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Variation of mesorectal volume with abdominal fat volume in patients with rectal carcinoma: assessment with MRI

Department of Radiology, Hammersmith Hospitals NHS Trust, Charing Cross Hospital, Fulham Palace Road, London W6 8RF, UK

View larger version (61K): [in this window] [in a new window]   Figure 1. Axial MR whole pelvis spin echoT1 weighted sequence images in a patient with rectal cancer. (a) The outer margin of the mesorectal fascia was defined on MRI as the fine hypointense linear structure (arrows) enveloping the mesorectum. (b) Measurement of the whole mesorectal fascial area was performed by planimetry. Employing workstation specific software, this measurement was obtained using an electronic cursor and a mouse to draw a freehand region of interest (ROI) along the mesorectal fascia, which was located by eye.

View larger version (49K): [in this window] [in a new window]   Figure 2. On an axial MR whole pelvis spin echoT1 weighted sequence image at the level of the L5/S1 disc space, a measurement of total abdominal area was obtained using the electronic cursor and a mouse to draw a freehand region of interest (ROI). (a) This was performed along the entire abdominal circumference, and also (b) the visceral compartment circumference.

View larger version (6K): [in this window] [in a new window]   Figure 3. (a) Correlation between average mesorectal axial area and visceral compartment area in females (r = 0.65, p = 0.002). (b) Correlation between mesorectal volume and visceral compartment area in females (r = 0.65, p = 0.002).

View larger version (6K): [in this window] [in a new window]   Figure 4. (a) Correlation between average mesorectal axial area and visceral compartment area in males (r = 0.67, p = 0.018). (b) Correlation between mesorectal volume and visceral compartment area in males (r = 0.68, p = 0.016).