Keywords: (11)C-MET; FET; IDLGGs; Incidental findings; Incidentally discovered low-grade gliomas; LGGs; Low-grade gliomas; MRI; MRS; Magnetic resonance imaging; Magnetic resonance spectroscopy; Management protocols; O-(2-[(18)F]fluoroethyl)-l-tyrosine; PET; Perfusion magnetic resonance imaging; Positron emission tomography; T1-weighted image; T1WI; T2-weighted image; T2WI; l-[methyl-(11)C]-methionine; pMRI.