<prompt> True about dermoid cystLined by columnar epitheliumDose not contain hairMedian angle of eye is the most common siteRupture is associated with foreign body type inflammation  <response>: Ans. d Rupture is associated with Foreign body type inflammationRef: Short Cases Das Ch. 1 Dermoid cyst is lined by squamous epithelium and contains pultaceous material inside. Teratomatous type of dermoid cyst contains all layers -- epithelium, endothelium and mesothelium -- hence contain -- hair, muscle, teeth etc Most common type of dermoid is sequestration dermoid found at the line of fusion of epithelium -- common in external angular, postauricular etc. It produces bony indentation Rupture is associated with FB type inflammation. 