Inverted Follicular Keratosis

Inverted Follicular Keratosis

Senait W. Dyson, MD

David Cassarino, MD, PhD

Inverted follicular keratosis (IFK) is a well-circumscribed, endophytic epithelial proliferation. This tumor shows multiple connections to the epidermis image, and multiple folliculocystic structures (similar to milia) are present image.

High magnification of the center of this lesion shows bland squamoid cells surrounding small follicular lumina and smaller, peripheral, more basaloid-appearing cells image.



  • Inverted follicular keratosis (IFK)


  • Irritated seborrheic keratosis variant


  • Benign tumor of follicular infundibulum considered by many to be identical to irritated seborrheic keratosis



Jul 8, 2016 | Posted by in PATHOLOGY & LABORATORY MEDICINE | Comments Off on Inverted Follicular Keratosis

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