This is a type of acrospiroma
that is limited to the epidermis, with limited or no fingers of tumor pushing down into the dermis (the typical feature of poroma).
Hidradenoma is a rare benign adnexal neoplasm that differentiates towards eccrine and apocrine apparatus.1 It is also known as nodular hidradenoma, nodulocystic hidradenoma and acrospiroma
. It can occur at all ages with female preponderance.
(1,4) MNH has been described in the literature using various nomenclature, including clear cell hidradenocarcinoma, malignant clear cell myoepithelioma, malignant clear cell hidradenoma, clear cell eccrine carcinoma, and malignant clear cell acrospiroma
. (1,2,4,5) MNH is usually found on the face, scalp, or anterior surface of the trunk, (3-6) typically arising de novo, but on occasion transforming from the benign variant.
Nodular hidradenoma, also known as clear cell hidradenoma or acrospiroma
is a benign rare skin tumour arising from the eccrine type of sweat glands.1,2 They can arise anywhere in the body but usually involve the trunk, extremities and head.2,3 It usually presents as a slow growing, solitary palpable nodule.
Dermatologic entities with similarities in histologic appearance include hidradenoma, apocrine cystadenoma, eccrine acrospiroma
, papillary eccrine adenoma, apocrine adenoma, chondroid syringoma, and tubular apocrine adenoma [2, 4, 7].
Other cystic lesions included in the differential diagnosis of eccrine hidrocystomas are follicular cysts, epidermal inclusion cysts, hemangioma, lymphangioma, apocrine hidrocystoma and eccrine acrospiroma
A malignant eccrine acrospiroma
(MEA) is a rare cutaneous tumor.
represents a group of benign ductal tumours of the eccrine sweat glands that sometimes are connected to skin.
Hidradenoma and Hidradenocarcinoma.--Clear cell hidradenoma, also known as eccrine acrospiroma
, usually presents as a solid and cystic nodule with no site predilection, although it is only rarely reported to occur on the vulva.
A rare case of atypical eccrine acrospiroma
of the scalp and a literature review.
is an uncommon adnexal tumor arising from eccrine glands and commonly seen on the face and the upper extremities.
In fact, in 1969, Johnson and Helwig grouped them in the same diagnostic category (acrospiroma
), and in 1990, Abenoza and Ackerman, although considering them to be different neoplasms, described a benign tumor showing intermediate histologic characteristics (poroid hidradenoma).