Symptomless cyst formation at the location of a biloma resolved with a single aspiration: case report.

A biloma is an encapsulated bile collection outside the biliary tree. The underlying causes include iatrogenic, traumatic, and spontaneous injury of the biliary tree. Its diagnosis is based upon clinical history, imaging studies, and needle aspiration with chemical analysis of the fluid. Biloma usually presents as a simple or septated cyst or a cyst with internal contents. The symptomatic biloma if left untreated may result in significant morbidity and even mortality. In past reports, the mainstay of management relied on bile flow diversion and/or bile drainage to achieve elimination of bile as well as complete resolution of the cyst. We report on a 58-year-old woman with a 9.0 x 5.4 cm cyst between the right liver and the upper role of the kidney after wedge resection for a hepatoma in the right lobe. She suffered from abdominal pain and fever. A single percutaneous needle aspiration with chemical analysis confirmed the diagnosis of biloma and relieved her symptoms. The biloma vanished immediately. However, a recurrent symptomless cyst was detected at the same site 6 months later. Its content was proven to be clear transudate, and it was left untreated. If a biloma has no communication with the biliary tree, and the proximal biliary tree has neither stricture nor stones, percutaneous aspiration alone may achieve resolution.