PMC4746848_01
Maximum intensity projection, (a) coronal fused (b) and axial fused (c) images of initial fluorodeoxyglucose positron emission tomography/computed tomography show a few fluorodeoxyglucose-avid retroperitoneal lymph nodes (arrows), with no definite abnormality in the large intestine
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F1
FDG PET/CT was performed to look for any inflammation in the large bowel [Figure 1a-c]. A few FDG avid retroperitoneal lymph nodes were detected [arrows in Figure 1], with no definite abnormality in the large intestine.
Maximum intensity projection, (a) coronal fused (b) and axial fused (c) images of second fluorodeoxyglucose positron emission tomography/computed tomography show diffusely increased fluorodeoxyglucose uptake in homogeneous mural thickening involving the entire large intestine and intensely fluorodeoxyglucose-avid multiple segmental strictures (arrows). No abnormal extra-intestinal fluorodeoxyglucose uptake is seen in the maximum intensity projection image
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F2
With his symptoms persisting for more than 6 months, FDG PET/CT [Figure 2a-c] was repeated 18 months after the first scan to rule out malignant transformation in the sigmoid colon, after stopping oral steroids for 15 days. The scan showed intensely FDG avid multiple segmental strictures [arrows in Figure 2] located closely in the ascending colon and approximately every 5 cm in the transverse colon, descending colon and sigmoid colon, the longest measuring 7 cm.