Blue nevus of the lymph node capsule. Report of a case.

A case of blue nevus in the lymph node capsule is described. It's not a common pathology and only few cases have been reported so far. Nevus-cell aggregates in the same location are more frequent and difference between the two entities is described. So for histogenesis of these lesions, a melanocyte migration arrest is favoured rather than the hypothesis of a 'benign metastasis' from a cutaneous primitive site.