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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).
[1]: 663 They are skin-colored or yellowish firm, rounded bumps, 1–3 mm in diameter, and may be confused with xanthoma, milia, hidrocystoma, trichoepithelioma, and xanthelasma. [2] They are more common in women [ 3 ] and are most commonly found in middle-aged Asian women.
The periocular region, which includes the meibomian, Zeis, and sebaceous glands of the caruncle and eyelid, is the most common site accounting for up to 75% of SGc. [6] Meibomian glands are a type of sebaceous gland that lines the upper and lower eyelids and do not contain a follicle. The glands of Zeis contain the individual eyelash.
All squamous cell carcinoma lesions are thought to begin via the repeated, uncontrolled division of cancer stem cells of epithelial lineage or characteristics. Accumulation of these cancer cells causes a microscopic focus of abnormal cells that are, at least initially, locally confined within the specific tissue in which the progenitor cell resided.
Conjunctival concretions are generally asymptomatic.Common symptoms include eye discomfort, eye irritation, and foreign body sensation. Sometimes, the larger, harder or multiple concretions make the rubbing off of the superficial layers of the conjunctiva or eyelids to cause conjunctival abrasion, especially prominent when blinking.
The most common eyelid tumor is called basal cell carcinoma. This tumor can grow around the eye but rarely spreads to other parts of the body. Other types of common eyelid cancers include squamous carcinoma, sebaceous carcinoma and malignant melanoma. The most common orbital malignancy is orbital lymphoma. This tumor can be diagnosed by biopsy ...
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