Clinical study of the congenital melanocytic naevi in the child and adolescent.

BACKGROUND

The classification of the congenital melanocytic nevus (CMN) and the magnitude of the risk of transformation into melanoma are still controversial.

OBJECTIVE

To analyse the profile of the CMN in the child and teenager at IPPMG-UFRJ according to sex, skin colour, age, clinical type, locations and evolution.

METHODS

Longitudinal study of retrospective and prospective cohort from 1994 to 2007. Aleatoric sample from spontaneous or referal demand.

RESULTS

30 children and 30 teenagers showed 74 nevi: 60,8% (small), 27% (medium), 5,4% (large) and 6,7% (giant); from these, 45,9% were in the male sex and 54% in the female sex. There were 45,9% in white and 54% in non-white. Sex and skin colour didn't influence the clinical type. Among the small and medium nevi, 27,1% were located in the trunk, 23% in the head and neck; the large and giant ones in the head,neck, back and limbs; 28,3% were attended for more than 10 years, 47,3% between three and nine years and 24,4% for a time below three years; the small and medium CMN kept unchanged. The fading of the lesion was observed in one large and in two giant CMN. No cases of melanoma were observed.

CONCLUSION

An homogeneous distribution among white/non white and male/female; the sex and the ethnic group did not influence the clinical type; the small CMN was the most frequent clinical type mainly in the trunk.