Items tagged “rg_39_7_edit”
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Twin pregnancies are the most common multifetal pregnancies. Epidemiology Multifetal pregnancies account for ~1% of all pregnancies but are seen in much higher numbers in populations where in vitro fertilisation (IVF) is a common practice. Classification A twin pregnancy can be broadly cate...
Primary sclerosing cholangitis
Primary sclerosing cholangitis (PSC) is an uncommon inflammatory condition that affects the biliary tree resulting in multiple strictures, liver damage, and eventually cirrhosis. The diagnosis can be made when there are classical imaging features in the correct clinical context, and secondary c...
Monochorionic diamniotic twin pregnancy
A monochorionic diamniotic (MCDA) twin pregnancy is a subtype of monozygotic twin pregnancy. These fetuses share a single chorionic sac but have two amniotic sacs and two yolk sacs. Epidemiology It accounts for the vast majority (70-75%) of monozygotic twin pregnancies although only ~30% of a...
Monochorionic twin pregnancy
A monochorionic twin pregnancy is a type of monozygotic twin pregnancy where the twins share a single chorion. Depending on the sharing of the amnion this can be divided into two types. monochorionic monoamniotic (MCMA) pregnancy: single amnion monochorionic diamniotic (MCDA) pregnancy: two am...
Superficial perineal pouch
The superficial perineal pouch is an anatomic space below the perineal membrane in the urogenital triangle of the perineum. Gross anatomy The superficial perineal pouch is inferior (superficial) to the perineal membrane in the urogenital triangle, anterior to the transverse line between the is...
ACR Thyroid Imaging Reporting and Data System (ACR TI-RADS)
ACR TI-RADS is a reporting system for thyroid nodules on ultrasound proposed by the American College of Radiology (ACR) 1. This uses a standardized scoring system for reports providing users with recommendations for when to use fine needle aspiration (FNA) or ultrasound follow-up of suspicious ...