Perigraft seroma diagnosed by echocardiography: a complication following Blalock-Taussig shunt.

Perigraft seroma is a specific clinicopathologic entity, which is a collection of clear, sterile fluid, confined within a nonsecretory fibrous pseudomembrane surrounding a vascular graft. Serous leaks and/or seroma formation from polytetrafluoroethylene grafts have been reported in peripheral arteriovenous anastomoses, arterial grafts and subclavian pulmonary anastomoses. We present a case of seroma formation which developed after a Blalock-Taussig shunt operation constructed with a polytetrafluoroethylene graft in a child with tricuspid atresia and which was diagnosed by echocardiography.