title: Infected urachal cyst initially misdiagnosed as an incarcerated umbilical hernia.
abstract: BACKGROUND
  Urachal abnormalities are a rare cause of lower abdominal pain. They are often initially mistaken for more common causes of lower abdominal pain, and the diagnosis is usually made during evaluation for one of these more common conditions.
  
  
  METHODS
  We report a case of a painful periumbilical mass ultimately diagnosed as an infected urachal cyst. Although the cyst was evident sonographically, it was misidentified as an umbilical hernia, and the correct diagnosis was not made until the patient underwent computed tomography of the abdomen and pelvis before surgery.
  
  
  CONCLUSIONS
  Emergency physicians should consider urachal disease in patients presenting with lower abdominal pain and should also be familiar with both the clinical and radiologic findings characteristic of this disease.
authors.affiliation: Department of Emergency Medicine, North Shore University Hospital, Manhasset, New York, USA.
authors.forename: Adam
authors.initials: A
authors.lastname: Ash
authors.forename: Rashmeet
authors.initials: R
authors.lastname: Gujral
authors.forename: Christopher
authors.initials: C
authors.lastname: Raio
mesh_terms: D015746:Abdominal Pain / Q000209:etiology; D000293:Adolescent; D003937:Diagnosis, Differential; D006554:Hernia, Umbilical / Q000175:diagnosis*; D006801:Humans; D008297:Male; D014057:Tomography, X-Ray Computed; D014496:Urachal Cyst / Q000175:diagnosis*