Medullary nephrocalcinosis due to medullary sponge kidney

Ultrasound of the right (A) and left (B) kidneys shows increased echogenicity of the medulla without shadowing. Axial (C) and sagittal (right, D and left, E) noncontrast CT of the kidneys shows medullary calcifications as well as one left kidney stone (arrow, E). This patient has medullary nephrocalcinosis secondary to medullary sponge kidney.