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AJNR - American Journal of Neuroradiology

Published ahead of print on January 9, 2008
doi: 10.3174/ajnr.A0897

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Malignant Tumors and Chronic Infections in the Masticator Space: Preliminary Assessment with In Vivo Single-Voxel ¹H-MR Spectroscopy

Q. Yu^a, J. Yang^b and P. Wang^a

^a Department of Radiology, Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, P. R. China
^b Division of Oral and Maxillofacial Radiology, Temple University School of Dentistry, and the Department of Diagnostic Imaging, Temple University School of Medicine, Philadelphia, Pa

View larger version (38K): [in this window] [in a new window]   Fig 1. Case 11 with adenoid cystic carcinoma in the right masticator space. Axial T2-weighted image (A) demonstrates that the lesion with high signal intensity is located in the right medial masticator space. The MR spectrum (B) shows a distinct Cho peak at 3.2 ppm. The lipid signals are visible at 0.9–1.5 ppm.

View larger version (32K): [in this window] [in a new window]   Fig 2. Case 15 with rhabdomyosarcoma in the right parotid gland and masticator space. Axial T1-weighted image (A) demonstrates the lesion with intermediate signal intensity in the right parotid gland and masticator space. On the MR spectrum (B), both Cho peak (arrow) and Cr peak (arrowhead) present at 3.2 and 3.0 ppm, respectively.

View larger version (34K): [in this window] [in a new window]   Fig 3. Case 1 with a chronic inflammatory lesion in the right masticator space. Axial T1-weighted image (A) demonstrates that the lesion with isointense signal intensity is located in the right medial masticator space. The box of VOI is positioned in the lesion of the right medial masticator space, and there are no Cho signals present on the spectrum (B). The lipid signals are shown at 0.9–1.5 ppm.