Fig. 2

Persistent amyloid deposition on colon biopsy and the therapeutic course. a The first colon biopsy showed positive staining with Congo red at mucosal muscle plates and lamina propria. b The second biopsy showed that the amyloid deposition remained. c The patient’s clinical course shows that the gastrointestinal symptoms were alleviated and proteinuria gradually resolved after TCZ was initiated (original magnification, a, ×260, b, ×520)