A mixed inflammatory cell infiltrate in a child with acute interstitial nephritis. Image courtesy of Patrick Walker, MD.
WBC casts
WBC casts (black arrows) in a biopsy specimen of a patient with acute interstitial nephritis. Images courtesy of Patrick Walker, MD.
Autosomal recessive polycystic kidney disease (ARPKD)
Gross pathology and low-power light microscopy of kidney tissue in a neonate with ARPKD. The kidneys are enlarged but maintain their reniform shape, and are full of microscopic cysts derived from dilated distal tubules and cortical collecting ducts. Images courtesy of Patrick Walker, MD.
Simple renal cysts
Microscopic renal cysts. Note the flattened to cuboidal epithelium lining the cysts. Images courtesy of Patrick Walker, MD.