: tumors exhibiting features of the epidermal sweat duct unit.
Eccrine porocarcinoma (malignant eccrine poroma
): a series of eight challenging cases.
In differential diagnosis, the lesion can be clinically mistaken for dermatofibroma, pyogenic granuloma, irritated seborrhoeic keratosis, keratoacanthoma, actinic keratosis, malignant skin lesions (basal cell carcinoma, squamous cell carcinoma, and malignant melanoma), [2-9] plaque psoriasis, eccrine poroma
,  viral warts, or metastatic cancers.
The clinical differential diagnosis included supernumerary nipple, eccrine poroma
, clear cell acanthoma, papillary eccrine adenoma, tubular apocrine adenoma, keloid, melanoma, and nonmelanoma skin cancer.
Black, "Malignant eccrine poroma
: a study of twenty-seven cases," British Journal of Dermatology, vol.
In some cases, for example, a patient who has hidroacanthoma simplex (HAS; also known as intraepidermal eccrine poroma
) may be misdiagnosed as SK.
Histological examination showed a poroma of mixed eccrine poroma
and poroid hidradenoma subtypes.
, sebaceous hyperplasia, and pilomatrixoma were the most common benign tumors and two sebaceous carcinoma were the only two malignant tumors seen.
is a benign tumor, which arises from the intraepidermal portion of the eccrine sweat glands.
The sweat glands tumors are comprised of chondroid syringoma, eccrine poroma
, nodular clear cell hidradenoma, apocrine hidrocystoma, and syringocystadenoma papilliferum (Figure 1).
My initial diagnosis was an eccrine poroma
. These are generally benign, however, to be on the safe side I referred the patient for a biopsy.
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