A 16-year-old girl with abdominal pain for 3 years underwent FDG PET/CT scan for evaluating identifiable origin. The images showed multifocal, subcapsular thin-walled low-attenuation masses on CT and focal, slight increased ¹⁸F-FDG uptake on PET with an SUV(max) of 3.0. Based on the findings, malignancy cannot be excluded. Then, pathologic examination was performed, and it was identified to be splenic lymphangioma. We herein presented the FDG PET/CT findings of this splenic lymphangioma, which is a rare benign vascular tumor and commonly caused by congenital malformation of the lymphatic vessels.