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Figure 1. CT and MRI images of a primary rectal tumour in the same patient. The primary tumour cannot be clearly delineated and there is insufficient contrast resolution between the primary tumour and the anal sphincter complex on the CT examination. The MR images, however, show tumour clearly in the axial and coronal planes (arrows). The coronal images enable a clear depiction of tumour in relation to the sphincter complex (arrow).

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