Pathophysiology of sensorineural hearing loss in jugular foramen paraganglioma.

OBJECTIVES/HYPOTHESIS: Pathologic involvement of the inferior cochlear vein is a mechanism of sensorineural hearing loss in patients with jugular foramen paraganglioma. STUDY DESIGN: Retrospective case-control study. METHODS: The presenting audiograms, magnetic resonance imaging, and computed tomography were reviewed in 46 subjects with jugular foramen paragangliomas. Four-frequency bone conduction average was compared between the tumor and nontumor ears in each subject to establish the presence of sensorineural hearing loss. Imaging findings for each subject were recorded. Univariate and multivariate statistical analyses were performed to determine which radiographic features were associated with sensorineural hearing loss. Hearing data were analyzed as a continuous variable and as a categorical variable. RESULTS: Twenty subjects (43.4%) had a bone-conduction pure-tone asymmetry of greater than 15 dB. Inferior cochlear vein involvement was identified in 19 of the 20 (95%) subjects with sensorineural hearing loss. Inferior cochlear vein involvement was found to be a statistically significant predictor of sensorineural hearing loss using univariate and multivariate analyses. Other imaging findings that were statistically significant predictors of sensorineural hearing loss include Glasscock-Jackson stage, Fisch-Mattox stage, hypoglossal canal involvement, jugulo-carotid spin erosion, and petrous carotid canal erosion. CONCLUSIONS: Involvement of the inferior cochlear vein appears to be a plausible mechanism for sensorineural hearing loss in patients with jugular foramen paraganglioma. LEVEL OF EVIDENCE: 4 Laryngoscope, 129:67-75, 2019.

Influence of smoking history on imaging characteristics among patients with human papillomavirus-positive oropharyngeal cancer: a blinded matched-pair analysis.

BACKGROUND AND PURPOSE: Human papillomavirus (HPV)-positive oropharyngeal cancers represent a distinct clinical entity with more favorable prognosis than do HPV-negative oropharyngeal cancers. However, among patients with HPV-positive oropharyngeal carcinomas, those with a significant smoking history have a much worse prognosis. Recently, imaging characteristics of oropharyngeal cancers were identified as markers of poor prognosis. The purpose of this study was to determine whether nodal imaging characteristics differ between smokers and never/light smokers with HPV-positive oropharyngeal cancer. MATERIALS AND METHODS: A review of 130 pretreatment computed tomographic examinations of HPV-positive oropharyngeal cancers in smokers (>10 pack-years) and never/light smokers (10 pack-years) matched for T stage and tumor subsite was performed, with the reviewing radiologist blinded to the HPV status, smoking history, and clinical stage. Additionally 24 pretreatment computed tomographic examinations of patients with HPV-negative oropharyngeal cancers were also reviewed in a blinded fashion. Imaging characteristics of metastatic nodal disease were compared using the testing (Fisher exact testing where appropriate) and McNemar testing for the matched-pair analysis. RESULTS: As expected, those with HPV-positive oropharyngeal cancer were more likely to be younger, male, non-Hispanic white, never/former smokers, and never drinkers than were those with HPV-negative oropharyngeal cancer. Furthermore, the HPV-positive oropharyngeal cancers were more likely to be in the tonsil, smaller T category, higher N category, poorly differentiated, than were the HPV-negative oropharyngeal cancers. However, among the HPV-positive oropharyngeal cancers, we could identify no obvious difference in the pretreatment imaging characteristics of paired smokers and never/light smokers. CONCLUSIONS: Among the patients with HPV-positive oropharyngeal cancer, no imaging characteristics were identified to correlate with the critical prognostic feature smoking status. Cystic and necrotic nodal metastases, as described previously, were more common among the patients with HPV-positive than those with HPV-negative oropharyngeal cancers. Although cystic nodal metastases were more common among the never/light smokers with HPV-positive oropharyngeal cancer than among smokers with HPV-positive oropharyngeal cancer, however, because these results did not reach statistical significance, we concluded that the imaging results cannot serve as a surrogate for an HPV-driven phenotype.