Signet ring squamous cell carcinoma-the forgotten variant: case report and review of the literature
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Squamous cell carcinoma is one of the commonest skin cancers. In most instances, histological diagnosis is straightforward and does not pose any diagnostic challenge to the handling pathologist. We report a rare case of signet ring squamous cell carcinoma (SRSCC) occurring in an 84-year-old woman who presented with a sore on the upper lip. Excision of the lesion showed signet ring carcinoma within a scar and surface ulceration. Deeper sections showed focal area of squamous differentiation. Although rare, consideration of squamous cell carcinoma as a diagnosis of primary skin tumors with signet ring morphology, especially in the absence of history of adenocarcinoma, may prevent missing rare cases of SRSCCs.
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