[A urachus cyst revealing a torpid Crohn's disease in a young adult with chronic fever]. / Kyste de l'ouraque révélateur d'une maladie de Crohn torpide chez un adulte jeune atteint d'une fievre nue chronique.

INTRODUCTION: This case report describes a rare situation in which a superinfected cyst of the urachus complicated initially unknown and inactive Crohn's disease. CASE: A 21-year-old man presented a chronic fever finally attributed to a superinfected urachal cyst. Six months after ablation of the cyst, progressive Crohn's disease was diagnosed. DISCUSSION: The association of Crohn's disease and a superinfected urachal cyst is extremely rare. The case reported here is original in two aspects: the slowly progressive Crohn's disease was diagnosed after its complication; the superinfection developed through local bacterial translocation (ileal loop adjacent to the urachal cyst).