Education and training, Cysts, Education, Ultrasound-Power Doppler, Ultrasound-Colour Doppler, Ultrasound, Soft tissues / Skin, Musculoskeletal soft tissue
K. V. Arora1, N. MATHUR2, H. P. Jeswani3, S. Bhardwaj3, M. MANMOHAN1, A. Marik2, O. J. TAVRI1, T. Vu2, S. Pasoria2; 1Mumbai, Maharashtra/IN, 2Navi mumbai/IN, 3Mumbai, Ma/IN
Epidermal inclusion cysts are common benign lesions which occur due to the migration of epidermal tissue into the dermis or subcutaneous tissues.
This abnormal localization can occur due to aberrant embryogenesis wherein the ectodermal cells are misplaced during cellular differentiation or traumatic transplantation of the epidermis into the dermis. Other causes include inflammation of the pilosebaceous structures or infection of the eccrine duct with human papilloma virus 60.
They can occur anywhere in the body with a predilection for face,
neck and trunk.[2,3] Extremities and other locations like breast and scrotum account for less than 10% of the cases. They are usually solitary though multiple lesions can be observed as in Gardner’s syndrome.[1,2]
Most patients are asymptomatic and present with an incidental mass unless it grows in size enough to disturb the normal function or gets complicated by rupture,
infection or malignant transformation.[1,2]
Histopathologically they are lined by stratified squamous epithelium with a granular layer and contain varying degree of lamellated keratin debris within.
Ultrasonography is the modality of choice for the evaluation of subcutaneous epidermal inclusion cyst[1,2]; however its imaging characteristics can mimic other subcutaneous soft tissue lesions making the diagnosis difficult.