Dermoid cyst ByMomen Ali Khan

Definition

It is a cyst lined by skin and deep to skin

ClassificationCongenitalSequestration dermoidTubolodermoid- thyroglossal cyst, anal dermoidTeratomatous dermoid

Acquired Implantation dermoid

Composition

Composition of dermoid cyst- opaque mixture of Epithelial debris Sweat Sebum Hair follicle

Sequestration dermoidClinical featurePainless swelling arise in second or third decade oflife.ExampleDermoid cyst on centre of foreheadDermoid cyst on roof of nosePost auricular dermoidDermoid cyst on lateral angle of eyeball

Implantation dermoid

Due to minor trauma or prick ,skin implant into deep causes dermoid cyst.Clinical featurePainless slowly progressive swelling

Common siteFingerToeFoot

Teratomatous dermoid�In ovary: dermoid cystTestis: teratoma�Mediastinum: mediastinal cyst�Retroperitoneum: retroperitoneal cyst�Postanal dermoid�

Differential DiagnosisSebaceous cystLipomaFibromaNeurofibroma

Investigation X-ray of part both AP and lateral view CT scan of brain if dermoid in skull ECG RBS

Treatment

Simple excision under local anesthesiaGeneral anesthesia require in some case

Complication Complications of dermoid cyst-

Infection�HemorrhagePressure effect on adjacent structure�Calcification�Rupture and surface ulceration