MALIGNANT TRANSFORMATION WITHIN BENIGN ADNEXAL SKIN TUMOUR– A RARE MALIGNANT TRICHOGENIC TUMOR

Dr POORNIMA S BHAT; DR MADHU CP; DR VIJAY L; DR SUDHIR S; DR SREE HARSHA MV

Volume : V, Issue : IV, April - 2016

MALIGNANT TRANSFORMATION WITHIN BENIGN ADNEXAL SKIN TUMOUR– A RARE MALIGNANT TRICHOGENIC TUMOR

Dr Poornima S Bhat, Dr Madhu Cp, Dr Vijay L, Dr Sudhir S, Dr Sree Harsha Mv

Abstract :

Trichoepithelioma is a rare benign skin lesion that originates from hair follicles. Trichoepitheliomas are mostly seen in the scalp, nose, forehead, and upper lip. Trichoepithelioma is histologically similar to basal cell carcinoma and has a rare risk of malignant transformation. In addition, most frequent incidence of this disease in young to elderly women may lead to social and psychological issues. Precise diagnosis and management of this rare disease seem necessary. We report to you an unusual adnexal tumor on the scalp of a 24–years–old woman with trichoepithelioma. Histologic examination of the tumor showed it to merge with adjacent areas of classic trichoepithelioma. The tumor showed cytologic atypia, mitotic figures, necrosis, deep infiltration, pseudoglandular pattern and areas of squamous differentiation . The differential diagnosis of this malignant follicular neoplasm included malignant trichoepithelioma and basal–cell carcinoma with matrical differentiation. The unique clinicopathologic features, however, raised consideration of a "malignant trichoepithelioma."