⸻ URINARY CASTS & CRYSTALS ⸻ CASTS Definition Formed only in kidney →

⸻ URINARY CASTS & CRYSTALS ⸻ CASTS Definition * Formed only in kidney → always indicate renal origin * Made by solidification of Tamm Horsfall protein * This protein forms fibrillar meshwork (matrix) → traps cells / debris / fat / pigments ⸻ Structure * Cylindrical structures * Parallel sides + rounded ends * Variable size, shape, appearance ⸻ Cylindroids * Abortive casts * One end → tapered * Other end → rounded * Sides not parallel ⸻ Classification of Casts 1. Based on Matrix * Hyaline * Waxy ⸻ 2. Based on Cells * RBC casts * WBC casts (neutrophils / lymphocytes) * Renal tubular epithelial cell casts * Mixed cellular casts (RBC + neutrophils + epithelial cells) ⸻ 3. Based on Inclusions * Granules (proteins, cell debris) * Fat globules / droplets (triglycerides, cholesterol esters) ⸻ 4. Based on Pigments * Hemoglobin * Myoglobin * Bilirubin * Hemosiderin granules ⸻ TYPES OF CASTS & SIGNIFICANCE Hyaline Cast * Nonspecific * Present even in normal urine * Seen in: * Fever * Congestive heart failure ⸻ Waxy Cast * Seen in: * Chronic glomerulonephritis (CGN) * End-stage kidney disease * Chronic/advanced renal failure * Amyloidosis ⸻ Cellular Casts 1. RBC Cast * Always indicates renal disease * Seen in: * Acute glomerulonephritis (AGN) * Lupus nephritis * Goodpasture syndrome * Subacute bacterial endocarditis * Renal infarction ⸻ 2. WBC Cast * Seen in: * Acute pyelonephritis * AGN (proliferative GN) * Interstitial nephritis ⸻ 3. Epithelial Cast * Seen in: * Acute tubular necrosis (ATN) / injury * Viral infections (e.g., CMV) * Drug-induced injury * Interstitial nephritis * Transplant rejection ⸻ Granular Cast Types: * Coarsely granular * Finely granular Seen in: * Tubular damage * CGN * Nephritis with tubular injury * Renal failure ⸻ Fatty Cast * Seen in: * Nephrotic syndrome * Fabry disease ⸻ Telescoped (Mixed) Sediment * Seen in: * Various nephritis conditions * Proliferative GN (e.g., SLE, polyarteritis nodosa) * Hypersensitivity reactions * Subacute bacterial endocarditis ⸻ Bacterial Cast * Diagnostic of acute bacterial pyelonephritis * Indicates intrinsic renal infection ⸻ Broad Cast (Renal Failure Cast) * Seen in: * Progressive renal failure * Compensatory nephron hypertrophy * Poor prognosis ⸻ CRYSTALS General Points * Usually absent in normal urine * Types depend on urine pH ⸻ Crystals in Acidic Urine 1. Amorphous Urates * Seen in: * Normal acidic urine * Concentrated urine (fever, dehydration) ⸻ 2. Crystalline Urates * Types: * Sodium urate * Potassium urate * Ammonium urate * Seen in normal acidic urine ⸻ 3. Uric Acid Crystals * Seen in: * Normal acidic urine * Post-chemotherapy (lymphoma, leukemia) ⸻ 4. Calcium Oxalate Crystals * Seen in: * Normal acidic urine * Severe chronic renal disease * Poisoning: * Ethylene glycol * Methoxyflurane * Nephrolithiasis (renal stones) ⸻ Disease Associations * Oxalates + urates + cystine → stone formers * Only urates → gout ⸻ pH-Based Classification Acidic Urine * Oxalates * Urates * Cystine ⸻ Alkaline Urine * Phosphates * Calcium carbonate * Ammonium urates ⸻ ULTRA-SHORT REVISION * Cast = kidney origin + Tamm Horsfall protein * RBC cast → glomerular disease * WBC cast → infection/inflammation * Fatty cast → nephrotic * Broad cast → end-stage kidney (bad prognosis) * Crystals depend on pH ⸻ Create image of illlustrated mind map infographics of this given text..

