Epidermoid cyst in the upper arm


Epidermoid cyst

  • Epidermoid cysts are also called as epidermal cysts or epidermal inclusion cysts.
  • These cysts occur due to proliferation of epidermal cells.
  • Multiple mechanisms are suggested in the formation of epidermoid cysts.
  • In some studies, HPV is also indicted in the etiology of these cysts.


  • It appears hypointense on T1WI and hyperintense on T2WI.
  • On T1FS images it shows suppression, while on post-contrast study it shows generally minimal peripheral enhancement with non-enhancing central part or may be entirely non-enhancing.