Type:
Educational Exhibit
Keywords:
Education and training, Cysts, Education, Ultrasound-Power Doppler, Ultrasound-Colour Doppler, Ultrasound, Soft tissues / Skin, Musculoskeletal soft tissue
Authors:
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
DOI:
10.1594/ecr2018/C-1455
Background
Epidermal inclusion cysts are common benign lesions which occur due to the migration of epidermal tissue into the dermis or subcutaneous tissues.[1]
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.[2] Other causes include inflammation of the pilosebaceous structures or infection of the eccrine duct with human papilloma virus 60.[1]
They can occur anywhere in the body with a predilection for face,
scalp,
neck and trunk.[2,3] Extremities and other locations like breast and scrotum account for less than 10% of the cases.[2] 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.[2]
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.[2]