Langerhans' cell granulomatosis (histiocytosis X) of bone in adults.

Langerhans' cell granulomatosis (LCG) (histiocytosis X) of bone is generally considered a childhood disease. A series of 61 adult patients who presented with histologically confirmed skeletal disease was studied. The male-to-female ratio was 2.1, and 36 patients were more than 30 years old, the oldest being 71 years. Pain was the most frequent symptom. Forty-six patients has solitary lesions, six had two or three, and nine had more than three. The time interval between the development of lesions, although usually less than 2 years, ranged up to 32 years. Rib, skull, and pelvis were the most frequently involved sites. Eight patients had extraskeletal disease. Radiologically, a well-defined lytic lesion, either with no surrounding reaction or with sclerotic margins, was seen most often. The rare, poorly defined lesions tended to occur in the clavicle. Microscopically, typical Langerhans' cells were present in large numbers. Eosinophils were usually prominent. Benign giant cells, mitotic figures, and necrosis also were observed. There was no histologic difference between solitary and multiple lesions. Surgery, radiation therapy, or a combination of both usually provided adequate treatment. Only two of the solitary lesions recurred. Eleven patients suffered from chronic, progressive disease, which inconsistently responded to treatment. None of the patients in our series died of the disease.