Tumor triquilemal proliferante: relato de caso

Abstract

Proliferating trichilemmal tumor (PTT) is an uncommon neoplasm arising from the follicular isthmus. Its histological characteristic is the presence of trichilemmal keratinization. PTT usually presents as a solitary nodule on the scalp of elderly women. We describe a case of a PTT on the gluteal region (buttocks) of a 16-year-old female, presenting as a solitary nodule.

Proliferating Trichilemmal Tumor of the Gluteal Region of a Young Man with Spontaneous Regression

“…The tumor is characterized histologically by the proliferation of basaloid and squamous cells with abrupt trichilemmal keratinization, and varying degrees of cytologic atypia. This is a case of an uncommon tumor on a rare location of a young male, and only one similar case has ever been reported [2].…”

“…About 90% of cases involve scalp lesions, described clinically as pink to reddish, subcutaneous, and cystic nodule that slowly progresses to a large, nodular mass that may ulcerate and bleed. The residual 10% of cases are found on nose, mons pubis, vulva, and buttocks [1] [2]. In more than 80% of cases, women are affected, and the average age of patients is 65 years.…”

Proliferating trichilemmal tumor of the nose

“…1,2,5 Etiopathogenesis remains unknown but in most cases it appears to developed within the wall of a pre-existenting pilar cyst as complication of trauma and inflammation. 6 It has also been reported to develop in nevus sebaceous and human papillomavirus has also been implicated.…”

“…1,2 They are slow growing lobular tumors, whose histologic hallmark is the presence of trichilemmal keratinization. 3 Tumors with an invasive growth pattern or cytologic atypia have an unpredictable course and may be locally aggressive or metastasize.…”

Invasão Intracraniana por Carcinoma Triquilemal

“…Carcinoma Triquilemal é uma lesão maligna rara a qual se origina de células do folículo piloso (bainha externa da raiz do folículo capilar). Acomete indivíduos de ambos os sexos entre 40 e 90 anos de idade 1,3,5,6,7 .…”