# A Mysterious Trigger for Serum Amyloid A (SAA)-Associated Amyloidosis: Insights From an Autopsy Study

## TL;DR

A rare case of amyloidosis linked to chronic lung disease and alpha-1 antitrypsin deficiency is reported, offering new insights into its causes.

## Contribution

Identifies alpha-1 antitrypsin deficiency as a potential trigger for SAA amyloidosis in a young patient with cystic bronchiectasis.

## Key findings

- Autopsy revealed alpha-1 antitrypsin deficiency as the cause of chronic inflammation leading to amyloidosis.
- Sustained elevation of serum amyloid A due to lung disease likely caused amyloid deposition.
- Case highlights a rare and previously unreported etiology for SAA-associated amyloidosis.

## Abstract

Amyloidosis refers to a heterogeneous group of disorders characterized by the extracellular deposition of insoluble fibrillar proteins, leading to tissue damage and functional impairment. Among these, serum amyloid A (SAA) amyloidosis, previously termed secondary amyloidosis, arises in the context of chronic inflammatory conditions. While common causes include autoimmune diseases and chronic infections, the underlying etiology remains unidentified in a subset of cases. We report a rare case of SAA-associated amyloidosis in a 29-year-old male with a history of childhood-onset cystic bronchiectasis. The patient presented with progressive renal dysfunction and was diagnosed with systemic amyloidosis based on histopathological evaluation. Common autoimmune and infectious etiologies were excluded during life. An autopsy revealed alpha-1 antitrypsin deficiency as the underlying cause of chronic pulmonary inflammation, manifesting as cystic bronchiectasis, which likely triggered sustained elevation of serum amyloid A and subsequent amyloid deposition.