PMC9047891_01
A) A puncture line was drawn on the coronal image of the planning computed tomography. B-G) The marker (+) on the puncture line was shown on each axial image. During puncture the axial images served as the reference images
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C-reactive protein was 7.7 mg/dl. Contrast-enhanced CT scans showed rectal cancer recurrence with subepithelial invasion; there was an abscess on the ischiorectal fossa close to the tumour (Figure 1A). As shown in Figure 1A-G, we drew a line from the puncture to the target point on coronal images of planning CT scans.
Three simultaneous computed tomography (CT) fluoroscopy images acquired during puncture are shown. Step 1: The needle tip was placed at the most caudal side of the 3 images. Step 2: With reference to the marker on the same axial level of the planning CT, the needle was advanced 4 mm at a time until the needle tip was seen on the middle image. Step 3: Then the needle was advanced another 4 mm until its tip was seen on the cranial image. Step 4: Thereafter the CT gantry was moved 8 mm to the cranial side to see the needle tip on the caudal image, and the steps were repeated until the target was reached
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Figure 2 shows the details.
The drainage tube was placed cranio-caudally to the abscess on the coronal non-contrast computed tomography image
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Tokyo, Japan) in the abscess on the ischiorectal fossa (Figure 3) and drained it.