Tanyaluck ThientunyakitSze Ting LeeSam BerlangieriMahidol UniversityAustin Hospital2018-06-112018-06-112012-01-01Clinical Nuclear Medicine. Vol.37, No.1 (2012), 91-9215360229036397622-s2.0-84863025781https://repository.li.mahidol.ac.th/handle/20.500.14594/15062A 79-year-old man with diffuse large B-cell lymphoma was presented for assessment of metabolic response to chemotherapy. The baseline F-18 FDG PET showed extensive nodal, soft tissue, and bone metastases, which have completely resolved on the subsequent follow-up study, except for persistent perianal FDG activity. The perianal FDG activity was explained by inflammatory changes, secondary to hemorrhoids evident on the corresponding contrast-enhanced CT study. This exemplified the application of FDG PET/CT in detecting benign inflammatory disorders and the importance of correlation with CT to minimize misdiagnosis of residual malignancy. Copyright © 2012 by Lippincott Williams and Wilkins.Mahidol UniversityMedicineArticleSCOPUS10.1097/RLU.0b013e3182336004