Temporal Bone Osteomyelitis Masquerading as Malignancy: A Diagnostic Challenge.

Xanthogranulomatous osteomyelitis is a rare chronic inflammatory disorder. Until now, it has only been reported in long bones. To the best of our knowledge, it has never been reported in temporal bone. We present the case of this rare disease in a 64-year-old male involving the temporal bone, presenting with ear pain, discharge, decreased hearing, and granulation tissue in the external auditory canal, mimicking malignancy clinically and radiologically. The patient was unresponsive to medical management and was taken up for surgical debridement, followed by treatment with systemic and topical antibiotics, with a successful outcome. As this disease has not been reported in the literature yet in the temporal bone and mimics malignancy, it must be differentiated on histopathology to establish a definite diagnosis and provide appropriate management. A long-term follow-up is also necessary to recognize the clinical behavior of this disease, as no treatment protocol has been established yet.