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Gastrointestinal stromal tumor. (a) Endoscopic findings: Flat scar at 13 cm with adjacent tattoos in tortuous rectosigmoid junction; (b) EUS: Hypoechoic mass was found in the perirectal space extending away from lumen but arising from the thickened MP layer; (c) H and E stained biopsy; (d) H and E stained cell block section of the FNA; (e) immunoperoxidase stain for DOG1 is positive in the tumor cells; (f) immunoperoxidase stain for SMA is negative in the tumor cells
