The poroid hidradenoma is a rare benign intradermal neoplasm rare that is poorly described in the literature. It usually affects elderly individuals and is characterized as a solitary, painless and well-circumscribed nodule. The diagnosis is confirmed by the histological characteristics of the hidradenomas and poromas. The treatment corresponds to complete surgical excision, thus avoiding recurrence and malignancy. The authors report a case of a 64 year-old patient, with a single, well-delimited and asymptomatic nodular lesion that had emerged 5 months before.

Keywords: Neoplasms, Adnexal and skin appendage; Poroma; Sweat gland neoplasms

Porokeratoma is an entity defined as an acanthoma with porokeratosis characteristics. It has a distinct histological pattern from that of the cornoid lamella and has clinical differences regarding the typical porokeratosis. The condition has been described only recently and there are few cases reported in the literature. The authors report the case of a 46 year-old male patient with an exophytic nodular lesion located in the intergluteal region. Histological examinations evidenced multiple cornoid lamellae, with those located on the periphery being better defined. Based on the clinical and histological appearance, the lesion was diagnosed as a porokeratoma.

Keywords: Acanthoma; Keratosis; Porokeratosis

Follicular thyroid carcinoma is a well-differentiated tumor, and is considered the second most common subtype of thyroid cancer. Its metastasis usually arises hematogenously — mainly to the lungs and bones — and is considered rare when it occurs cutaneously. The authors report a case of a patient with follicular thyroid carcinoma for 5 years who noticed an erythematous, friable exophytic nodular lesion measuring 1cm on the scalp with 7 months of development, simulating a pyogenic granuloma. Biopsy analysis revealed an adenocarcinoma with glandular differentiation and colloid material in the lumen. The immunohistochemical profile was positive for CK-7 and thyroglobulin, favoring the diagnosis of cutaneous metastasis of primary thyroid neoplasia.

Keywords: Dermatology; Granuloma, Pyogenic; Neoplasms; Neoplasm metastasis