Malignant solitary fibrous tumor of the thigh accompanied by hypoglycemic coma. A case report.

A case of malignant solitary fibrous tumor of the thigh with liver and lung metastasis, suspicious of non-islet cell tumor-associated hypoglycemia is reported. The patient, a 76-year-old woman, was initially aware of an increasing soft tissue tumor in the left thigh, and episodes of hypoglycemia gradually developed. These frequent episodes ceased after resection of the thigh tumor, which was diagnosed as malignant solitary fibrous tumor. Considering that (i) the primary lesion developed in a rare site, (ii) the tumor was a malignant variant (accompanied by liver and lung metastasis), and (iii) the lesion was accompanied by typical hypoglycemic episodes, this case seemed to be extremely rare.