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| Epithelial
cysts (EPIDERMOID CYST) may be derived from plugged hair follicles
or from inclusions of squamous epithelial cells that have penetrated deep
into the dermis (i. e. following
trauma or congenitally) (#21815). These
cysts are filled with keratin from desquamation of the hyperkeratotic,
stratified squamous epithelial cells which line the cysts (#21816).
In contrast to dermoid cysts, these lesions do not have any dermal
appendages in the cyst wall (#21817).
They are often incorrectly referred to as "sebaceous"
cysts which are rare on the lids. Rupture
of these cysts may cause foreign body granulomatous reaction.
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| Clinical
#21815 |
Low
Power #21816 |
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| Med.
Power #21817 |
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