vacuum source: VAC ...
VACTERL is an acronym that describes a non-random constellation of congenital anomalies. It is not a true syndrome as such and is equivalent to the VATER anomaly.
The estimated incidence is 1 in 10,000-40,000 births 3.
The acronym VACTERL derives from:
V: vertebral an...
The VACTERL-H association is a rare non-random association which bears the features of the standard VACTERL association with added fetal hydrocephalus.
Unlike the standard VACTERL association which is sporadic, the VACTERL-H is hereditary with both X-linked 3 and autosomal recessive 2 inheritan...
Vacuum phenomenon in the shoulder refers to the presence of intra-articular gas in the shoulder joint. It is a very common occurrence, particularly in external rotation. This can cause circular or linear areas of low signal intensity on GRE MR images of the shoulder obtained with external rotati...
A vagal nerve stimulator (VNS) is an implantable device used in patients with intractable epilepsy. It is considered to be an adjunctive therapy in the treatment of refractory seizure disorders.
The device is somewhat similar in appearance to a pacemaker with the 'box' typically inserted into t...
The vagina is a midline fibromuscular tubular structure positioned in the female perineum extending superiorly to the cervix and uterus in the pelvis.
The vagina is 8-10 cm in length, extending posterosuperior from the vestibule through the urogenital diaphragm to the uterus. Th...
The vaginal artery is a branch of the anterior division of the internal iliac artery, and should not to be mistaken with the vaginal branch of the uterine artery. It is often considered to be a homolog of the inferior vesical artery, which is present only in males.
origin: anterior div...
Vaginal atresia refers to a spectrum of anomalies comprising of failure to form a part or all of the vagina.
It is considered the second most common cause of primary amenorrhea. The estimated
Incidence is at ~ 2 in 10000 women.
The most common symptom...
The staging of primary vaginal cancer covers for all histological sub types and is as follows
FIGO staging system
stage 0: carcinoma in situ
stage I: tumour confined to vagina
stage II: invasion of paravaginal tissues but no extension beyond pelvic side walls
stage III: extension to pelvic ...
A vaginal leiomyoma is an extremely rare entity and falls under extra uterine pelvic leiomyomas.
They are extremely rare with only ~ 300 cases reported in literature 3.
It may occur anywhere along the vaginal canal and is usually localized, mobile, non-tender, and cir...
Vaginal lymphoma can refer to:
secondary involvement of the vagina (secondary vaginal lymphoma) from widespread generalised lymphoma
usually comprises of diffuse large cell B non-Hodgkin's lymphoma (DLBCL) 2
primary vaginal lymphoma
A vaginal pessary is a device inserted into the vagina which can either be mechanical or pharmaceutical.
A mechanical pessary is most commonly used to treat uterine prolapse. It is also used to treat stress urinary incontinence, a retroverted uterus, cystocoele and rectocoele. A bewildering arr...
Vaginal stenosis refers to a narrowing of the vagina, it can be congenital or acquired.
Acquired causes include
scarring from prior pelvic irradiation - brachytherapy
Depending on the site of stenosis and state of menstruation there can be a...
Vagoglossopharyngeal neuralgia is an uncommon presentation of glossopharyngeal neuralgia where the typical symptoms of pain are associated with cardiac symptoms including arrhythmias, asystole, and syncope.
It is believed to be due to complex interconnections between the nervus intermedius, the...
The vagus nerve is the tenth cranial nerve and provides the bulk of the parasympathetic input to the gastrointestinal system and to the heart. It is a complex mixed sensory, motor and parasympathetic nerve.
The vagus nerve arises as multiple rootlets at the ...
The valence shell of an atom is the outermost shell of the electron cloud. It plays a large part in determining the chemical, thermal, optical and
electrical properties of the element. This occurs because it often not
full and movement of electrons may occur between it and a) electrons
Valentino syndrome, or Valentino appendix, refers to a clinical syndrome of right lower quadrant or right iliac fossa pain secondary to a perforated peptic ulcer. It is an important differential diagnosis for acute appendicitis.
Although thought to be a very rare manifestation of ...
The terms valgus and varus refer to angulation (or bowing) within the shaft of a bone or at a joint.
It is determined by the distal part being more medial or lateral than it should be. Whenever the distal part is more lateral, it is called valgus. Whenever the distal part is more medial, it is ...
The Valsalva manoeuvre is the forced expiration of air against a closed airway, resulting in increased intra-abdominal, intrathoracic and pharyngeal pressure. It can be performed against a closed glottis or by one closing the mouth and pinching the nose while forcibly exhaling.
