Modified simultaneous integrated boost radiotherapy for an unresectable huge refractory pelvic tumor diagnosed as a rectal adenocarcinoma

Figure 2 Computed tomography image. A: An axial computed tomography (CT) image before radiotherapy. A massive tumor is seen in the perineum, and a part of the tumor is protruding. Both lower extremities are elevated because the patient could not stretch both legs. B: An axial CT image on day 120 from the start of the radiotherapy. The macroscopic tumor disappeared, and the patient could stretch both lower extremities; C: A sagittal CT image before the radiotherapy; D: A part of the bladder wall has been lost to invasion of the massive solid tumor.