It is reported about the BCG-osteomyelitis in early childhood. A long intervall between BCG-vaccination and the onset of clinical symptoms, the good general condition of the patient, nearly unrestricted joint function, often negative bacteriological culture for the tubercle bacillus and negative guinea-pig test are characteristics. Even with extensive lesions of the epiphysis and metaphysis of the long bone and formation of an abscess, the course of the disease seems to be fairly benign. Operation is recommended for getting biopsy material for histological proof of the tuberculous process and for quicker healing.