fig 7.

Fig 10. Imaging of an 80-year-old woman after radiation therapy for squamous cell carcinoma of the tongue is shown.

A, T2-weighted Turbo SE image shows small high-signal intensity mass (arrowhead) adjacent to pyriform sinus that was difficult to discern on T1-weighted images. Endoscopic examination of this region was performed twice, yielding no abnormal findings.

B, T2-weighted Turbo spin-echo image (200/105/2/17 [TR/TE/NSA/ETL]) obtained with 59-s scanning time shows needle (arrow) with tip positioned within solid anterior portion of lesion. Cytologic analysis revealed squamous cell carcinoma.

Reproduced with permission from reference 27.

Fig 11. MR-guided sclerotherapy performed in a 31-year-old man with a large, low-flow vascular malformation in the right masticator space. A single frame from a continuous series of FISP images (18/7/1/90°[TR/TE/NSA/flip angle], 1.8-s scanning time) obtained during treatment session shows needle placed from a paramaxillary approach into the deep right masticator space (arrowheads). Collection of high signal around needle tip represents a mixture of sclerosing and contrast agents (arrow). The needle was repositioned interactively until the entire targeted portion was injected. Follow-up images revealed thrombosis and fibrosis of the malformation, and symptoms of bleeding on dental manipulation and inability to open mouth completely resolved after treatment.