Classically,<unk>  is seen as hyperechoic papillae with clusters of small stones on ultrasound examination of the kidney or with an abdominal x-ray. The irregular (ectatic) collecting ducts are often seen in<unk> , which are sometimes described as having a "paintbrush-like" appearance, are best seen on intravenous urography. However, IV urography has been largely replaced by contrast-enhanced, high-resolution helical CT with digital reconstruction.
Medullary sponge kidney
Medullary cystic kidney disease
Page kidney
Glomerulocystic kidney disease
Autosomal dominant polycystic kidney disease
Horseshoe kidney
Multicystic dysplastic kidney
Cystic nephroma