Overview Javascript code is used to roll images, open new browser window and detect browser type. This Javascript code is not necessary to use the site. The cause is unknown. People 30 to 40 years old are affected most often.
Cigarette smoking is a risk factor for pulmonary histiocytosis.
Spontaneous pneumothorax occurs frequently in this condition. Histiocytosis occurs in about 1 out of 10,000 people. Histiocytosis may also be manifest in childhood. The skull is a frequent site of involvement. Tumors in the weight bearing bones such as the legs or spine may fracture spontaneously.