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FIG 2. A–F, T1-weighted (A), SD-weighted (B), T2-weighted (C), FLAIR (D), and GRE (E) MR images and CT scan (F) of parenchymal hemorrhage within the right hemisphere in the same canine. All MR studies were performed 2 hours after ictus and show a focus of low-signal susceptibility artifact near the vertex, which, on the 3-hour CT scan, is found to be iatrogenically introduced gas (arrow). The T1-weighted image (A) does not show the parenchymal hemorrhage, whereas the SD-weighted image shows only vague loss of the gray/white junction (arrowhead, B). T2-weighted (C) and FLAIR (D) images display the heterogeneous hematoma with a ring of low signal (arrowhead) surrounded by vasogenic edema (open arrow). GRE image (E) prominently shows only heterogeneous susceptibility effect in the area of the hematoma (arrowhead), while CT scan shows the typical high-attenuation mass (F).
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