- Characterizing Hypervascular and Hypovascular Metastases and Normal Bone Marrow of the Spine Using Dynamic Contrast-Enhanced MR Imaging
In this study the feasibility of using dynamic postcontrast imaging to separate hypo- and hypervascular spine metastases was assessed. Using a T1 postcontrast sequence with temporal resolution of 6 seconds, the authors imaged spine lesions in 26 patients and from the data collected calculated 3 dynamic parameters. Hypervascular lesions showed steeper and higher wash-in slopes and higher peak enhancement. Conversely, conventional pre- and postcontrast images were unable to differentiate lesions.
- MR Imaging of IgG4-Related Disease in the Head and Neck and Brain
Autoimmune pancreatitis, sclerosing cholangitis and sialoadenitis, retroperitoneal and mediastinal fibrosis, and insterstitial pneumonia are all IgG-4 related disorders. This short article discusses the head and neck manifestations of this disease: orbital pseudotumor and lacrimal gland, cranial nerve, and pituitary involvement. Intracranially, the dura may be also affected. All of these lesions were contrast-enhancing and T2 dark, findings to be kept in mind so that one can suggest their etiology.
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