Histomorphological and Immunohistochemical Reappraisal of Cutaneous Adnexal Tumours: A Hospital Based Study

Table 9

Salient histopathological feature of troublesome tumours.

Sweat gland tumour (digital papillary tumour)	(i) Multinodular epithelial aggregates with cystic spaces in the dermis.; (ii) Papillary epithelial projections within cystic spaces associated with fibrovascular cores in some areas.; (iii) The epithelium made of low columnar cells and cysts filled with eosinophilic material.; (iv) Mitoses and necrosis seen.
Hidradenoma papilliferum	(i) Dermal nodule with scattered cystic and branching spaces.; (ii) Numerous papillary projections lined by single layer of high cylindric cells with a basal layer.; (iii) Active decapitation secretions.
Chondroid syringoma	(i) Nodular tumour.; (ii) Branching tubular epithelial cells in basophilic stroma.; (iii) Tubular lumina lined by cuboidal cells (luminal) and flat cells (periphery).; (iv) Mucoid stroma.
Trichilemmal carcinoma	(i) Invasive tumour with solid and trabecular pattern seen.; (ii) Cytologically atypical clear cells with foci of pilar type keratinization.
Desmoplastic trichoepithelioma	(i) Narrow strands of tumour cells; (ii) Numerous horn cysts; (iii) Desmoplastic stroma; (iv) Areas of calcification