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Figure 19. (a) T2 weighted sagittal scan with the anterior (midway through the pubic symphysis) and posterior (S2/3 intervertebral joint) radiotherapy limits marked as solid lines. There is a large tumour in the cervix and based on the normal lateral fields, the tumour would be under treated as the uterine fundus lies outside the anterior field. (b) T2 weighted sagittal scan with the anterior and posterior radiotherapy limits marked as solid lines. The tumour-bearing cervix lies centrally and the lateral margins can be narrowed to avoid radiation to vital pelvic structures without under treating the cervical cancer.
