"Although they can be found anywhere, they are typically located on the scalp, face, neck, trunk, and back 1. Rare locations include the larynx or bones (intraosseous epidermoid cyst 2)."
"tubular: ~8%."
"T1: low/intermediate signal"
"T2: high signal"
"The term sebaceous cysts is a misnomer; the lesion does not originate in the sebaceous glands."
Expected headings
"Complications"
"Epidermal inclusion cysts or epidermal cysts result from implantation of epidermal cells into the dermis. They are located deep to skin or mucosa and present most often on the scalp, face, neck or trunk."
"Cysts are filled with keratin, a protein constituent of skin, hair and nails, and are lined by epidermis. They are thought to occur as a result of 1,2:"
"When small they can appear anechoic and cystic. Using subcutaneous fat as a reference, lesions tend to be hypoechoic. Larger lesions can be a little heterogeneous due to the presence of mucoid material, fat, calcification or pus. An uncomplicated cyst is avascular. They can have a variable appearance when ruptured, occasionally associated with vascularity and lobulated contours 6. On colour Doppler, it may show twinkling artifact 8."
"The attenuation of epidermal inclusion cysts is typically 0-20 HU but high protein or calcium content will increase attenuation. Uncomplicated cysts are well-circumscribed, round or lobulated."
"Ruptured cysts may have septa, thick and irregular rim enhancement and can be accompanied by fuzzy enhancement in surrounding subcutaneous tissues 1."
"The term sebaceous cysts is a misnomer; the lesion does not originate in the sebaceous glands."