Abstract
We report the case of a patient with recurrent malignant solitary fibrous tumor (SFT) in the abdominal cavity who underwent for the recurrent tumor three times over a period of 11 years after the first resection. An 87-year-old woman who was admitted to our hospital for depression complained of abdominal fullness. She had undergone resection for extrapleural SFT at 77, 80 and 83 years of age. Abdominal CT showed a large mass in the abdominal cavity extending from the pelvis to the upper abdomen. CT angiography demonstrated the feeding arteries for the tumor arising from the internal iliac arteries and inferior gastric arteries of both sides. We performed resection of the tumor under the diagnosis of recurrent extrapleural SFT. The resected specimen was 29 × 27 × 9 cm in size and weighed 1900 g. The cut-surface showed an en-capsulated solid mass with hemorrhagic and necrotic areas. Histopathological examination revealed fibroblast-like cells in a patternless arrangement, with mitotic figures in 4/10 high-power fields. Immunuhistochemistry revealed positive staining of the neoplastic cells for CD34, Bcl-2, MIB-1 and STAT6. The histopathological findings closely resembled the findings of the previously resected recurrent SFTs. The patient survived for more than 11 years despite developing SFT recurrence three times.
Malignant extrapleural SFT shows a high potential for recurrence, and patients with this tumor should be carefully followed up for long periods of time.
