Collateralization of the palmar arch by a failing radiocephalic fistula: an underappreciated complication of Cimino fistula anatomy.

Stenosis at the anastomosis of an arteriovenous dialysis fistula can cause fistula failure due to venous thrombosis. Three cases are presented in which anastomotic stenosis in radiocephalic fistulas resulted in radial artery occlusion with collateralization of ulnar artery flow across the palmar arch. Hand ischemia did not occur, and reductions in fistula efficiency were clinically subtle. Urea kinetics were compromised, and a characteristic palmar bruit was heard.

Spiral CT during arterial portography.

Spiral computed tomography (CT) performed during arterial portography offers several advantages compared with portographic studies based on conventional CT technique. Because all hepatic images are derived from a volume data set acquired during a single 24-32-second breath hold timed to coincide with the phase of peak hepatic enhancement, motion artifacts and section misregistration are eliminated and high liver-to-lesion attenuation value differences are present on all sections. These factors, in conjunction with the ability to retrospectively acquire thin, overlapping axial sections, result in improved lesion detection. The ability to produce high vein-to-liver attenuation value differences and two-dimensional multiplanar reconstructions simplifies the identification of hepatic segments and therefore lesion localization. A limitation of all CT portographic methods is the frequent occurrence of nontumorous perfusion defects that, in most cases, demonstrate characteristic locations and appearances. Performing delayed CT following portography is one method by which such pseudolesions may be characterized and differentiated from focal pathologic entities.

Embolization of a renal transplant pseudoaneurysm following angiolipoma resection. A case report.

The development of a pseudoaneurysm in renal allografts is a well-known complication of percutaneous biopsy. However, the authors report a case of pseudoaneurysm formation in a renal cadaver allograft, following documented angiolipoma resection prior to transplantation. Treatment required superselective embolization with multiple platinum coils.

Magnetic resonance characteristics of the LGM vena cava filter: technical note.

The LGM (Vena Tech) IVC filter is a recently introduced device for caval interruption. The magnetic resonance imaging safety and imaging characteristics of this filter were evaluated. The filter was proven to lack ferromagnetic properties. It was imaged with minimal artifact and no detectable motion in the magnetic field.

Cystic artery pseudoaneurysm: a rare cause of hemobilia.

Gallstone-induced cystic artery pseudoaneurysm is a rarely encountered cause of hemobilia. A few reports have appeared in the radiologic literature. We report such a case as a reminder of its uncommon occurrence.