Introduction:

Malignant nodular hidradenoma is a rare malignant eccrine sweat gland tumor considered a lesion of eccrine adnexal differentiation, which usually arises again, although a few arising cases on nodular hidradenoma have been described. In other words, it represents the malignant counterpart of nodular hidradenoma.

Objective:

To report a case, given the unusual occurrence of this entity, with a review of the criteria for its diagnosis.

Case report:

We report the case of a 74-year-old man with a neoformation in the right parietal region of the scalp.

Conclusions:

We should consider a malignant nodular hidradenoma when faced with a solitary, firm or fluctuant tumor, rare in the scalp, with aggressive evolution, recurrences and lymph node metastasis, and confirm its diagnosis with immunohistochemical study.

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