Multiple small medullary renal cysts

What it means

The presence of many cysts in the medulla of the kidney.

This feature is the cardinal sign of medullary cystic disease, also known as medullary sponge disease.

Rare diseases that can present with this1

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Medullary cystic disease · Medullary sponge kidney disease