Newborn with prenatal hydronephrosis Pediatric Imaging Genitourinary October 31, 2021October 7, 2021 Sagittal US of the kidneys shows multiple echogenic lesions in the renal pyramids bilaterally which resolved on a repeat ultrasound performed one month later. The diagnosis was Tamm Horsfall proteins. Related Published October 31, 2021October 7, 2021