Pilar (Tricholemmal) Cyst



Pilar (Tricholemmal) Cyst


Steven D. Billings, MD










Scanning magnification shows a dermal-based benign cystic lesion with dense eosinophilic tricholemmal keratinization, characteristic of a pilar cyst.






The lining is composed of stratified squamous epithelium with an abrupt transition to dense eosinophilic keratin.


TERMINOLOGY


Synonyms



  • Pilar cyst


  • Trichilemmal cyst


  • Isthmus-catagen cyst


Definitions



  • Benign unilocular cyst lined by squamous epithelium lacking a granular layer and containing abundant dense keratin material


CLINICAL ISSUES


Epidemiology



  • Incidence



    • 2nd most common type of cutaneous cyst


  • Age



    • Most common in adults


  • Gender



    • More common in women than men


Site



  • 90% of pilar cysts present on scalp

Jul 8, 2016 | Posted by in PATHOLOGY & LABORATORY MEDICINE | Comments Off on Pilar (Tricholemmal) Cyst
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