Mahesh M. Thapa

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Use of CT in the evaluation of suspected appendicitis in children is common. Expanding the use of US would eliminate the radiation exposure associated with CT. We describe new criteria that improve US’s diagnostic accuracy for appendicitis, making it more comparable to CT in terms of sensitivity and specificity. We conducted a retrospective review of 304(More)
Cytomegalovirus (CMV) is a ubiquitous virus that usually results in asymptomatic or clinically benign infection. However, there are two groups of patients whose response to CMV infection is much more severe: those who are infected during fetal development and those who are immunocompromised. Although the manifestations of these types of infection differ,(More)
Leptomeningeal dissemination of low-grade spinal cord gliomas is an uncommon event. The authors report a unique case of leptomeningeal dissemination of a spinal cord pilocytic astrocytoma (PCA) to the intracranial cerebral subarachnoid spaces in a child. A 2-year-old boy presented with a loss of balance and the inability to walk or stand. An intradural(More)
OBJECTIVE Peer review has become an essential component of a comprehensive radiology department quality assurance program. Multiple commercial programs, such as RADPEER, are available to fill this need but may be limited by low radiologist compliance and delayed or limited feedback. Consequently, these peer review programs may not achieve the greater goal(More)
OBJECTIVE The introduction of MDCT has increased the utilization of CT in pediatric radiology along with concerns for radiation sequelae. This article reviews general principles of lowering radiation dose, the basic physics that impact radiation dose, and specific CT integrated dose-reduction tools focused on the pediatric population. CONCLUSION The goal(More)
Craniosynostosis is a common condition in the pediatric age group, which may either be isolated or may present as part of a craniofacial syndrome. This pictorial review illustrates the underlying mechanisms and pathophysiology of craniosynostosis, the various types of craniosynostoses, common craniofacial syndromes and the role of imaging in their diagnosis(More)
The objectives of this article are to review the diagnosis and management of acute nonrenal reactions to iodinated contrast media. We will begin by discussing the types of contrast media and their correlative rates of reaction. The mechanism of contrast reactions, predisposing risk factors, and preventative measures will then be discussed. The remainder of(More)
Developing hyaline cartilage at ends of long bones consists of the epiphyseal, physeal, and articular cartilage components, each of which has specific imaging characteristics that reflect biochemical and macromolecular composition. Standard MR imaging protocols used in adults do not provide sufficient information when used for children, and MR imaging(More)
Osteomyelitis and inflammatory arthritis affect many children. In this article, the authors describe clinical, pathophysiologic, and imaging characteristics of common (and a few not-so-common) conditions in these categories. Emphasis is placed on MR imaging characteristics, but the article discusses other imaging modalities and clinical evaluation when(More)