title: Capillary anastomosis in vena caval thrombosis.
abstract: A 29-year-old woman presented with recurrent diffuse histiocytic lymphoma. Bilateral brachial venous catheters were placed for chemotherapy, which resulted in thrombotic occlusion of the superior vena cava. A lung scan with Tc-99m MAA (flow study and static images) demonstrated extensive collateral vessels in the upper thorax and trapping of particles in the right upper abdomen, anteriorly. A simultaneous liver scan with Tc-99m sulfur colloid (flow and delayed images) illustrated a normal liver with no other abnormal sites of tracer deposition. The accumulation of a lung imaging agent in the anterior abdominal wall was secondary to capillary anastomosis between the superior and inferior epigastric veins.
mesh_terms: D000328:Adult; D003097:Collateral Circulation; D005260:Female; D006801:Humans; D011877:Radionuclide Imaging; D013927:Thrombosis / Q000000981:diagnostic imaging / Q000503:physiopathology*; D014683:Vena Cava, Superior