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⸻ URINARY CASTS & CRYSTALS ⸻ CASTS Definition * Formed only in kidney → always indicate renal origin * Made by solidification of Tamm Horsfall protein * This protein forms fibrillar meshwork (matrix) → traps cells / debris / fat / pigments ⸻ Structure * Cylindrical structures * Parallel sides + rounded ends * Variable size, shape, appearance ⸻ Cylindroids * Abortive casts * One end → tapered * Other end → rounded * Sides not parallel ⸻ Classification of Casts 1. Based on Matrix * Hyaline * Waxy ⸻ 2. Based on Cells * RBC casts * WBC casts (neutrophils / lymphocytes) * Renal tubular epithelial cell casts * Mixed cellular casts (RBC + neutrophils + epithelial cells) ⸻ 3. Based on Inclusions * Granules (proteins, cell debris) * Fat globules / droplets (triglycerides, cholesterol esters) ⸻ 4. Based on Pigments * Hemoglobin * Myoglobin * Bilirubin * Hemosiderin granules ⸻ TYPES OF CASTS & SIGNIFICANCE Hyaline Cast * Nonspecific * Present even in normal urine * Seen in: * Fever * Congestive heart failure ⸻ Waxy Cast * Seen in: * Chronic glomerulonephritis (CGN) * End-stage kidney disease * Chronic/advanced renal failure * Amyloidosis ⸻ Cellular Casts 1. RBC Cast * Always indicates renal disease * Seen in: * Acute glomerulonephritis (AGN) * Lupus nephritis * Goodpasture syndrome * Subacute bacterial endocarditis * Renal infarction ⸻ 2. WBC Cast * Seen in: * Acute pyelonephritis * AGN (proliferative GN) * Interstitial nephritis ⸻ 3. Epithelial Cast * Seen in: * Acute tubular necrosis (ATN) / injury * Viral infections (e.g., CMV) * Drug-induced injury * Interstitial nephritis * Transplant rejection ⸻ Granular Cast Types: * Coarsely granular * Finely granular Seen in: * Tubular damage * CGN * Nephritis with tubular injury * Renal failure ⸻ Fatty Cast * Seen in: * Nephrotic syndrome * Fabry disease ⸻ Telescoped (Mixed) Sediment * Seen in: * Various nephritis conditions * Proliferative GN (e.g., SLE, polyarteritis nodosa) * Hypersensitivity reactions * Subacute bacterial endocarditis ⸻ Bacterial Cast * Diagnostic of acute bacterial pyelonephritis * Indicates intrinsic renal infection ⸻ Broad Cast (Renal Failure Cast) * Seen in: * Progressive renal failure * Compensatory nephron hypertrophy * Poor prognosis ⸻ CRYSTALS General Points * Usually absent in normal urine * Types depend on urine pH ⸻ Crystals in Acidic Urine 1. Amorphous Urates * Seen in: * Normal acidic urine * Concentrated urine (fever, dehydration) ⸻ 2. Crystalline Urates * Types: * Sodium urate * Potassium urate * Ammonium urate * Seen in normal acidic urine ⸻ 3. Uric Acid Crystals * Seen in: * Normal acidic urine * Post-chemotherapy (lymphoma, leukemia) ⸻ 4. Calcium Oxalate Crystals * Seen in: * Normal acidic urine * Severe chronic renal disease * Poisoning: * Ethylene glycol * Methoxyflurane * Nephrolithiasis (renal stones) ⸻ Disease Associations * Oxalates + urates + cystine → stone formers * Only urates → gout ⸻ pH-Based Classification Acidic Urine * Oxalates * Urates * Cystine ⸻ Alkaline Urine * Phosphates * Calcium carbonate * Ammonium urates ⸻ ULTRA-SHORT REVISION * Cast = kidney origin + Tamm Horsfall protein * RBC cast → glomerular disease * WBC cast → infection/inflammation * Fatty cast → nephrotic * Broad cast → end-stage kidney (bad prognosis) * Crystals depend on pH ⸻ Create image of illlustrated mind map infographics of this given text..

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