title: The first case of huge amebic intra-abdominal tumor with asymptomatic amebic colitis.
abstract: We report a rare case of huge amebic intra-abdominal tumor with asymptomatic amebic colitis. This appears to represent the first report of amebic intra-abdominal tumor. A 31-year-old woman presented to a local doctor with only a sensation of abdominal fullness. Abdominal computed tomography (CT) showed a huge intra-abdominal tumor in the left abdominal cavity, and she was referred to our hospital. Colonofiberscopy for detailed examination showed multiple slight, discrete ulcers in the cecum. Ameboid trophozoites were identified from biopsy specimens, and asymptomatic amebic colitis was diagnosed. Oral metronidazole (MTZ) was administered at 1500 mg/day for 10 days. CT 14 days after starting MTZ showed no change in the intra-abdominal tumor, and resection of the tumor was therefore performed. Pathological examination revealed Entamoeba histolytica with engulfed erythrocytes complicated by hemorrhagic cyst. If an intra-abdominal tumor is present and colitis is observed, amebic intra-abdominal tumor should be considered among the differential diagnoses.
authors.affiliation: Department of Emergency and Critical Care, Tokai University Hachioji Hospital, 1838 Ishikawa-machi, Hachioji Tokyo, 192-0032 Japan.
authors.forename: Shigeo
authors.initials: S
authors.lastname: Higami
authors.affiliation: Department of Gastroenterological and General Surgery, Tokai University Hachioji Hospital, 1838 Ishikawa-machi, Hachioji Tokyo, 192-0032 Japan.
authors.forename: Eiji
authors.initials: E
authors.lastname: Nomura
authors.affiliation: Department of Gastroenterological and General Surgery, Tokai University Hachioji Hospital, 1838 Ishikawa-machi, Hachioji Tokyo, 192-0032 Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Yamazaki
authors.affiliation: Department of Emergency and Critical Care Medicine, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa 259-1193 Japan.
authors.forename: Seiji
authors.initials: S
authors.lastname: Morita
authors.affiliation: Department of Emergency and Critical Care, Tokai University Hachioji Hospital, 1838 Ishikawa-machi, Hachioji Tokyo, 192-0032 Japan.
authors.forename: Wataru
authors.initials: W
authors.lastname: Noguchi
authors.affiliation: Department of Gastroenterological and General Surgery, Tokai University Hachioji Hospital, 1838 Ishikawa-machi, Hachioji Tokyo, 192-0032 Japan.
authors.forename: Shuji
authors.initials: S
authors.lastname: Uda
authors.affiliation: Department of Gastroenterological and General Surgery, Tokai University Hachioji Hospital, 1838 Ishikawa-machi, Hachioji Tokyo, 192-0032 Japan.
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Hara
authors.affiliation: Department of Gastroenterological and General Surgery, Tokai University Hachioji Hospital, 1838 Ishikawa-machi, Hachioji Tokyo, 192-0032 Japan.
authors.forename: Soichiro
authors.initials: S
authors.lastname: Yamamoto
authors.affiliation: Department of Gastroenterological and General Surgery, Tokai University Hachioji Hospital, 1838 Ishikawa-machi, Hachioji Tokyo, 192-0032 Japan.
authors.forename: Sayuri
authors.initials: S
authors.lastname: Hasegawa
authors.affiliation: Department of Gastroenterological and General Surgery, Tokai University Hachioji Hospital, 1838 Ishikawa-machi, Hachioji Tokyo, 192-0032 Japan.
authors.forename: Kosuke
authors.initials: K
authors.lastname: Tobita
authors.affiliation: Department of Pathology, Tokai University Hachioji Hospital, 1838 Ishikawa-machi, Hachioji Tokyo, 192-0032 Japan.
authors.forename: Takuma
authors.initials: T
authors.lastname: Tajiri
authors.affiliation: Department of Gastroenterological and General Surgery, Tokai University Hachioji Hospital, 1838 Ishikawa-machi, Hachioji Tokyo, 192-0032 Japan.
authors.forename: Masaya
authors.initials: M
authors.lastname: Mukai
authors.affiliation: Department of Emergency and Critical Care Medicine, Tokai University School of Medicine, 143 Shimokasuya, Isehara, Kanagawa 259-1193 Japan.
authors.forename: Sadaki
authors.initials: S
authors.lastname: Inokuchi
authors.affiliation: Department of Gastroenterological and General Surgery, Tokai University Hachioji Hospital, 1838 Ishikawa-machi, Hachioji Tokyo, 192-0032 Japan.
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Makuuchi
keywords: Amebic colitis; Entamoeba histolytica; Intra-abdominal tumor