Non-Hodgkin's lymphoma primarily involving the bronchial tree.

Among extranodal localizations, the bronchial one is very unusual, especially as primary involvement. The authors present 2 cases of non-Hodgkin's lymphoma (NHL) admitted to the hospital because of thoracic abnormalities. Chest x-ray revealed lobar atelectasis. Fiberoptic bronchoscopic findings agreed with the diagnosis of unresectable bronchogenic tumor in both cases. Histologic examination of biopsy specimens was nonrevealing in the first patient, and suggested small cell lung cancer in the second one. Further histologic and immunohistochemical examinations excluded bronchial tumors (particularly small cell bronchogenic carcinoma) and led to the diagnosis of lymphocytic lymphoma in one case and centroblastic lymphoma in the other. In the differential diagnosis of bronchogenic tumors, it is necessary to keep in mind the hypothesis of lymphomatous involvement of the bronchial wall, although it rarely occurs.