Background and Purpose: It is important to differentiate between tumefactive demyelinating lesions (TDLs) and high grade gliomas to avoid unnecessary surgical procedures. However, this can be difficult on conventional MR imaging alone. Although MR perfusion weighted imaging has been reported to improve the accuracy of the diagnosis, this technique is limited in clinical practice since some pati...

OBJECTIVE In this article we will illustrate the role of subtraction imaging for abdominal MRI applications. CONCLUSION Subtraction imaging has multiple applications for imaging the mediastinum, abdomen, and pelvis. Removing any preexisting signal of T1 unenhanced images causes contrast enhancement within a mass to become more conspicuous on subtracted sequences. This is helpful when evaluati...

Ring enhancement with contrast material is a nonspecific computed tomographic finding seen in a variety of lesions, including benign and malignant neoplasms, inflammation, infarction, and hematoma. This lack of specificity is especially troublesome in the differentiation of self-limiting disorders (infarction and hematoma) from progressive processes (tumor or abscess) potentially requiring surg...

BACKGROUND The purpose of this prospective study was to evaluate the feasibility of replacing intravenous urography (IVU) with unenhanced computed tomography (CT) as the first line diagnostic modality for acute renal colic in the emergency department. METHODS In the 1-year study period, 82 patients who presented themselves to the emergency room with acute renal colic and who were suspected to...

PURPOSE To assess detection of stroke and prediction of extent of infarction with multimodal computed tomographic (CT) evaluation (unenhanced CT, perfusion CT, and CT angiography) in patients suspected of having acute stroke. MATERIALS AND METHODS Forty-four consecutive patients with a mean National Institutes of Health Stroke Scale score of 10.45 and suspected of having ischemic stroke of th...