Tuberculosis is a chronic infectious granulomatous disease caused by Mycobacterium tuberculosis and less frequently by Mycobacterium bovis. Although pulmonary lesions are usual, those of extrapulmonary tuberculosis have reportedly increased. 1-6 However, primary tuberculous osteomyelitis of the mandible is extremely rare. [4][5][6] We present a case of a 3-year-old boy with primary tuberculous osteomyelitis of the mandible. He complained of a left submandibular mass. Radiographic examination revealed osteolytic lesions in the left mandibular angle, the left scapula and the left ulna. A biopsy from the mandible showed non-caseating epithelial granuloma. The mandibular mass spontaneously regressed in a month without definitive diagnosis. Swelling of the bilateral mandibular body was found 2 years later. He was diagnosed as having tuberculous osteomyelitis by culture study and treated with isoniazid and rifampicin without recurrence. Here we stress the importance of considering tuberculous osteomyelitis in the differential diagnosis of jaw lesions to prevent serious systemic spread.
Case reportA 3-year-old Japanese boy was admitted to a local hospital with a complaint of a bean-sized subcutaneous mass in the neck. Microscopic examination of the resected subcutaneous mass showed non-caseating epithelioid cell granulomas without definitive diagnosis. Ziehl-Neelsen staining for mycobacterium and culturing of this material were not performed. He developed swelling of the left mandible 1 month later, and was administered antibiotics including ampicillin-sulbactam, cefmetazole, aspoxicillin, ceftizoxime and minocycline without improvement.He was then referred to Niigata University Medical & Dental Hospital for further evaluation. He did not have underlying primary immune deficiency. It was established that Bacillus Calmette Guerin vaccination had been given at the age of 3 months and there had been no contact with tuberculosis patients. In his family there was no history of tuberculosis either. At presentation, a firm, non-tender and immovable mass measuring 5 cm in diameter was observed in the left mandiblar angle. A thumb-sized submandibular lymph node was also found. Hepatosplenomegaly was not found. Radiographic study revealed irregular osteolytic findings in the left mandibular angle. Osteolytic lesions were also found in the left scapula and the proximal metaphysis of the left ulna. Sclerotic change was found in the left orbital bone. Chest roentgenography revealed no findings suggestive of tuberculosis. Computed tomography revealed bone destruction and new bone formation in the left ramus (Fig. 1). A technetium ( 99m TcMDP) scan showed increased activity in the left mandibular bone, left scapula, left proximal ulna, and bilateral pelvis (Fig. 2). A gallium ( 67 Ga) scan showed increased activity only in the left mandibular bone. Laboratory findings showed white blood cell count of 9400/mm 3 , red blood cell count of 485 × 10 4 /mm 3 , hemoglobin of 9.7 g/dL, hematocrit of 31.6%, platelet count of 44.2 × 10 4 /mm 3 ...