Transanal endoscopic microsurgery: The first attempt in treatment of rectal amyloidoma

Figure 1 Computed tomography of the pelvis demonstrates a thickening of the left lower rectal wall with adjacent free gas. No pathologically enlarged lymphadenopathy was found. Arrow mark the extraluminal air or free air in the rectum.

Figure 2 Rectal amyloidoma before transanal endoscopic microsurgery excision (A) and rectal wall after full thickness excision of the mass (B). Little bleeding was noted during and after the procedure.

Figure 3 Five cm amyloidoma specimen excised from the rectum 2 cm from the dentate line (A) and photomicrograph (x 40) demonstrating amyloid deposition with Congo red staining in rectal amyloidoma (B). Amyloid protein is seen as acellular, homogeneous, and eosinphilic material deposited uniformly throughout the mass.