It is commonly u...
The valvulae conniventes, also known as Kerckring folds, plicae circulares or just small bowel folds, are the mucosal folds of the small intestine, starting from the second part of the duodenum, they are large and thick at the jejunum and considerably decrease in size distally in the ileum to di...
Valvular heart diseases, or cardiac valvulopathies, describe any acquired or congenital disease affecting one or more of the four cardiac valves.
This is a general index article that classifies cardiac valvulopathies depending on which valve(s) is affected 1. See individual articles for in-dept...
Van Buchem disease (VBD) is an extremely rare hereditary sclerosing bone dysplasia, also known as hyperostosis corticalis generalisata. This disease is characterised most notably by mandibular enlargement and thickening of the skull.
Less than 30 cases have been reported in the li...
The Vancouver classification of periprosthetic hip fractures proposed by Duncan and Masri is the most widely used classification system. It takes into account the fracture site, the status of the femoral implant, and the quality of surrounding femoral bone stock.
type A: fractures involve the t...
van der Woude syndrome (VWS) is characterized by the association of congenital lower lip fistulae / pits with cleft lip and / or palate.
It is one of the most common clefting syndromes in humans 1. VWS individuals have a high prevalence of hypodontia.
It carries anautoso...
Vanishing vertebrae is a rare ischaemic manifestation of sickle cell disease, in which a completely infarcted vertebral body literally disappears or vanishes, as a result of infarction. In the few reported cases, the posterior elements remain intact.
codfish or h-shaped vertebrae
Vanishing white matter disease (VWM), also known as childhood ataxia with central hypomyelination (CACH), is an exceedingly rare entity only fully described in 1997, but due to its name sometimes over-represented in differentials for white matter disease.
Most cases are encountere...
Variably protease sensitive prionopathy (VPSPr) is a very rare type of sporadic human prion disease that was first described in 2008.
Clinical presentation is varied, but most patients demonstrate a combination of:
progressive neuropsychiatric features: dementia and psyc...
Variant anatomy of the aortic arch occurs when there is failure of normal aortic development. It results in a number of heterogenous anomalies of the aorta and its branch vessels.
Normally, the aorta ascends in the superior mediastinum to the level of the sternal notch before arc...
Variation in hepatic arterial anatomy is seen in 40-45% of people. Classic branching of the common hepatic artery from the coeliac artery, and the proper hepatic artery into right and left hepatic arteries to supply the entire liver, is seen in 55-60% of the population.
In general, the common ...
There can be several variations with cord insertion into the placenta:
central insertion (~90%): normal situation
eccentric cord insertion: lateral insertion of the umbilical cord >2 cm from the placental margin
term sometimes used synonymously with marginal cord insertion
marginal cord inse...
There can be many variations in fetal presentation which is determined by which part of the fetus is projecting towards the internal cervical os. This includes:
cephalic presentation: fetal head presenting towards the internal cervical os, considered normal and occurs in the vast majority of b...
There can be several variations in placental morphology. These include:
single lobed discoid placenta (single disc): most common scenario
bilobed placenta: two near equal size lobes
succenturiate lobe(s): one of more smaller accessory lobes
circumvallate placenta: rolled placental edges with...
Varicella pneumonia is a type of viral pneumonia. It is a common cause of multiple small round calcific lung lesions. Varicella-zoster virus (VZV) most commonly causes self-limited benign disease (chickenpox) in children. However, in adults it tends to cause significant complications such as VZV...
Varicella zoster virus (VZV) encephalitis can be due to either an immune reaction to primary infection or reactivation of latent infection in cranial nerve or dorsal root ganglia following childhood chickenpox.
Manifestations following primary infection include:
Varicocoele is the dilatation of the pampiniform plexus of veins, a network of many small veins found in the male spermatic cord. It is the most frequently encountered mass of the spermatic cord.
The estimated incidence is at ~15% of general male population and ~40% of subfertile ...
Varicocoele embolisation is a minimally invasive method of treating varicoceles by embolising the testicular vein (internal spermatic veins).
failed surgical ligation
Relative contraindications include:
Varicocoele grading on colour Doppler can be done variably. The most elaborate and widely-accepted grading was given by Sarteschi, as below.
For a general discussion of this condition refer to the article: varicocoele.
baseline grey scale study in supine position and measure the d...
Varicose bronchiectasis refers to a morphological sub type of bronchiectasis. According to one study, this type as a pure form accounted for ~10% of all bronchiectasis 1. In this form there are intermittent narrowed and dilated segment to the affected bronchus when viewed in long axis and can gi...
