Acute Pyelonephritis
KEY FACTS Imaging • Findings of acute pyelonephritis (AP) are almost always asymmetric • Renal enlargement with loss of corticomedullary differentiation • Geographic areas of altered echogenicity • Urothelial thickening…
Renal Junctional Line
KEY FACTS Terminology • Definition ○ Defect or line representing incomplete embryologic fusion of 2 primary renal lobes: Upper and lower poles of kidney • Synonyms ○ Junctional parenchymal defect…
Renal Artery Stenosis
KEY FACTS Terminology • Hemodynamically significant narrowing of renal artery (RA) Imaging • Poststenotic “jet” and turbulent flow on color Doppler ○ Abnormally high peak systolic velocity with angle-corrected spectral…
Tuberculosis, Urinary Tract
KEY FACTS Terminology • Urinary tract infection by mycobacterium tuberculosis via hematogenous spread from primary focus, usually lungs Imaging • Depends on stage of disease; may range from caliectasis, abscess,…
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…
