Persistent diarrhea with petechial rash - unusual pattern of light chain amyloidosis deposition on skin and gastrointestinal biopsies: A case report

Figure 5 Histopathology from colon biopsy. A: H&E stain at 4 × of colon biopsy shows fragments of colonic mucosa with amorphous homogenized pink material; B: Congo red stained colon tissue at 4 × shows the classic salmon-color; C: Congo red stain colon tissue at 4 × under polarization shows apple green birefringence.