Trichilemmal or Pillar cyst is one such entity, which presents in both a non-neoplastic and
neoplastic form. These cysts occur preferentially in areas with dense hair follicle concentration,
therefore 90% occur in the scalp. Moreover, they are the most common cutaneous cysts in the
scalp and secondly common in the head and neck region. Pillar cysts are almost always benign,
with malignant transformation occurring rarely. In 2% of cases, pillar cysts occur either single or
multiple[1].We present a case encountered at NCI-Sabratha with literature review.
Keywords: Malignant Proliferating Trichilemmaltumor; Proliferating Trichilemmal tumor;
Squamouscell carcinoma; Pilar tumor;Epidermoid cyst.