Lymphangioma of the thymus in a child.

Computed tomographic (CT) evaluation of a rare thymic tumor in a child is described. The CT characteristics, pre- and postcontrast enhancement, are described and correlated with ultrasound and plain radiographic findings. Correlation is made between the CT results and the thymic lymphangioma with a subsequently identified abdominal lymphangioma.

Case report. Aortic aneurysm presenting as psoas enlargement.

We present a case of abdominal aortic aneurysm in which erosion and bleeding into the psoas muscle caused enlargement of that structure but remained confined within it until needle biopsy produced communication with the extraperitoneal space. This confirms the observation that separate compartmentalization of retrofascial and extraperitoneal spaces normally maintains.

Causes of intrahepatic shadowing on ultrasound examination.

Acoustic shadowing on ultrasound examination of the liver can be caused by both normal anatomical structures (ligamentum teres, walls of bile ducts and portal veins, interpositioned colon) as well as by abnormalities which may or may not be clinically important (air in the bile ducts, biliary calculi, calcified granulomas, foreign bodies). Acoustic shadowing is more frequently seen when high frequency transducers or lower gain at scanning are used.