PT  - JOURNAL ARTICLE
AU  - Lee, Hwan
AU  - Lazor, Jillian W.
AU  - Assadsangabi, Reza
AU  - Shah, Jagruti
TI  - An Imager’s Guide to Perineural Tumor Spread in Head and Neck Cancers: Radiologic Footprints on <sup>18</sup>F-FDG PET, with CT and MRI Correlates
AID  - 10.2967/jnumed.118.214312
DP  - 2019 Mar 01
TA  - Journal of Nuclear Medicine
PG  - 304--311
VI  - 60
IP  - 3
4099  - http://jnm.snmjournals.org/content/60/3/304.short
4100  - http://jnm.snmjournals.org/content/60/3/304.full
SO  - J Nucl Med2019 Mar 01; 60
AB  - 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.