Coat-sleeve type giant congenital melanocytic nevus with intraoral blue nevus: A rare case report

Congenital melanocytic nevi (CMN) are visible hyperpigmented (melanocytic), benign, tumor like proliferations in the skin resulting from faulty development of pigment cell precursors in the embryo, and are composed of an abnormal mixture of skin elements. Giant congenital melanocytic nevus (GCMN) is usually defined as a melanocytic lesion present at birth that will reach a larger size in adulthood. GCMN is a rare variety of CMN which is characterized by its size (diameter >20 cm) and the potential for malignant transformation. It is infrequently associated with other findings, which makes the clinical picture complex. In this case, we report a rare association of GCMN with intraoral blue nevus in a 24-year-old male patient.