[Tuberculosis of the cavum].

An elderly woman had a history of hemimandibulectomy for mandibular ameloblastoma performed 24 years earlier. In the last follow-up visit, an excrescent and ulcerative lesion was detected in the posterior wall of the cavum, below and medial to Rosenmüller's fossa, with clamps of enlarged, consistent cervical lymph nodes that was more marked on the right side. Cavum biopsy and needle biopsy of the lymph nodes revealed tuberculosis. This diagnosis usually is incidental and the differential diagnosis includes tumoral and granulomatous processes. Biopsy of the cavum is important for regional lesions with cervical lymph node enlargement.