Items tagged “stubs”

34 results found
Article

Linear attenuation coefficient

Linear attenuation coefficent (µ) is a constant that describes the the fraction of attenuated incident photons in a monoenergetic beam per unit thickness of a material. Its complement is the transmitted portion of the beam. It is expressed numerically in units of cm-1. Calculating µ The intens...
Article

Widow's peak hair anomaly

Widow's peak hair anomaly refers to a frontal hairline projection. Epidemiology Associations Aarskog syndrome Opitz syndrome Waardenburg syndrome frontonasal dysplasia craniofrontonasal dysplasia Clinical presentation Prominent V-shaped hairline projection. Ocular hypertelorism might be...
Article

X-linked Opitz G/BBB syndrome

X-linked Opitz G/BBB syndrome (XLOS) is an x-linked disorder with a spectrum of congenital anomalies. Anomalies that may be seen are: facial anomalies  ocular hypertelorism prominent forehead widow's peak broad nasal bridge anteverted nares cleft lip and/or palate  laryngotracheoesophage...
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

Preplacental abruption

Preplacental abruption or hemorrhage can be subamniotic or subchorionic in location. Clinical presentation vaginal bleeding most often painless Symptoms may be similar to placental abruption in other locations, however, it may not have as poor a prognosis as other forms of placental abruptio...
Article

Expanded amnion sign

The expanded amnion sign has been described as a poor prognostic sign in early pregnancy, suspicious though not diagnostic of failed early pregnancy. Any visible embryo that is surrounded by an amnion (visible on transvaginal ultrasound) should also have a heartbeat, regardless of crown-rump len...
Article

Triple screening

Triple screening refers to a screening blood test that is used to screen pregnant women for possible neural tube defects, Down syndrome and trisomy 18 in the developing fetus. It measures: alpha-fetoprotein Beta hCG unconjugated estriol Interpretation An abnormal test result doesn't indica...
Article

Fetal maceration

Fetal maceration is one of the signs of fetal death. It is a destructive aseptic process that appears between 12 to 24 hours after fetal death. It may not be seen in a pregnancy earlier than 6 months. In this a separation of the skin from head and trunk occurs giving a bubble-like appearance.
Article

Pseudo-omphalocele

Pseudo-omphalocele is a spurious sonographic appearance giving an impression of an anterior abdominal wall defect. Radiographic features Antenatal ultrasound Pseudo-omphalocele may be seen in: scanning errors where there is a deformation of the fetal abdomen by transducer pressure and the im...
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

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

Lingula (lung)

The lingula is a combined term for the two lingular bronchopulmonary segments of the left upper lobe: superior lingular segment inferior lingular segment The two lingular segments are the most anterior of the segments in the left upper lobe lying below the apicoposterior and anterior segments...
Article

Right lower lobe superior segment

The right lower lobe superior or apical segment is one of the five bronchopulmonary segments of the right lower lobe. It is the most apical of the segments in the right lower lobe, posteroinferior to the upper aspect of the oblique fissure and posterior segment of the right upper lobe. Related ...
Article

Right lower lobe posterior segment

The right lower lobe posterior or posterior basal segment is one of the five bronchopulmonary segments of the right lower lobe. It is the most inferoposterior of the segments in the right lower lobe, below the superior segment. Related pathology Due to its low and posterior position, pathology...
Article

Left lower lobe posterior segment

The left lower lobe posterior or posterior basal segment is one of the four bronchopulmonary segments of the left lower lobe. It is the most inferoposterior of the segments in the left lower lobe, below the superior segment. Related pathology Due to its low and posterior position, pathology in...
Article

Right lower lobe lateral segment

The right lower lobe lateral or lateral basal segment is one of the five bronchopulmonary segments of the right lower lobe. It is the most inferolateral of the segments in the right lower lobe, below the superior segment.
Article

Left lower lobe lateral segment

The left lower lobe lateral or lateral basal segment is one of the four bronchopulmonary segments of the left lower lobe. It is the most inferolateral of the segments in the left lower lobe, below the superior segment.
Article

Right lower lobe anterior segment

The right lower lobe anterior or anterior basal segment is one of the five bronchopulmonary segments of the right lower lobe. It is the most inferoanterior of the segments in the right lower lobe. Together with the medial segment, it is analogous to the left lower lobe anteromedial segment.
Article

Right lower lobe medial segment

The right lower lobe medial or medial basal segment is one of the five bronchopulmonary segments of the right lower lobe. It is the most inferomedial of the segments in the right lower lobe. Together with the anterior segment, it is analogous to the left lower lobe anteromedial segment.
Article

Left upper lobe superior lingular segment

The left upper lobe superior lingular segment is one of the four bronchopulmonary segments of the left upper lobe. It lies below the apicoposterior and anterior segments of the left upper lobe.

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