Small intestinal bleeding, secondary to metastatic malignant fibrous histiocytoma of the rib: report of a case.

Malignant fibrous histiocytoma (MFH) is an aggressive bone tumor with a high propensity for metastasis. We describe herein the case of a 73-year-old man found to have MFH of the rib with a metastasis in the small intestine. The patient complained of gastrointestinal bleeding as the first symptom. Computed tomography imaging demonstrated a tumor in the left chest wall, and abdominal magnetic resonance imaging revealed thickening of the wall in the internal cavity of the small intestine. Histopathological and immunohistochemical examination confirmed that the tumor in the small intestine was an MFH that had metastasized from the rib.