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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 27:114-122, January 2006
© 2006 American Society of Neuroradiology

HEAD & NECK

A Potential Pitfall of MR Imaging for Assessing Mandibular Invasion of Squamous Cell Carcinoma in the Oral Cavity

A. Imaizumi^a, N. Yoshino^a, I. Yamada^b, K. Nagumo^c, T. Amagasa^d, K. Omura^e, N. Okada^c and T. Kurabayashi^a

^a Department of Oral and Maxillofacial Radiology, Graduate School, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
^b Department of Diagnostic Radiology and Oncology, Graduate School, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
^c Department of Diagnostic Oral Pathology, Graduate School, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
^d Department of Maxillofacial Surgery, Graduate School, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
^e Department of Oral Surgery, Graduate School, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan

Address correspondence to: Tohru Kurabayashi, Oral and Maxillofacial Radiology, Graduate School, Tokyo Medical and Dental University, Yushima 1-5-45, Bunkyo-ku, Tokyo 113-8549, Japan

Abstract

BACKGROUND AND PURPOSE: Whether MR imaging is superior to CT in evaluating the presence and extent of mandibular invasion by squamous cell carcinoma remains controversial. The purpose of this study was to directly compare the diagnostic accuracy of MR imaging and that of CT.

METHODS: MR and CT images in 51 patients with squamous cell carcinoma of the oral cavity were evaluated for the presence and extent of mandibular invasion. The results were correlated with histopathologic findings.

RESULTS: Twenty-five of 51 patients had histopathologic evidence of mandibular cortical invasion. The tumor involved both the cortex and the bone marrow in all 25 patients and involved the inferior alveolar canal in 5 patients. The sensitivity and specificity for mandibular cortical invasion were 96% and 54% for MR imaging and 100% and 88% for CT, respectively. Those for inferior alveolar canal involvement were 100% and 70% for MR imaging and 100% and 96% for CT, respectively. In both evaluations, the specificity of MR imaging was significantly lower than that of CT (McNemar test, P = .004 in the former and P = .002 in the latter). Chemical shift artifact by bone marrow fat was postulated to be the source of most false-positive cases on MR imaging findings for mandibular cortical invasion. Those for inferior alveolar canal involvement were due to MR imaging visualization of the tumor and surrounding inflammation with similar signal intensity.

CONCLUSION: In assessing the presence and extent of mandibular invasion by squamous cell carcinoma, the specificity of MR imaging was significantly lower than that of CT.

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