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Recurrence site after chemoradiotherapy using simultaneous integrated boost intensity-modulated radiotherapy (SIB-IMRT) for the patient with cT3N3M0 anal squamous cell carcinoma. (A) Axial, coronal, and sagittal planes with isodose distribution of SIB-IMRT. (B) Intraluminal recurrence image of 18F-fluorodeoxyglucose positron emission tomography/computed tomography and endoscopic images 32 months after chemoradiotherapy using SIB-IMRT.
