%0 Journal Article %A Hwan Lee %A Jillian W. Lazor %A Reza Assadsangabi %A Jagruti Shah %T An Imager’s Guide to Perineural Tumor Spread in Head and Neck Cancers: Radiologic Footprints on 18F-FDG PET, with CT and MRI Correlates %D 2019 %R 10.2967/jnumed.118.214312 %J Journal of Nuclear Medicine %P 304-311 %V 60 %N 3 %X Perineural spread (PNS) refers to tumor growth along large nerves, a macroscopic analog of microscopic perineural invasion. This phenomenon most commonly occurs in the head and neck, but its incidence varies with histologic tumor subtype. PNS results from a complex molecular interplay between tumor cells, nerves, and connective stroma. PNS is clinically underdiagnosed despite its impact on patients’ prognosis and management. The role of 18F-FDG PET in assessment of PNS in head and neck cancer remains to be explored, in contrast to MRI as the established gold standard. In patients with PNS, 18F-FDG PET shows both abnormality along the course of the involved nerve and muscular changes secondary to denervation. Assessment of PNS on 18F-FDG PET requires knowledge of relevant neural pathways and can be improved by correlation with anatomic imaging, additional processing of images, and review of clinical context. %U https://jnm.snmjournals.org/content/jnumed/60/3/304.full.pdf