A 58-year-old woman presents with nephrotic syndrome (proteinuria 8 g/day, serum albumin 2.1 g/dL) and normal complement levels. Vital signs: BP 148/92, HR 88, RR 16, Temp 37°C, SpO2 98%. She denies recent infections and takes no immunosuppressants. Kidney biopsy shows glomerular deposits. The pathologist suspects amyloidosis. Which stain would demonstrate apple-green birefringence under polarized light microscopy if amyloidosis is confirmed?
- A)Mucicarmine
- B)Congo redGABARITO
- C)Prussian blue
- D)Periodic acid Schiff
- E)Masson trichrome
Explicação
Congo red binds beta pleated sheet structure in amyloid and produces apple green birefringence under polarized light. This is a classic pathologic test for confirming amyloid deposition. Ver explicação completa e trilha adaptativa →