Malignant Solitary Fibrous Tumor of the Diaphragmatic Peritoneum Report of a Case

Takeo Fujita, Yasushi Ohmura*, Tomoya Takao*, Hideyuki Nishi*, Kazuma Fukuda*, Masayuki Mano*, Syokichi Komatsubara*, Hiroyoshi Doihara, Nobuyoshi Shimizu and Kouji Taguchi**

Department of Cancer and Thoracic Surgery, Graduate School of Medicine and Dentistry, Okayama University
Department of Surgery, Okayama Rosai Hospital^*
Department of Pathology, Okayama Rosai Hospital^**

A 80-year-old woman admitted for hypochondoralgia was found in abdominal computed tomography to have a heterogenous mass 9 cm in diameter in the right hepatic lobe. Surgery was conducted for a suspected mesenchymal tumor arising from the abdominal wall or originating in the liver. Operative findings showed that the tumor originated in the diaphragm. We resected the tumor. Histologically, the tumor consisted of spindle and pleomorphic cells. Mitotic cells were seen 8/10 HPF, and atypical mitosis was sporadically present. Immunohistochemical testing was positive for CD34, vimentin, and glycogen, and negative for S-100 and desmin, identifying the tumor as a malignant solitary fibrous tumor of the diaphragmatic peritoneum. Eight months post operatively, the patient is doing well, without evidence of recurrence.

Key words
solitary fibrous tumor, diaphragm, malignant diaphragmatic tumor

Reprint requests
Takeo Fujita Department of Cancer and Thoracic Surgery, Graduate School of Medicine and Dentistry, Okayama University
2-5-1 Shikata-cho, Okayama, 700-8558 JAPAN

Accepted
March 24, 2004

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