Muddy brown casts in urine
Acute tubular necrosis
Urinary eosinophils, recently started new drug
Acute interstitial nephritis
Anti-PLA2R antibodies
Membranous nephropathy
Coca Cola colored urine
Poststreptococcal glomerulonephritis
Crescent moon shape on renal Bx
Rapidly progressive (crescentric) glomerulonephritis
Wire looping of glomerular capillaries
Diffuse proliferative glomerulonephritis
Tram track on PAS and H&E
Membranoproliferative glomerulonephritis
Congo red stain shows apple-green birefringence under polarized light
Amyloidosis
Antifreeze (ethylene glycol) ingestion
Calcium oxalate stones and anion gap metabolic acidosis
Hexagonal cystine crystals on UA
Nephrolithiasis 2/2 cystinuria