Derived and Imitated: Trichoblastoma

Trichoblastoma can be cogitated as a skin adnexal tumour enunciating a predominant follicular differentiation. Initially scripted by Headington in 1976, the benign tumefaction depicts a histology congruent of hair follicular basaloid or germinative cells. Trichoblastoma is contemplated as an exceptional, sporadic, benign tumour arising from the hair germ, partially or completely recapitulating the follicular evolution. Trichoblastoma is a cogent, generic term for neoplasm derived from follicular germinative cells appearing in the skin and subcutaneous fat. Lesions of trichoblastoma cogitate as gradually progressive nodules exceeding one centimetre in magnitude, commonly emerging within the deep dermal and subcutaneous tissue, particularly on the face, scalp and pelvic girdle. Malignant transformation is enunciated although trichoblastoma does not exemplify an aggressive neoplasm. Composite lesions comprising of a trichoblastoma in conjunction with tumefaction such as apocrine poroma, seborrheic keratosis, inverted follicular keratosis, verruca vulgaris or eccrine poroma are delineated.