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Acrospiromas are a broad class of benign cutaneous adnexal tumors. [1] Cutaneous adnexal tumors are a group of skin tumors consisting of tissues that have differentiated (i.e. matured from stem cells) towards one or more of the four primary adnexal structures found in normal skin: hair follicles, sebaceous sweat glands, apocrine sweat glands, and eccrine sweat glands. [2]
Hidradenoma refers to a benign adnexal tumor of the apical sweat gland. [1] [2] These are 1–3 cm translucent blue cystic nodules.It usually presents as a single, small skin-colored lesion, and may be considered closely related to or a variant of poromas. [3]
Hidrocystoma (also known as cystadenoma, [1] a Moll's gland cyst, [1] and a sudoriferous cyst [1]) is an adenoma of the sweat glands. [2]: 787 Hidrocystomas are cysts of sweat ducts, usually on the eyelids. [3]: 664 They are not tumours (a similar-sounding lesion called hidroadenoma is a benign tumour).
Syringocystadenoma papilliferum is a rare non-malignant adnexal neoplasm that develops from apocrine or eccrine sweat glands and can be identified histologically by cystic, papillary, and ductal invaginations into the dermis lined by double-layered outer cuboidal and luminal high columnar epithelium and connected to the epidermis.
Hidradenocarcinoma, also known as malignant hidradenoma, malignant acrospiroma, clear cell eccrine carcinoma, or primary mucoepidermoid cutaneous carcinoma, is a malignant adnexal tumor of the sweat gland.
A papillary hidradenoma, also termed hidradenoma papilliferum or mammary-like gland adenoma of the vulva, [1] is a rare, but nonetheless most common benign tumor that occurs in and between anal and genital regions (i.e. anogenital area) of females. [2]
In dermatologic pathology, a dermal cylindroma, also dermal eccrine cylindroma or cutaneous cylindroma [1]: 666 ) and (less specifically) cylindroma, is a benign adnexal tumor [2] that occurs on the scalp and forehead. Multiple cylindromas may grow together in a "hat-like" configuration, sometimes referred to as a turban tumor. [3]
Malignant acrospiroma, also known as nodular hidradenocarcinoma, malignant nodular clear-cell hidradenoma, mucoepidermoid hidradenocarcinoma, clear-cell hidradenocarcinoma, malignant clear-cell acrospiroma, and clear-cell eccrine carcinoma, [1] is a rare and aggressive tumour of the eccrine sweat glands. [2]