Medullary sponge kidney
- Medullary sponge kidney is a developmental abnormality occurring in the medullary pyramids of the kidney.
- Characterized by cystic dilatation of the collecting tubules in 1 or more renal pyramids in 1 or both kidneys.
- Most patients with medullary sponge kidney remain asymptomatic throughout life, and the condition is discovered incidentally
- Complications such as infection, hematuria, and nephrolithiasis may be the presenting complaint in approximately 10% of patients.
- The frequency of calculus disease is increased and manifested by hematuria, renal colic, flank pain, fever, and dysuria.
 Imaging Findings
- Unenhanced CT scan findings may be normal or demonstrate medullary nephrocalcinosis.
- Enhanced scans may demonstrate contrast accumulation within the papillae.
- Echogenic medullary pyramids in patients with medullary sponge kidney, irrespective of the presence of medullary nephrocalcinosis.
- US findings can demonstrate complications related to calculus disease.
 See Also
 External Links
- Khan, Ali Nawaz. E-medicine radiology article