Comparison of Imaging Findings between Human Papillomavirus-positive and -Negative Squamous Cell Carcinomas of the Maxillary Sinus

OBJECTIVES: This study aimed to assess the efficacy of imaging findings when differentiating between human papillomavirus (HPV)-positive and -negative squamous cell carcinomas (SCCs) of the maxillary sinus. MATERIAL AND METHODS: This study included 37 patients with histopathologically and immunohistochemically confirmed SCCs of the maxillary sinus (three HPV positive and 34 HPV negative). Apparent diffusion coefficients (ADCs), MR signal intensities, CT findings, and maximum standardized uptake (SUVmax) were correlated with the two pathologies. RESULTS: The minimum ADC (ADCmin) was significantly lower in HPV-positive SCCs than in HPV-negative SCCs (0.50 ± 0.02 vs. 0.70 ± 0.13 × 10(−3) mm(2)/s, P < 0.01). The mean ADC (ADCmean) was not significantly different between HPV-positive SCCs and HPV-negative SCCs (0.84 ± 0.07 vs. 0.97 ± 0.18 ×10(−3) mm(2)/s, P = 0.18). The areas under the receiver operating characteristic curves for ADCmin and ADCmean were 0.986 (P < 0.01) and 0.754 (P < 0.05), respectively. The sensitivity and specificity, with a threshold of ADCmin (0.516 × 10(−3) mm(2)/s) for a diagnosis of HPV-positive SCCs, were 100% and 96%, respectively. However, no significant differences were observed in MR signal intensities, CT findings, and SUVmax between HPV-positive and HPV-negative SCCs. CONCLUSION: ADCmin is a useful parameter for the differentiation of HPV-positive and HPV-negative SCCs of the maxillary sinus.