Splenic Infarct
KEY FACTS Imaging • Variable sonographic appearance of acute splenic infarction ○ Classic – Hypoechoic, peripheral, wedge-shaped, and avascular ○ Nonclassic – Rounded or peripheral band morphology – Global infarction…
Column of Bertin, Kidney
KEY FACTS Terminology • Hypertrophic band of normal cortical tissue that separates pyramids of renal medulla Imaging • Band of tissue isoechoic to cortex and continuous with renal cortex, extending…
Choledochal Cyst
KEY FACTS Terminology • Spectrum of extrahepatic and intrahepatic bile ducts malformations characterized by fusiform dilatation Imaging • Todani classification ○ Type I: Solitary fusiform or cystic dilatation of common…
Acute Cholangitis
KEY FACTS Terminology • Inflammation of intra-/extrahepatic bile duct walls due to ductal obstruction and infection Imaging • Dilatation of intra- and extrahepatic bile ducts ○ In cases of early…
Splenomegaly
KEY FACTS Imaging • No universal consensus on splenomegaly (SMG) cut off due to variability in normal adult spleen size • SMG is diagnosed when length > 13 cm; additional…
Echogenic Bile
KEY FACTS Imaging • Amorphous, mid-/high-level echoes within gallbladder or bile ducts • Free floating or mass-like, mobile, settling in dependent position • Floating punctate echoes may show ring-down artifact…
Biliary Ductal Gas
KEY FACTS Terminology • Definition: Gas within biliary tree, including bile ducts or gallbladder • Synonyms: Pneumobilia, aerobilia Imaging • Bright, echogenic foci in linear/branching configuration following portal triads associated…
Gallbladder Polyp
KEY FACTS Imaging • Single or multiple small, round/ovoid masses attached to gallbladder (GB) wall with no posterior acoustic shadowing ○ Usually sessile but may be pedunculated with well-defined stalk…
HIV-/AIDS-Related Cholangiopathy
KEY FACTS Terminology • Secondary sclerosing cholangitis usually resulting from opportunistic infection of biliary tract in AIDS patients with CD4 count < 100/mm³ Imaging • Knowledge of HIV/AIDS status is…
