WBC casts

WBC casts (black arrows) in a biopsy specimen of a patient with acute interstitial nephritis. Images courtesy of Patrick Walker, MD.

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Simple renal cysts

Microscopic renal cysts. Note the flattened to cuboidal epithelium lining the cysts. Images courtesy of Patrick Walker, MD.

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Acute interstitial nephritis

Acute interstitial nephritis with associated acute tubular injury. There is interstitial edema and the tubules are not back to back as would be expected, due to the inflammatory and lymphocytic…

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Acute tubular necrosis

Acute tubular necrosis (ATN). Note the tubules are not back-to-back due to interstitial edema (Masson trichrome staining, not shown, did not show appreciable fibrosis). There is blebbing and sloughing of…

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