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Endobronchial minute leiomyoma in a patient with malignant lymphoma.

lung biopsy revealed diffuse large B-cell type malignant lymphoma of the lung. In addition, during evaluation of the pulmonary invasion of lymphoma, a round, translucent polypoid tumor, measuring 3 by 3 mm, with a smooth surface was found in the right middle lobe bronchus (Fig. 1). The polypoid tumor was easily extirpated by transbronchial biopsy (TBB), and was found to be leiomyoma (Fig. 2A, B). No relation between the leiomyoma and malignant lymphoma was suggested by the histopathological findings. Moreover, we could not find a primary lesion or metastases in any other organs. Benign tumor of the lung is rare, and leiomyomas make up approximately only 2 % of benign lung tumors (1). Pulmonary leiomyoma is considered to consist of either endotracheal/endobronchial or intraparenchymal lesions. The latter appears as solitary or multiple nodules, for example, benign metastasizing leiomyoma from uterine origin, on chest X-ray films and CT. In contrast, endotracheal/endobronchial lesions appear as polypoid masses that protrude intralumenally and have wide bases (2). Endotracheal/endobronchial minute lesions can be treated by bronchoscopic biopsy. However, there are few reports of recurring leiomyoma, and careful follow-up is needed (3, 4).