Oncogenic Osteoblastoma: A Rare Clinical Entity in the PNS Arising from Ethmoidal Sinus

Oncogenic osteoblastoma is a rare clinical entity in the peripheral nervous system (PNS). Its presentation is like a nasal polyp. One should keep the diagnosis of oncogenic osteoblastoma in mind as a differential diagnosis for mass in nasal cavity. Excessive bleeding during surgery should arouse the suspicion and the pathologist has to be sounded. A preliminary biopsy of the mass is to be considered. Immunohistochemistry (IHC) should be done, if the suspicion is strong.