Abstract
An autopsied case of a 12 year-old boy with small cell carcinoma (intermediate cell type) was reported. He was admitted with a complaint of cough, and chest X-ray on admission revealed scattered nodular shadows in both lung fields. A diagnosis of small cell carcinoma of the lung was made by transbronchial biopsy after he had been treated by anti-tuberculous agents for 3 months. He died 11 months later after treatment with a combination of COMP and ACNU. Primary lung cancer in children is extremely rare, and only 18 cases, including this case, were reported from 1953 in Japan.