Varicose veins are dilated tortuous superficially located venous channels that accompany the superficial veins of the upper or lower limbs.
Varicose veins are more common in women than men and are more common in the lower limb than in the upper limb 5. Risk factors include:
Vasa praevia is a term given when there are abnormal fetal vessels within the amniotic membranes that either cross or run in extremely close proximity to the internal cervical os.
Vasa previa can be of two types
type I (present in ~ 90% of cases with vasa praevia 3): abnormal fetal ...
The VASARI (Visually AcceSAble Rembrandt Images) MRI feature set is a system designed to enable consistent description of gliomas using a set of defined visual features and controlled vocabulary. It is the result of work by The Cancer Imaging Archive (TCIA) who publish relevant guides to use, an...
Vascular anatomical variants are common.
SVC & IVC - variants
Intracranial arteries - variants
Vascular calcifications in the breast are calcifications associated with blood vessels.
They are most often seen in post menopausal women with arteriosclerotic heart disease.
Results due to calcified atherosclerotic plaques in the arterial walls.
Vascular compression disorders are numerous and can be divided into those cases where a vascular structure is the "compress-er" or the "compress-ee" . Some conditions fall into both categories, where one vessel compresses another.
Compression of a vascular structure
Vascular dementia, also known as vascular cognitive impairment, is the second most common cause of dementia after the far more common Alzheimer disease. It is primarily seen in patients with atherosclerosis and chronic hypertension and results from the accumulation of multiple white matter or co...
Vascular Ehlers-Danlos syndrome (EDS) or type IV Ehlers-Danlos syndrome (EDS 4) is the most malignant form of Ehlers-Danlos syndrome. This form is often accompanied by neurovascular complications secondary to vessel dissections and/or aneurysms.
Vascular EDS represents about 4% of...
Vascular malformations and tumours are a heterogeneous group of lesions that may affect the arterial, capillary, venous or lymphatic system or any combination thereof. They encompass a bewildering range of lesions, syndromes, and masses ranging from the relatively common (e.g. infantile hemangi...
Vascular pathologies are common and include:
inherited disorders of the vessel wall
tumours of blood vessels
congenital vascular anomal...
Vascular pedicle is bordered on the right by venous structures (right brachiocephalic vein above and superior vena cava) and on the left by an arterial structure (the left subclavian artery origin). The azygos vein (black oval) is seen en face above the right main bronchus.
The vascular pedicle...
Vascular rings and slings refer to the congenital vascular encirclement of the oesophagus and/or trachea by anomalous/aberrant vessels.
Vascular rings are rare, occurring in <1% of patients 1. No gender or ethnic predispositions have been identified 3.
The are numerous vascular syndromes that can occur in the body. There include
Syndromes principally involving the vascular system
coeliac artery compression syndrome
hereditary haemorrhagic telangiectasia (Osler-Weber-Rendu syndrome)
hypothenar hammer syndrome
thoracic aortic injury
renal pedicle injury
Vasculitis describes generalised inflammation of vessels. Vasculitides carry a broad range of clinical presentations and as a whole can involve almost any organ system.
Some vasculitides are due to direct vessel injury from an infectious agent. However a large proportion show evidenc...
Vasculopathies caused by varicella zoster virus (VZV) represent a group of illness involving both small and large CNS arteries caused by a inflammatory process involving the media and the vascular endothelium, usually in immunocompromised individuals due the viral reactivation and spread thought...
Vasitis is an uncommon inflammatory disorder of the vas deferens and spermatic cord. It is classified as either the generally asymptomatic vasitis nodosa (seen after vasectomy) or acutely painful infectious vasitis 1. This article refers to the acute infective form as imaging is generally not un...
Vasogenic cerebral oedema refers to a type of cerebral oedema in which the blood brain barrier (BBB) is disrupted (cf. cytotoxic cerebral oedema, where the BBB is intact). It is an extracellular oedema which mainly affects the white matter via leakage of fluid from capillaries.
It is most frequ...
The vastus intermedius muscle is one of the 4 quadriceps muscles in the anterior compartment of the thigh. The others are the vastus medialis, the vests laterals, and the rectus femoris.
origin: upper two thirds of the anterior and lateral surfaces of the femur
The vastus lateralis is largest of the four quadriceps muscles in the anterior compartment of the thigh. The others are the rectus femoris, the vastus intermedius, and the vastus medialis.
lateral part of intertrochanteric line
margin of greater trochanter
The vastus medialis muscle is one of the four quadriceps muscles in the anterior compartment of the thigh. The others are the rectus femoris, the vastus intermedius, and the vastus lateralis.
medial part of intertrochanteric line
medial lip of the linea ...
