-Case Reports-

Intracystic Hemorrhage of a Large Simple Hepatic Cyst

Goro Takahashi, Hiroshi Yoshida, Yoshihiro Mamada, Nobuhiko Taniai, Koichi Bando and Takashi Tajiri

Surgery for Organ Function and Biological Regulation, Graduate School of Medicine, Nippon Medical School

Spontaneous intracystic hemorrhage rarely occurs in nonparasitic hepatic cysts. We describe a patient with spontaneous intracystic hemorrhage of a large simple hepatic cyst that mimicked a malignancy. A 59-year-old man presented with right abdominal discomfort. The patient's medical history included a simple hepatic cyst that had been detected 7 years earlier but was left untreated. Three weeks before presentation, right upper abdominal pain occurred but resolved spontaneously. The serum CA19-9 concentration was 48.3 U/mL (normal<37 U/mL). Ultrasonography revealed a large cystic mass, containing many hyperechoic structures and occupying nearly the entire right hepatic lobe. Computed tomography demonstrated a homogenous low-density area, 20 cm in diameter, in the right hepatic lobe. Magnetic resonance imaging revealed a heterogeneous hypointense lesion measuring 20 cm in diameter. The lesions showed linear hyperintense areas on T1-weighted sequences and mosaic heterogeneous hyperintensity on T2-weighted sequences. We suspected a hemorrhagic simple hepatic cyst, hydatid cyst, or hemorrhagic cystadenocarcinoma. Right hepatectomy was performed, and the enlarged right lobe was removed. The mass was soft, sponge-like, and contained fluid, but was not elevated. Pathologic examination of the surgical specimen confirmed the presence of a hemorrhagic benign hepatic cyst.

J Nippon Med Sch 2008; 75: 302-305

Keywords
intracystic hemorrhage, hepatic cyst

Correspondence to
Hiroshi Yoshida, MD, Department of Surgery, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8603, Japan
hiroshiy@nms.ac.jp

Received, May 13, 2008
Accepted, June 12, 2008