Giant myxoid neurofibroma of the hip causing bone erosion: a case report

Myxoid neurofibroma (MN) is a rare tumor originating from the nerve sheet.It commonly occurs as a solitary cutaneous or subcutaneous mass within 5 cm of diameter; deep-seated lesions are extremely rare, unless they are associated to neurofibromatosis. We report a case of a deep-seated, sporadic, giant MN of the hip causing bone erosion. The patient was asymptomatic, being the diagnosis incidental. A soft tissue sarcoma was initially suspected on imaging basis, and the diagnosis of MN was finally carried out with a core specimen biopsy. Due to its unusual features, a total hip prosthesis is planned in order to obtain complete excision of the mass.