Bizarre parosteal osteochondromatous proliferation of the temporal bone: A case report

Bizarre parosteal osteochondromatous proliferation (BPOP), or Nora's lesion, is a rare benign surface bone lesion typically arising in the hands and feet. We report an unusual case involving the temporal bone in a 63-year-old woman, presenting with progressive external auditory canal obstruction and hearing-related symptoms. Imaging revealed a well-circumscribed osseous mass without corticomedullary continuity, and surgical excision with canaloplasty led to complete symptom resolution. This case expands the recognized anatomical spectrum of Bizarre parosteal osteochondromatous proliferation (BPOP) and underscores the importance of including it in the differential diagnosis of surface bone lesions in the craniofacial region, where even benign processes may result in significant functional impairment due to local anatomy.