Diagnosis of pulmonary adenocarcinoma due to hip bone metastasis.

specific, and the differential diagnosis should include pulmonary tuberculosis, sarcoidosis, histiocytosis X, tumorlets and pulmonary metastases. The definitive diagnosis is established by lung biopsy. In small samples it is particularly difficult to differentiate it from papillary adenoma. The natural history is not clear, but it is unlikely for it to degenerate to malignancy, and the clinical evolution is good although there have been reported episodes of death due to respiratory failure.3,5,6