We performed a clinicopathological study involving 1,227 lesions of basal cell carcinoma (BCC) diagnosed at the Sapporo Institute for Dermatopathology. Based upon the clinical and histopathological findings, we divided the lesions into five categories: nodular, superficial, morpheic, fibroepithe-liomatous, and infundibulocystic. The male: female ratio was 1:1.26, and the average age at resection was 70.1±13.9 years. The lesions were most frequently located on the face (69.1%). In distribution, 77.3% of the lesions were nodular type, 9.8%, superficial type, 9.7%, morpheic type, 2.1%, fibroepitheliomatous type, and 2.0%, infundibulocystic type. The average age at resection of the morpheic type (72.7±12.0 years), was significantly older than that of the nodular and superficial types. On the face, 83.3% the of lesions were nodular. On the trunk and extremities, 50% of the lesions were nodular type, and 35% were superficial type. The nodular, morpheic and infundibulocystic types of lesions were located most frequently on the face, but, those of the superficial and fibroepitheliomatous types, on the trunk. Half of the nodular type lesions were clinically diagnosed as BCC. The superficial type were diagnosed as BCC in 51.3% of the cases and as Bowen’s disease in 20.5%. Ten cases had a total of 24 multiple lesions.
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