Urachal Sinus Complicated by an Umbilical Abscess.

The urachal sinus is a vestigial remnant that ensues in the aftermath of incomplete obliteration of the embryonic urachus. Urachal sinuses often remain asymptomatic, being discovered incidentally in instances where they are complicated with a superimposed infection or abscess. Due to their rare occurrence in adults, urachal sinuses are rarely included in the list of differential diagnosis surrounding umbilical pain in adult patients. We hereby delineate a unique case of a urachal sinus in a 26-year-old male patient. Due to the presence of an abscess in a hirsute male, a presumptive diagnosis of an umbilical pilonidal sinus was suspected. However, further diagnostic workup divulged an unequivocal diagnosis of a urachal sinus complicated by an abscess formation.