Mucinous sweat gland adenocarcinoma of eyelid.A clinicopathologic study of 21 cases with histochemical and electron microscopic observations

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Abstract
This is a clinicopathologic study of 21 cases of mucinous sweat gland adenocarcinoma involving the eyelid. The tumor occurred in middle‐aged adults (median age 60 years) and has a predilection for males. In this series eight patients (40%) had one or more local recurrences, one of whom died with extensive local invasion of the face after multiple recurrences in a 15‐year interval. Only one patient had metastasis to the submandibular lymph nodes, which was treated by radical neck dissection. Involvement of the head, especially the face and scalp, was observed in 78% of the cases from the literature. Combining our cases with those previously reported, we found that the eyelid was involved in almost half of the cases (21 out of 45 lesions). We believe that the identification by light microscopy of a mixed population of light and dark secretory cells within the tumor lobules, the histochemical findings (presence of sialomucin and absence of iron as well as periodic acid‐Schiff positive, diastase‐resistant granules), and the results of ultrastructural studies support the histogenetic postulate that this mucinous adenocarcinoma is probably derived from the secretory cells of the eccrine coil. Our interpretation concurs with Headington's view of origin from the eccrine glands.