Dynamic MR imaging in the head and neck.

Abstract

To determine the utility of dynamic magnetic resonance (MR) imaging in evaluation of head and neck lesions. Dynamic MR imaging was performed in 79 head and neck lesions. Five types of time versus signal intensity curves were obtained: type A, curve peaks 0-30 seconds after administration of contrast material; type B, curve peaks at 30-60 seconds; type C, curve peaks at 60-210 seconds; type D, gradual upward slope; and type E, flat. Use of dynamic imaging did not improve the sensitivity of nondynamic imaging for malignancy. Although malignancies had type B, C, or D curves, 39 (68%) of 57 benign lesions had the same patterns. Lesions with type A or E curves and lesions with type D curves and with marked hyperintensity on T2-weighted images were all benign. Although use of dynamic MR imaging contributes little in predicting malignancy in head and neck lesions, it can limit the differential diagnosis and has potential in predicting vascularity and recurrence.