Q:        Write short note on types and classification of melanoma

A:       

            Definition = melanoma is malignant skin tumour arising from melanocytes.

 

Clinical types/classification

1-            Nodular melanoma (worse prognosis)

2-            Superficial spreading (better prognosis)

3-            Lentigo maligna melanoma (best prognosis)

4-            Acral lentigenous melanoma (worst prognosis)

 

Clinical staging

TNM for staging

 

Clarke classification

I     :     in situe (within epidermis)

II   :     in papillary dermis

III  :     reaches junction of papillary-reticular dermis

IV  :     into reticular dermis

V   :     into fat

 

Breslow classification

Thin                 =       less 0.75 mm           

Intermediate    =       0.75 – 1.5 mm

Thick               =       1.5 – 3 mm

Very thick       =       over 3 mm