sections from all 112 naevi were examined histologically , without access to the clinical history , and the following features noted : type of melanocytic proliferation in the basal layer area , contiguity of epidermal and dermal components , total width and depth of naevus , involvement of subcutaneous fat and of skin appendages , the presence or absence of an 'indian file ' type of naevus cell infiltration , cellular atypia and evidence of maturation of these cells .
C0221925
basal
C0014520
epidermal