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Dr Sampurna Roy
MD
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Case Index Infectious Disease Online; INDEX: A-D ; INDEX: E-L ; INDEX: M-P ; INDEX: Q-Z ; FUNGAL DISEASE ; VIRAL DISEASE. |
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Benign sweat gland tumours Cysts: Hydrocystoma -Eccrine/Apocrine Porokeratotic eccrine ostial naevus Benign Neoplasms: Syringocystadenoma Papilliferum Chondroid Syringoma (benign mixed tumour) Low grade: Primary extramammary Paget’s disease Intermediate grade: Digital papillary adenocarcinoma High grade: |
| This is
a rare form of sweat gland carcinoma which has a striking resemblance to
the adenoid cystic carcinoma of the salivary glands.
Adenoid cystic carcinomas are regarded by some authors as apocrine in origin. Site: Located on the scalp and on the chest. Rarely the tumour arises from the skin of the eyelid. Adenoid Cystic Carcinoma of the External Ear ; Pulmonary Adenoid Cystic Carcinoma. Microscopic features:
Images: - Cords of basaloid
cells arranged in a cribiform pattern. Immunohistochemistry:
Epithelial membrane antigen: Positive Differential diagnoses: 1. Adenoid basal cell carcinoma: [Adenoid cystic carcinoma is characterized by: Absence of retraction artefact , absence of contiguity with the epidermis or hair sheaths , lack of peripheral palisading of the nuclei, and occasional presence of central apoptotic or even necrotic cells. Pseudocysts stain positively to Alcian blue and periodic acid-Schiff ]. 2. Primary cutaneous cribriform carcinoma: Unlike most of the sweat gland carcinomas, this tumour tends to recur locally and rarely spreads to lymph nodes or distant organs. |
| Surgical-Pathology.com |
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Tumours of the Hair Follicle Hair Germ Differentiation: Desmoplastic Trichoepithelioma
Cutaneous lymphadenoma Tumour of Follicular Infundibulum Outer root
sheath differentiation: Proliferating Trichilemmal Cyst (Pilar Tumour)
Matrical differentiation: |