A Case of Systemic AL Amyloidosis Diagnosed by Screening Colonoscopy

Figure 2

Sigmoid colon polypectomy showing benign colonic mucosa with hyperplastic changes and submucosal accumulation of eosinophilic materials, which are S100, CD117, CD34, and SMA negative (excluding neuroma, GIST, and leiomyoma) (a). The material is positive for Congo red stain consistent with amyloids (b).

(a)

(b)