A case of primary cutaneous mucinous carcinoma in the scalp

An otherwise healthy 80-year-old woman presented with a 2-year history of a progressively growing nodule on the scalp, without pain, bleeding, or discharge.The physical examination showed an erythematousviolaceous cupuliform nodule on the left occipital region, measuring 18 15 mm (Fig. 1A).No lymphadenopathy was noted.Histopathological examination revealed a circumscribed dermal nodule with pools of mucin separated by thin fibrous septa (Fig. 1B andC), containing islands of neoplastic epithelial cells with eosinophilic cytoplasm, small central nuclei, minimal pleomorphism and no mitotic activity (Fig. 1D), suggestive of primary cutaneous mucinous carcinoma (PCMC).The lesion was excised with clear margins.Extensive diagnostic workup, including breast and