Brittany Ritchie MD, Presenter: Nothing to Disclose

Liem Thanh Mansfield MD, Abstract Co-Author: Nothing to Disclose

Steven Peckham, Abstract Co-Author: Nothing to Disclose

1. Epidermal inclusion cyst is commonly seen in the extremities. 2. Despite its name, epidermal inclusion cysts may present as a solid mass on clinical exam and imaging studies mimicking soft tissue sarcomas. 3. On radiography, they present as non-calcified masses that may erode the adjacent bone. 4. On sonography, epidermal inclusion cysts arise from the dermis without or with visible sinus tract to the skin. They have variable echogenicity, distal acoustic enhancement, and without internal vascularity. 5. On CT, they are found in the subcutaneous fat compartment, contact the dermis, and have Hounsfield measurement of fluid. Post contrast, there is peripheral enhancement of the cyst wall. 6. On MR, epidermal inclusion cysts are subcutaneous masses that contact the dermis. On T2WI, they may have heterogeneous appearance mimicking a solid mass. However, on T1WI with fat suppression, there is peripheral enhancement consistent with a simple cyst.

1. Review the clinical presentation of epidermal inclusion cysts 2. Review the histopathological appearance of epidermal inclusion cysts 3. Imaging appearance of epidermal inclusion cysts a. Radiography b. Sonography c. CT d. MR imaging 4. Imaging appearance of unruptured and ruptured epidermal inclusion cysts

http://abstract.rsna.org/uploads/2014/14011946/14011946_vemj.pdf

Ritchie, B, Mansfield, L, Peckham, S, Skin Deep: Radiologic Pathologic Correlation of Epidermal Inclusion Cysts in the Extremities.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14011946.html