Histology of excised tissue shows stratified squamous epithelium over fibrocollagenous stroma, cords and wide column of basaloid cell extending into the dermal stroma from overlying epithelium, rich vascularity within stroma in between these cords, confirming the diagnosis of periungual eccrine poroma
, sebaceous hyperplasia, and pilomatrixoma were the most common benign tumors and two sebaceous carcinoma were the only two malignant tumors seen.
However, the final diagnosis, according to histologic and immunostaining methods, was a benign eccrine poroma
Although eccrine poroma
, a tumor derived from the acrosyringium, most often presents on plantar or palmar skin, it may occur at any site containing sweat glands.
It was subsequently confirmed the tumour was indeed that of a benign eccrine poroma
and the lesion was excised.
A skin excision biopsy was carried out, whose report was a dermal tumor mass from the lower portion of the epidermis, well de fined, formed by small cuboidal cells without atypia, arranged in well-defined bands that anastomose without barricade, with pigmented areas and few dilated ducts, which are in contact with the resection margins, compatible with eccrine poroma
ABSTRACT: Eccrine poroma
is a benign tumor which arises from the intraepidermal portion of the eccrine sweat glands.
We considered the possibility of a porocarcinoma, the malignant counterpart of an eccrine poroma
They include benign adnexal tumors such as trichoblastoma syringocystadenoma papilliferum trichilemmoma sebaceoma nodular hidradenoma hidrocystoma and eccrine poroma
Cases where significant diagnostic differences were noticed included a suspicious Kaposi sarcoma (case 16), finally reevaluated as a dermatofibroma; an invasive squamous cell carcinoma of the head diagnosed as eccrine poroma
(case 21) on final microscopy; and a suspicious low-grade soft tissue sarcoma diagnosed as angioleiomyoma (case 22), which was confirmed with the help of immunohistochemical staining.
Histology shows lobulated tumor masses located in dermis resembling eccrine poroma
with two cell types.
Three subtypes of poroid neoplasia in a single lesion: eccrine poroma
, hidroacanthoma simplex, and dermal duct tumor.