VATER (equivalent to VACTERL) is the non-random constellation of a number of congenital anomalies.
V : vertebral anomalies
A : anal atresia
TE : tracheo-oesophageal fistulas
R : radial ray hypoplasia, polydactyly and renal agenesis
The prevalence of at least 3/5 anomalies oc...
There are many signs in radiology which are vegetable- and plant-inspired, they include:
celery stalk anterior cruciate ligament: ACL mucoid degeneration
celery stalk metaphysis: osteopathia striata and congenital rubella infection
Christmas tree intestinal atresia
The veiled right kidney sign is a sonographic sign described in pneumoretroperitoneum, most commonly due to duodenal perforation.
It refers to the appearance of the right kidney on transabdominal ultrasound 1-4. On ultrasound, there is difficulty in obtaining images of the right kidney due to i...
The vein of Galen, also known as the great cerebral vein or great vein of Galen, is a short trunk formed by the union of the two internal cerebral veins and basal veins of Rosenthal. It lies in the quadrigeminal cistern. It curves backward and upward around the posterior border of the splenium o...
Vein of Galen aneurysmal malformations (VGAMs), probably better termed as median prosencephalic arteriovenous fistulas, are uncommon intracranial anomalies that tend to present dramatically during early childhood with features of a left-to-right shunt and high-output cardiac failure.
The vein of Labbé, also known as inferior anastomotic vein, is part of the superficial venous system of the brain.
The vein of Labbé is the largest channel that crosses the temporal lobe between the Sylvian fissure and the transverse sinus and connects the superficial middle cerebral vein to t...
The vein of Marshall, oblique vein of Marshall or the oblique vein of the left atrium is a small vein that descends on and drains the posterior wall of the left atrium. It drains directly into the coronary sinus at the same end as the great cardiac vein, marking the origin of the sinus.
Veins of Sappey are small veins around the falciform ligament that drain the venous blood from the anterior part of the abdominal wall directly into the liver. This flow dilutes the portal perfusion at these sites, causing hepatic pseudolesions.
The superior vein of Sappey drains...
Velamentous cord insertion is one of the types of abnormal umbilical cord insertion into the placenta.
The estimated incidence is ~1% in singleton and 9-15% in twin pregnancies, respectively 11. It is also more common in placenta previa than in normally located placentas. The prev...
The velum interpositum is a small membrane containing a potential space just above and anterior to the pineal gland which can become enlarged to form a cavum velum interpositum.
The velum interpositum is formed by an invagination of pia mater forming a triangular membrane the ap...
Vena cava filter is an endovascular device which is typically placed in the infrarenal inferior vena cava (IVC) to prevent pulmonary embolism in selected patients. This procedure is most often performed by interventional radiologists under fluoroscopic guidance.
The vena caval foramen is one of the three major apertures in the diaphragm. It is the highest of the three and situated at the level of T8-9. It is quadrilateral and placed at the junction of the right and middle leaflets of the central tendon.
It transmits several structures between the thora...
The venae cordis minimae (smallest cardiac veins or thebesian veins) are a small group of valveless myocardial coronary veins within the walls of each of the 4 cardiac chambers that drain venous blood directly into each of the respective chambers. They are most frequent in the right atrium and t...
The venous distension sign is a finding that may be identified on sagittal imaging of the dural venous sinuses which is said to have a diagnostic sensitivity and specificity of 94% for intracranial hypotension. The sign is positive when there is a convex inferior margin of the midportion of the ...
The venous drainage of the thoracic wall drains deoxygenated venous blood from the peripheries of the thoracic cage back into systemic circulation.
Anterior thoracic wall
Anterior intercostal veins
The anterior intercostal veins originate from the intercostal space just inferio...
Venous thromboembolism covers a wide spectrum of diseases. Individual conditions and complicating condition include:
deep vein thrombosis (DVT)
pulmonary embolism (PE)
dural venous sinus thrombosis
Venous vascular malformations of the facial nerve, previously known as facial nerve haemangiomas, are rare benign vascular malformations of the facial nerve usually presenting as a facial nerve palsy, which can be rapid onset mimicking a Bell palsy.
As they do not appear to have c...
Ventilator-associated pneumonia (VAP) is a form of hospital acquired pneumonia (considered the commonest form 3).
It is sometimes defined as as a pneumonia occurring more than 48 hours after patients have been intubated and received mechanical ventilation 5.
It is usually suspected when the pa...