Abstract
Hybrid imaging FDG PET/CT (18F‑fluordeoxyglucose positron emission tomography/computed tomography) has gained increasing importance in oncology in recent years. Afocal increase in FDG uptake in the gastrointestinal tract may be due to colorectal carcinoma. Such afinding requires further clarification. Staging of the primary and locoregional lymph nodes remains adomain of established imaging modalities as FDG PET/CT does not provide aclear additional benefit. Liver metastases can be detected with high sensitivity by FDG PET/CT, but MRI is superior in small lesions. So far FDG PET/CT plays asubordinate role in the radiation therapy planning of rectal cancer. However, it can potentially contribute to the optimization of planning target volumes. FDG PET/CT is suitable for monitoring therapy because morphological and metabolic changes of the tumor can be detected in early stages. This enables early detection of nonresponders after beginning neoadjuvant chemoradiation therapy of rectal cancer. FDG PET/CT can also be used for therapy control of liver metastases, especially after local therapeutic procedures. With clinical suspicion of local recurrence and increased tumor markers, FDG PET/CT is avaluable tool as tumor recurrence can be detected with high sensitivity and specificity.
Published Version
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