DERMOID CYSTS (Definition - Pathogenesis - Clinical Picture

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DERMOID CYSTS (Definition - Pathogenesis - Clinical Picture - Complication- Treatment )

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Thursday, 10 December 2009 20:27

Definition:
ط Cysts which may be formed in S.C tissue from only dermal elements (lined by stratified squamous epithelium).
ط If mesodermal elements are present hence called teratodermoids as in ovary & testis.
ط If arising from embryonic tracks e.g. thyroglossal cyst & branchial cyst, then called tubulodermoid.
Types:
[1] Sequestration dermoids:
ط Due to sequestration of a part of skin at deeper S.C. level at the sites of fusion during development.
ط Although congenital in origin it may appear late.
- Common sites: "Lines of fusion".
1- Midline of the body.
2- Outer angle of the orbit "Commonest" [Ext. angular D.].
3- Nasolabial fold & pre - auricular region.
ط The cyst contain seb. material and hairs.
ط It is not attached to skin but may be attached to underlying tissues by fibrosis.
ط Dermoid cysts in the head may be connected to meanings by fibrous connection.
ط Dermoid cysts over bone may cause indentation of the bone.
[II] Implantation dermoids:
ط Due to puncture wound driving part of skin to S.C tissues.
ط Common sites: fingers, palms, leg & cornea.
ط Sometimes the epidermis is implanted alone  epidermoid cyst which does not contain hairs.
Treatment: Surgical excision.
SOURCE: Prof. AYMAN SALEM'S BOOK
Copyright: (Vascular Society of Egypt ) & (Medical Educational web)
Not to be reproduced without permission of Vascular Society of Egypt

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