Osteoma of the temporal bone squama: a case report and review of literature

Abstract

Background Osteomas are benign slow-growing tumors, which typically arise on the surface of the bone. They rarely arise from the temporal bone, accounting for 0.1–1% of all benign tumors of the skull. The external auditory canal (EAC) is the most common site for osteomas in the temporal bone. Other extra-canalicular osteomas of the temporal bone are uncommon and infrequently reported. In this case report, we discuss the clinical presentation and surgical management of osteoma of the squamous part of the temporal bone. A limited review of literature is also presented. Case presentation A 20-year-old male presented to the outpatient department (OPD) with a chief complaint of a hard swelling above his left ear, for 4 years. He had no other complaints other than cosmetic concern. On examination, there was a solitary, smooth, bony hard swelling just antero-superior to the left pinna, and the overlying skin was unremarkable. The left EAC and tympanic membrane were normal. A non-contrast computed tomography (CT) scan of the head and face with 3-D reconstruction showed a16 × 18 mm exophytic, pedunculated bony lesion arising from the squamous part of the temporal bone suggestive of an osteoma. The patient was taken up for surgical excision under general anesthesia. The bony lesion was removed from its attachment to the skull using a gouge and a mallet. The base of the tumor was drilled using a polishing burr to ensure complete removal and prevent recurrence. The histopathology was confirmatory of compact osteoma. Postoperative period was uneventful, and follow-up at 18-month post-surgery did not reveal any recurrence clinically. Conclusion Osteoma of the temporal squama is rarely reported, and surgical excision is the definitive treatment if symptomatic. This case report highlights the surgical management of this rare tumor. A limited review of literature suggests that squamous part of the temporal bone is an unusual site for extra-canalicular osteomas, and the prognosis is good after surgery.