PS02.063: FALSE POSITIVE CASES OF FDG-PET/CT IN METASTASIS OF ESOPHAGEAL SQUAMOUS CELL CARCINOMA

Abstract

Abstract Background PET-CTs are useful for diagnosing primary and metastatic lesions of esophageal cancer. Although the number of cases are few, false positives exist in which an inflammatory tumor mass and a non-specific tumor mass are difficult to differentiate. Methods The subjects had suspected metastasis from a PET-CT which occurred before the operation of esophageal cancer. However, after surgery, biopsy and/or follow-up observation, only the cases that were confirmed as metastasis negative were considered to be PET-CT false positives. Results There were three cases of preoperative PET/CT false positives. Bone metastasis was originally suspected in two cases, but they were later found to be bone metastasis negative after a preoperative bone biopsy and clinical course observation. The other cases suspected of mediastinal lymph node metastasis was diagnosed as inflammatory lymphadenopathy by a pathological examination. Conclusion Conducting a PET/CT is useful when diagnosing esophageal cancer metastasis, but there should be an awareness of the possibility of false positives. Disclosure All authors have declared no conflicts of interest.