Case of seborrheic keratosis with underlying basal cell carcinoma suggesting a collision tumor

Authors

  • Hyunjoong Jee,

    1. Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
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  • Noo Ri Lee,

    1. Department of Dermatology, Institute of Lifestyle Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
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  • Sung Ku Ahn

    Corresponding author
    1. Department of Dermatology, Institute of Lifestyle Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
    • Department of Dermatology and Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
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Correspondence: Sung Ku Ahn, M.D., Ph.D., Department of Dermatology and Institute of Lifestyle Medicine, Yonsei University Wonju College of Medicine, 162 Ilsan-Dong, Wonju 220-701, Korea. Email: ahnsk@yonsei.ac.kr

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.

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