Diagnosis: Foramen of Winslow hernia containing incarcerated cecum CT topogram (left image) and coronal IV and oral contrast-enhanced CT (middle image) show dilated, gas-filled cecum (yellow arrows) in the left…
Diagnosis: Perforated duodenal ulcer Axial and coronal oral and intravenous contrast-enhanced CT images show a thickened duodenal wall, with oral contrast extravasating through a wall defect (yellow arrow). There is…
Diagnosis: Meckel’s diverticulitis Axial (left image) and coronal (right image) contrast-enhanced CT images show a large, blind-ending tubular structure to the left of midline with thickened walls (arrows). There is…
Diffusion is a powerful diagnostic tool that measures water molecule displacement of the size order of cell structures (a few micrometers). Hence it is sensitive to microstructural changes in brain…
Diffusion weighted imaging (DWI) is a useful diagnostic tool for central nervous system (CNS) infectious disease, among other pathologies. Meningitis, regardless of its cause, can present subarachnoid hyperintensities on DWI….
Diffusion weighted imaging (DWI) helps differentiate solid from cystic lesions and benign from malignant head and neck lesions. The DWI imaging findings should always be correlated with the morphological anatomical…
Demyelinating lesions can be pathologically heterogeneous, depending on the degree of inflammation, membrane disruption, and type of cellular damage. Demyelinating lesions are more frequently associated with increased diffusion of water…
Diffusion sensitized MRI (dMRI) provides several useful metrics for the detection and characterization of traumatic brain injury (TBI).1 This chapter discusses applications of directionally nonselective dMRI techniques, such as diffusion…
Cytotoxic edema is seen within minutes to hours on diffusion weighted images (DWI) with sensitivity and specificity of 88 to 100% and 86 to 100%, respectively. Cortical watershed infarcts are…
Several forms of edema have been identified under the larger rubric of “brain edema.” These generally fall into the cellular or extracellular forms. Cellular edema denotes cytotoxic edema (CE). Extracellular…
