Tamm Horsfall Proteins

Etiology: Tamm-Horsfall proteins are physiologically excreted by the renal tubular epithelium
Imaging US: Concentrated Tamm-Horsfall proteins in renal pyramids may mimic nonobstructing renal stones
DDX: Renal stones, nephrocalcinosis
Complications:
Treatment:
Clinical: Commonly seen on neonatal renal ultrasound and resolve by the end of the neonatal period

Radiology Cases of Tamm Horsfall Proteins

US of Tamm Horsfall proteins — Sagittal US of the kidneys shows multiple echogenic lesions in the renal pyramids bilaterally which resolved on a repeat ultrasound performed one month later.

US of Tamm Horsfall proteins — Sagittal US of the kidneys shows multiple round echogenic foci in the renal pyramids bilaterally.

US of Tamm Horsfall proteins — Sagittal US of the right kidney (above) and left kidney (below) show multiple round echogenic foci in the renal pyramids bilaterally.