[Obstruction: a rare complication of congenital giant blue nevus].

[BACKGROUND] The blue nevus is an acquired or congenital dermal melanosis, usually small in size. It is sometimes giant and responsible for complications.

[CASE REPORT] A newborn had a large infiltrated blue news located on buttocks, lombosacral and perianal areas. He was admitted at the age of 3 weeks for an intestinal obstruction which was due to an impassable anal stenosis secondary to the infiltrated nevus. The tumor was excised twice, completed by plastic surgery at the age of 10 months.

[CONCLUSIONS] This rare congenital giant blue nevus was responsible for an unreported intestinal obstruction. The risk of malignant transformation was another reason for complete excision.