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OBJECTIVES To investigate the utility of magnetic resonance imaging (MRI) after inconclusive sonography in the evaluation of scrotal disease. METHODS From 1993 to 1999, 622 patients underwent ultrasonography (US) with state-of-the-art equipment to evaluate scrotal diseases. Twenty-six patients, two with bilateral and distinct diseases (age range 1--63(More)
PURPOSE The aim of this study was to evaluate the accuracy of duplex Doppler sonography in diagnosing transplant renal artery stenosis (TRAS) and to determine which parameter is the most reliable for making that diagnosis. METHODS Over a 3-year period, we sonographically evaluated patients who were referred for investigation of possible TRAS. We(More)
"When one admits that nothing is certain one must, I think, also admit that some things are much more nearly certain than others." Bertrand Russell (1872-1970) Computed tomography (CT) is one of the largest contributors to man-made radiation doses in medical populations. CT currently accounts for over 60 million examinations in the United States, and its(More)
PURPOSE To assess the prevalence of orbital invasion by juvenile nasoangiofibroma and to discuss its surgical treatment. METHODS A retrospective review of the medical records and tomographic scans of a case series of 19 patients with juvenile nasoangiofibroma was performed. All scans were reviewed by a radiologist and an orbital surgeon. The presence of(More)
Langerhans Cell Histiocytosis (LCH) is a rare disorder with a great variety of clinical manifestations. The purpose of this retrospective study was to evaluate the pattern and the long-term course of clinical, laboratorial and radiological findings in pediatric-onset LCH. We reviewed 46 children with histological diagnosis of LCH. Ten children (22%) showed(More)
PURPOSE To retrospectively determine the sensitivity and specificity of magnetic resonance (MR) imaging for differentiation between acute and chronic cholecystitis, with histopathologic analysis as the reference standard. MATERIALS AND METHODS Institutional review board approval with waived informed consent was obtained for this HIPAA-compliant study.(More)
Invasive lobular carcinoma (ILC) and lobular neoplasia (LN) are two distinct conditions that still pose challenges regarding to their classification, diagnosis and management. Although they share similar cellular characteristics, such as discohesive neoplastic cells and absence of e-cadherin staining, they represent completely different conditions. LN(More)
In this review we describe the problem of overutilization of high-cost imaging modalities, especially magnetic resonance imaging (MRI) and computed tomography (CT). The overuse of CT is numerically more dramatic and also carries with it the not insignificant risk of harm to patients, namely, induction of radiation-induced malignancies. We report what is(More)
Event-related functional magnetic resonance imaging (ER-fMRI) refers to the blood oxygen level-dependent (BOLD) signal in response to a short stimulus followed by a long period of rest. These paradigms have become more popular in the last few years due to some advantages over standard block techniques. Most of the analysis of the time series generated in(More)