Hyaline accumulation and its organ manifestation

1. Definition

• Hyaline = a descriptive term for homogeneous, glassy, pink (eosinophilic) material on H&E.
• Located intracellularly or extracellularly; a non-specific reaction pattern, not a single disease.

2. Organ Manifestations

Kidney

• Hyaline arteriolosclerosis: plasma protein leakage across endothelium + ↑ECM by SMCs → wall thickening, luminal narrowing → ischemia.
  • Associated with diabetes mellitus (metabolic/chemical injury) and hypertension (hemodynamic/pressure injury).
  • → benign nephrosclerosis → small, shrunken kidney.
• Hyaline glomeruli: plasma protein leakage + ECM + hyaline precipitation (e.g. glomerulonephritis) → obliterated glomeruli (end-stage kidney).

Liver

• Mallory hyaline (alcoholic hyaline): red globular intracytoplasmic material in hepatocytes; chronic alcoholism (toxic effect).

Lung

• Hyaline membrane disease: alveolar injury + plasma leakage → membrane-like exudate (fibrin, fibrinogen, cell debris, plasma proteins) lining alveoli; seen in IRDS / ARDS.

💡 High-yield: Hyaline is glassy pink material — contexts: hyaline arteriolosclerosis (HTN/DM), Mallory bodies (alcoholic hepatitis), hyaline membranes (IRDS/ARDS). Distinguish from amyloid (Congo red, apple-green birefringence) and fibrinoid necrosis (immune vascular injury).