Clear Cell Hidradenoma-Basal Cell Carcinoma Collision.

A 91-year-old man presented with a tumor on the left temporal area, clinically suspicious of basal cell carcinoma. The histopathologic study showed a central solid-cystic tumor composed by 3 different types of cells (clear or finely granular cells, polygonal cells, and squamoid cells). It had a sclerotic stroma.

Complete regression of melanoma associated with vitiligo.

A 53-year-old woman presented with vitiligo. A pigmented lesion was disclosed in the physical examination. Its histopathologic study showed the presence of a band of melanophages in an uneven distribution.

Comparative study of pagetoid dyskeratosis between acrochordons and soft fibromas.

Background: Pagetoid dyskeratosis (PD) is considered a casual finding. We can find it in some conditions, including acrochordons and soft fibromas.

Objective: (1) to compare the presence of PD in soft fibromas and acrochordons and (2) to compare PD positive fibromas and PD negative fibromas.

[Umbilical cutaneous endometriosis associated with a large uterine myoma].

We present a 44-year-old female patient who was being studied by the Gynecology Department because of the presence of large abdominal masses which proved to be leiomyomas on histological analysis. The Dermatology Department was consulted because of an asymptomatic umbilical tumor which had been developing for 5 years. Upon histological examination, we observed glands with angular lumens that showed decapitation secretion distributed throughout the dermis, surrounded by a cellular stroma with extravasated erythrocytes.

[Hyperkeratotic vascular malformations. Presentation of three cases].

Hyperkeratotic vascular malformations (verrucous hemangiomas) are infrequent vascular lesions present from birth. Initially, they are reminiscent of port wine stains or childhood hemangioma, but over time they gradually take on their typical warty and hyperkeratotic appearance. These changes are probably due to trauma, scratching and bleeding episodes.

[Segmental anhidrosis associated with Adie's pupil: an incomplete case of Ross syndrome].

We present the case of a 43-year-old woman who presented with a localized area of anhidrosis on the upper left trunk and ipsilateral upper limb. It was associated with Adie's tonic pupil and an area of compensatory hyperhidrosis on the contralateral side. After 9 years of follow up, the alterations have remained stable.