What are calyceal diverticula?
Calyceal diverticula are congenital outpouchings from the calyceal fornices, seen most frequently in the polar regions of the kidneys. They connect by a neck to the fornix they arise from, and the neck can be of variable width. If the neck is narrow, drainage from the diverticula may be impaired and result in complications such as stone formation or infection. A calyceal diverticulum can be confidently diagnosed on the excretory phase of contrast-enhanced CT or MRI, as the diverticulum will fill with excreted contrast material.
