title: An unusual second primary tumor. Report of a case of atypical carcinoid of the lung.
abstract: This case report presents a rare occurrence of two primary tumors in the same patient: a transitional cell carcinoma of the bladder and an atypical carcinoid of the lung. The time interval between a linear density and tumor growth to 3 cm, determined by chest radiographs, was 9 months. The rapidly growing pulmonary nodule was suspected to be a metastasis from the primary transitional cell carcinoma. Fine-needle aspiration revealed malignant cells. Lobectomy and light and electron microscopy revealed an atypical carcinoid. The definition of "atypical" requires revision to indicate this tumor's true potential.
mesh_terms: D002276:Carcinoid Tumor / Q000473:pathology*; D002295:Carcinoma, Transitional Cell / Q000473:pathology; D006801:Humans; D008168:Lung / Q000473:pathology; D008175:Lung Neoplasms / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D001749:Urinary Bladder Neoplasms / Q000473:pathology