Sensitivities for MRI detection of perineural spread of tumor range from 73% to 100% and vary according to the nerve evaluated and timing of imaging relative to tissue sampling [65,104,123-125]. MRI may underestimate microscopic perineural spread of a tumor [123-125]. Advanced imaging techniques such as tractography may be useful to detect perineural tumor spread but require further investigation [130]. Contrast-enhanced PET/MR may detect perineural spread of a tumor and may be useful as an alternate to PET/CT in the evaluation of patients with head and neck cancers [164]. Cranial Neuropathy Sensitivities for MRI detection of perineural spread of a tumor range from 73% to 100% and vary according to the nerve evaluated and timing of imaging relative to tissue sampling [65,104,123-125]. MRI may underestimate microscopic perineural spread of a tumor [123-125]. Advanced imaging techniques such as tractography may be useful to detect perineural tumor spread but require further investigation [130]. Contrast-enhanced PET/MR may detect perineural spread of a tumor and may be useful as an alternate to PET/CT in the evaluation of patients with head and neck cancers [164]. Cranial Neuropathy Supporting Documents The evidence table, literature search, and appendix for this topic are available at https://acsearch. acr.org/list. The appendix includes the strength of evidence assessment and the final rating round tabulations for each recommendation. For additional information on the Appropriateness Criteria methodology and other supporting documents go to www. acr.org/ac. Appropriateness Category Names and Definitions Relative Radiation Level Information Potential adverse health effects associated with radiation exposure are an important factor to consider when selecting the appropriate imaging procedure. Because there is a wide range of radiation exposures associated with different diagnostic procedures, a relative radiation level (RRL) indication has been included for each imaging examination.
Cranial Neuropathy. Sensitivities for MRI detection of perineural spread of tumor range from 73% to 100% and vary according to the nerve evaluated and timing of imaging relative to tissue sampling [65,104,123-125]. MRI may underestimate microscopic perineural spread of a tumor [123-125]. Advanced imaging techniques such as tractography may be useful to detect perineural tumor spread but require further investigation [130]. Contrast-enhanced PET/MR may detect perineural spread of a tumor and may be useful as an alternate to PET/CT in the evaluation of patients with head and neck cancers [164]. Cranial Neuropathy Sensitivities for MRI detection of perineural spread of a tumor range from 73% to 100% and vary according to the nerve evaluated and timing of imaging relative to tissue sampling [65,104,123-125]. MRI may underestimate microscopic perineural spread of a tumor [123-125]. Advanced imaging techniques such as tractography may be useful to detect perineural tumor spread but require further investigation [130]. Contrast-enhanced PET/MR may detect perineural spread of a tumor and may be useful as an alternate to PET/CT in the evaluation of patients with head and neck cancers [164]. Cranial Neuropathy Supporting Documents The evidence table, literature search, and appendix for this topic are available at https://acsearch. acr.org/list. The appendix includes the strength of evidence assessment and the final rating round tabulations for each recommendation. For additional information on the Appropriateness Criteria methodology and other supporting documents go to www. acr.org/ac. Appropriateness Category Names and Definitions Relative Radiation Level Information Potential adverse health effects associated with radiation exposure are an important factor to consider when selecting the appropriate imaging procedure. Because there is a wide range of radiation exposures associated with different diagnostic procedures, a relative radiation level (RRL) indication has been included for each imaging examination.