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Vol.43 No.6 contents

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- Case Report -

Three Cases of Collision Cancer of Squamous Cell Carcinoma and Adenocarcinoma

Shigeki Sawada¹, Shigeharu Moriyama¹, Youichi Watanabe², Masatoshi Kubo¹, Shuji Ichihara¹, Keiju Aokage¹
Department of ¹Surgery, ²Pulmonary Medicine, Okayama Red Cross Hospital, Japan

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Background. Primary pulmonary collision tumor is relatively rare. We report three cases of primary pulmonary collision cancer. Case. Case 1 was a 67-year-old man in whom an abnormal shadow, a tumor 2 cm in diameter in the right S¹⁰, was found on a chest X-ray film and bronchofiberscopic cytology showed squamous cell carcinoma of the lung. Right lower lobectomy was performed and the pathologic diagnosis showed collision cancer of adenocarcinoma and squamous cell carcinoma. Case 2 was a 77-year-old man. His chest X-ray film and CT showed a tumor in the right S⁶. Right lower lobectomy was performed and pathologic diagnosis showed collision cancer of adenocarcinoma and squamous cell carcinoma. Case 3 was a 75-year-old woman in whom chest X-ray film and CT showed a tumor 2.7 cm in diameter in the right S². Biopsy via bronchofiberscopy showed squamous cell carcinoma. After right upper lobectomy, pathologic diagnosis showed collision cancer of adenocarcinoma and squamous cell carcinoma. Conclusion. These three cases were all collision tumors involving adenocarcinoma and squamous cell carcinoma which is the most common combination in lung cancer.
key words: Collision cancer, Lung cancer, Adenocarcinoma, Squamous cell carcinoma

Received: March 31, 2003
Accepted: September 1, 2003

JJLC 43 (6): 739-744, 2003