Pathology of Poroma
Poroma represents a group of benign tumours characterised by monomorphous neoplastic epithelial cells that show ductal differentiation.
This tumour shows histological overlap with hidradenoma.
Previously some authors have grouped them together under the term 'acrospiroma'.
Some authors have subdivided Poroma into:
1.Hidroacanthoma group: Hidroacanthoma simplex or intraepidermal poroma (Smith and Coburn 1956) is a form of poroma in which nests of cells with tubular differentiation are confined to surface epidermis.
There is no evidence of dermal involvement.
Differential diagnosis: Includes melanocytic neoplasm and clonal seborrheic keratosis. Differentiation of hidroacanthoma simplex from clonal seborrheic keratosis-an immuno histochemical study.
2. Poroma group: Intraepidermal and dermal
3. Dermal duct tumour - Intradermal lesion.
Poroma containing prominent ductal lumina are known as "Dermal ductal tumour." (Winklemann RK and Mcleod WA 1966).
But the tendency, nowadays is to classify all forms as Poroma.
Recent analysis suggests that poromas can be of either eccrine or apocrine lineage. Poroma of apocrine lineage are more common.
Clinically presents as solitary papule or nodule in elderly patients.
Site: Poromas are usually located on the hands and feet .
Related post: Porocarcinoma
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