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Article
August 1985

Epidermotropic Metastatic Squamous Cell CarcinomaReport of Two Cases Showing Histologic Continuity Between Epidermis and Metastasis

Author Affiliations

From the Departments of Pathology (Dr Weidner) and Pathology/Dermatology (Dr Foucar), University of Iowa Hospitals and Clinics, Iowa City. Dr Weidner is now with the Bowman Gray School of Medicine, Winston-Salem, NC.

Arch Dermatol. 1985;121(8):1041-1043. doi:10.1001/archderm.1985.01660080095023
Abstract

• Two unusual cases of squamous cell carcinoma (SCCa) metastatic to skin from distant sites occurred. In both metastatic sites, the malignant squamous epithelium fused with benign surface epithelium, and the resulting transition simulated that typically seen in primary cutaneous SCCa. We believe that this previously unreported phenomenon is an expression of the natural tendency of squamous epithelium to "heal" denuded connective tissue surfaces by proliferation followed by epithelial fusion. Because epithelial continuity can be established between benign keratinocytes and metastatic SCCa, one cannot rely on this single morphologic finding to separate primary from metastatic disease.

(Arch Dermatol 1985;121:1041-1043)

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