Preschooler with abdominal pain

CT of infected urachal cyst
Axial (left) and sagittal (right) images from a CT with contrast of the abdomen shows a midline cystic lesion with a thick enhancing wall and surrounding inflammatory change just inferior to the umbilicus that appears to course to the dome of the bladder on the sagittal image.

The diagnosis was an infected urachal cyst.