Mastocytosis as an unusual cause of hip fracture in an elderly woman.

Mastocytosis is a type of myeloproliferative neoplasm characterized by accumulation and proliferation of morphologically and immunophenotypically abnormal mast cells in 1 or more organ systems. Clinical manifestations vary depending upon the organ involved and chemical mediators released by mast cells along with constitutional symptoms and musculoskeletal complaints. We report a case of isolated bone marrow mastocytosis in an 87-year-old woman who presented with a fall resulting in proximal femur fracture. Bone marrow biopsy revealed mastocytosis, and no evidence of systemic involvement or peripheral mastocytosis was found. Physicians should be aware of this entity, especially in patients with osteoporosis.