- Yield of CT Angiography and Contrast-Enhanced MR Imaging in Patients with Dizziness
Which is the preferred imaging modality in patients presenting with isolated dizziness? These authors retrospectively evaluated CTA, contrast-enhanced MRI of the brain, and contrast-enhanced MRI of the internal auditory canals and temporal bones in a large group of patients and showed that all 3 are unlikely to identify significant findings that will lead to a change in clinical management in this situation.
- 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.
- Retinoblastoma: Value of Dynamic Contrast-Enhanced MR Imaging and Correlation with Tumor Angiogenesis
Fifteen patients with retinoblastoma were assessed with dynamic contrast-enhanced MRI over a period of 8 minutes; late contrast enhancement was also studied. The authors found that during the early phase of the perfusion studies the time curve correlated with microvessel density whereas late enhancement correlated with tumor necrosis. Thus, dynamic contrast-enhanced MRI may be used to assess angiogenesis and necrosis and may be used to monitor treatment.
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