TABLE Differential diagnosis for dermatomally distributed nodules (4) Neoplasms Benign Syringocystadenoma papilliferum, trichoepithelioma
, cutaneous schwannoma Malignant Basal cell carcinoma, cutaneous metastases, lymphoma, plasmacytoma, squamous cell carcinoma Other mucocutaneous Granuloma annulare, neurofibromatosis type 1, conditions pseudolymphoma, rheumatoid nodules, sarcoidosis, xanthomas Adapted with permission from: Hager CM, Cohen PR, Tschen JA.
The benign, hair-germ tumors trichoblastoma (TB) and trichoepithelioma
(TE) most commonly arise on the head and neck.
Complex adnexal tumor of the primary epithelial germ with distinct patterns of superficial epithelioma with sebaceous differentiation, immature trichoepithelioma
, and apocrine adenocarcinoma.
Her daughter also had trichoepithelioma
in the nasolabial folds.
Among the hair follicular tumours, Trichoepithelioma
and Pilomatricoma were the common types observed in this study.
9) Differential diagnosis between trichoepithelioma
(TE), trichoblastoma, trichofolliculoma, trichoadenoma, and BCC may be very difficult for the clinician and the pathologist.
6-8 CD10 has been recognized as a useful marker to differentiate BCC from trichoepithelioma
It is of limited value in differentiating infiltrative BCC from desmoplastic trichoepithelioma
(DTE), although BCC shows diffuse staining and DTE shows partial staining 16.
4) Marlowe and Cron reported a sebaceous nevus that transformed into three distinct neoplasms: an intradermal nevus, a trichoepithelioma
, and a basal cell carcinoma.
Basaloid proliferations described in patients with BDC are basal cell nevi and trichoepithelioma
In benign lesions, trichoepithelioma
has incidence of 8% and syringoma 5.