Simplified approach to umbilical remnant abnormalities.

Ultrasound of the discharging umbilicus

“…Symptomatic umbilical remnants are rare, and the commonest of these is the patent urachus. To aid in the radiological evaluation, a simplified classification scheme for all umbilical remnant abnormalities has been proposed [1]. In a type I remnant, the entire duct (vitelline or urachal) is patent; in type 2, only one end is patent; and in type 3 only the mid-portion is patent.…”

A case report of a patent urachus associated with a completely patent omphalomesenteric duct

“…Contrast radiographic studies are helpful when clinical findings are equivocal [1]. Indigocarmine was used in the present case because of the patient's hypersensitivity to iodine.…”

Sonography of Pediatric Urinary Tract Emergencies

“…Occasionally, there is failure of all or a portion of the urachal lumen to be obliterated. Such abnormalities are characterized as urachal remnant abnormalities and include patent urachus, urachal sinus, urachal diverticulum, and urachal cyst [16,17]. Urachal remnants are usually asymptomatic.…”

“…10] [16][17][18]. A tubular component can usually be identified, which along with the characteristic midline location allows for differentiation of infected urachal remnants from other causes of intra-abdominal abscesses .…”