Summary

The solid-cystic poroid hidradenoma is an rare, benign, adnexal tumor originating from the eccrine sweat glands. It is well-circumscribed, firm and asymptomatic, with distinct microscopic features, including a combination of solid and cystic areas composed of poroid and cuticular cells. We report the case of a 59-year-old female patient who presented to the Dermatology Department with a cutaneous lesion on the left knee. The lesion measured 1 cm in diameter, was a etythematous, firm and non-tender nodule, with an progressively increased in size over approximately one year. The case was transfered to the Department of Plastic Surgery, where the lesion was completly excised and sent to the Department of Pathology for microscopic examination. Histopathological report confirmed the diagnosis of a solid-cystic poroid hidradenoma, highlighting its characteristic cellular components and eccrine differentiation. Given its rarity, this case contributes to the limited literature on this tumor variant and emphasizes the importance of microscopic examination in establishing an accurate diagnosis.