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Dermpath-India

Pathology of Superficial

Spreading Melanoma  

"The most common subtype of Melanoma"

Dr Sampurna Roy MD          

 

                                                                                                                      

 

Superficial spreading melanoma may develop in any part of the body and at any age.

It is commonly noted on the trunk and lower extremities.

Macroscopically, the lesion has a variegated colour and an expanding irregular margin.

Microscopic features:

  

Histologically, superficial spreading melanoma may be in-situ or invasive.

It is a poorly circumscribed, asymmetrical lesion.

The epidermis may show irregular elongation of rete ridges, hyperkeratosis and parakeratosis.

There is proliferation of atypical melanocytes at all levels in the epidermis.

The tumour cells in superficial spreading melanoma are present singly and in nests.

There is evidence of pagetoid spread in the epidermis (buckshot spread).

The tumour cells in superficial spreading melanoma may be epithelioid, spindle or nevus cell-like in appearance.

The invasive tumour is usually composed of epithelioid-type of cells.

Nuclear pleomorphism is evident and there are atypical mitotic figures.

The superficial adnexal epithelium may be involved.

 

The differential diagnosis includes extramammary and mammary Paget's disease, squamous carcinoma with pagetoid pattern in the epidermis .

S100 protein and HMB45 stains are positive in melanoma.

Verrucous melanoma is a variant of superficial spreading melanoma and is characterized by prominent epidermal hyperplasia and elongation of rete ridges.

Pigmented Bowen's Disease of the Finger Mimicking Malignant Melanoma.

 

Further reading:

Molecular cytogenetic characterization of a novel cell line established from a superficial spreading melanoma.

Sun exposure, phenotypic characteristics, and cutaneous malignant melanoma. An analysis according to different clinico-pathological variants and anatomic locations.  

Only superficial spreading melanoma is causing the melanoma epidemics?

Invasive superficial spreading melanomas arising from clinically normal skin.

Superficial spreading melanoma arising in a longstanding melanocytic nevus on the sole.

 

 

 

Dr Sampurna Roy  MD

Consultant  Histopathologist (Kolkata - India)


 

 

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