title: Case of seborrheic keratosis with underlying basal cell carcinoma suggesting a collision tumor.
abstract: Reports of seborrheic keratosis (SK) with concurrent malignant tumors are rare, but previous and recent reports - especially the co-manifestation of basal cell carcinomas (BCC) have added to the ongoing debate of the possibility of the development of BCC from SK. We report a rare case of SK with underlying BCC with scarcely accounted histopathological characteristics - reticulated type and nodular type, respectively - that showed no direct histological link between the two entities. We also carefully suggest that differences in histopathology (whether the two lesions are connected or not) may account for the possibility of incidental co-habitation.
authors: Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea.
authors: Hyunjoong
authors: H
authors: Jee
authors: Noo Ri
authors: NR
authors: Lee
authors: Sung Ku
authors: SK
authors: Ahn
mesh_terms: D000368:Aged; D002280:Basal Cell Carcinoma / Q000150:complications* / Q000473:pathology; D006801:Humans; D017492:Keratosis, Seborrheic / Q000150:complications* / Q000473:pathology; D008297:Male; D012867:Skin / Q000473:pathology; D012878:Skin Neoplasms / Q000150:complications* / Q000473:pathology
keywords: basal cell carcinoma; co-manifestation; collision tumor; malignant transformation; seborrheic keratosis