Extrapleural Solitary Fibrous Tumor of Foot: A Case Report

Yuko Kobashi*, Yohei Munetomo, Akira Baba, Shinji Yamazoe and Takuji Mogami

Extrapleural Solitary Fibrous Tumor of Foot: A Case Report.

Extrapleural Solitary fibrous tumor is a rare soft tissue tumor originating
from mesenchymal cells. Extrapleural SFT shows no gender predilection, affecting people across a wide age range, from 5 to 92 years.

Extrapleural SFT is usually a benign, slow-growing tumor, but a malignant behavior has also been reported. Although Extrapleural SFTs most commonly occur in the pleura, numerous extrapleural sites of involvement have been reported. We describe a rare case of an Extrapleural SFT in the plantar area of the left foot.

A 77-year-old woman was admitted to our hospital for a mass lesion in the plantar area of the left foot. However, the patient recently complained of pain in the sole of her foot after long distance walking.

Foot X-rays showed marked pressure erosions in the second and third metarsal bones due to a compression by the mass. Toes of the left foot showed osteopenic change suggestive of osteoporosis. On foot CT, a low density tumor measuring 10 cm in diameter was present in the plantar area.

The calcaneus showed erosive changes which sclerotic margin for the long-lasting compression by the
tumor. The deformity of the metatarsal bones showed the same Computed Tomographic finding as the one of the calcaneus.

Despite the tumor compression, the first to third metatarsal and the calcaneus bones showed no bone marrow edema. Considering patient clinical history and presentation and MRI findings, we initially suspected a fibroproliferative neoplasm like an aggressive fibromatosis.

Radiol Open J. 2016; 1(2): 35-38. doi: 10.17140/ROJ-1-106