Chemoradiation as definitive treatment for primary squamous cell cancer of the rectum

Figure 1 Pre-treatment computed tomography scans. A: The tumour mass (white arrow) occupying the anterior rectal wall; B: A small, possibly involved node on the left rectal wall (white dashed arrow).

Figure 2 Pre-treatment endorectal ultrasound scan showing the inferior aspect of the mass located 4. 5-5 cm from the anal margin (black arrow).

Figure 3 Computed tomography scan performed after chemoradiation treatment. A: The anterior rectal wall appeared free of disease; B: The previously detected node appeared greatly reduced in size (white arrow).

Figure 4 Endorectal ultrasound performed 12 wk after the end of chemoradiation. The tumour mass appeared reduced in size and hard to identify (white arrow). MA: Margin from anal verge.

Figure 5 Images of proctoscopy (A, B) conducted 4 mo after the end of chemoradiation, which revealed the presence of a plain white scar at the site of previous disease (black arrows).