, 6patients With intrathoracic metastases of malignant melanoma were treated in our hospitals , Three of the 6 patients had intfalumina ] tumors detected by bronchoscopy . At bronchoscopy , all 3 patients had white tumors without any pigmentation , and 20f them had dark brown pigmentation on mucosa around the tumors while l of them did not . Pathological examination of primary lesions revealed melanotic malignant melanoma in all 3 patients. However , pathologica !examination of the

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... stases revealed melanoticmalignantmelanomain 2 patients and amelanoticmalignant melanoma in l patient. These findings indicate that the presence of pigmentation on mucosa around turnors, not on