SDHD and paraganglioma: A study comparing the sensitivity of functional imaging techniques in the localization of head and neck paragangliomas (harboring SDHD or SDHB mutations) demonstrated that 18F-fluorodihydroxyphenylalanine (18F-FDOPA) positron emission tomography (PET) was the most sensitive study, localizing all tumors, followed by 18F-fluoro-2-deoxy-D-glucose (18F-FDG) PET/CT, which localized 77% of tumors75.