What's in a Fibril? Amyloid 8-12 nm Congo Red + Randomly arranged Fibrillary GN 12-20 nm Congo Red - Randomly arranged Immunotactoid GN > 30 nm Congo Red - Bundles Collagenofibrotic GN 80 -100 nm Congo Red - Bundles #fibrils #nephrology #diagnosis #amyloid #differential #fibrillary