[Urachal remnant infection: keep it in mind during atypical abdominal pain in children].

Etiological diagnosis of abdominal pain is delicate due to its many possible causes. Those that are less frequent are consequently less known and can lead to a trickier diagnosis. We report on a rare case of a 2.5-year-old female patient presenting with abdominal pain in association with secondary dysuria due to an urachal remnant infection. Knowledge of the anatomical pathway of the urachal channel can discriminate its role during an atypical clinical case. The diagnosis is then based on ultrasound scans, which localize and characterize its contents.