MRI and FDG PET/CT findings of malignant fibrous histiocytoma of the prostate.

Malignant fibrous histiocytoma primarily arising from the prostate is extremely rare. A 43-year-old man presented with dysuria for 12 months. Serum prostate-specific antigen level was normal. T2-weighted MR images showed a well-circumscribed tumor with inhomogeneous intensity in the prostate. The patient underwent transurethral resection of the prostate. Prostate malignant fibrous histiocytoma was histopathologically confirmed. FDG PET/CT was performed showing extremely high FDG uptake of the tumor with SUVmax of 46.8.