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Sequential Magnetic Resonance Imaging of an Intracranial Hematoma in a Dog

Shinji Tamura, Yumiko Tamura, Takeshi Tsuka, et al.

Veterinary Radiology & Ultrasound, 2006. 47(2): p.142-144.

An 8-year-old Yorkshire terrier developed acute onset coma and seizure after cranial trauma. Intracranial hemorrhage was suspected from the clinical signs and history. Low-field magnetic resonance (MR) imaging revealed a round mass within the right cerebral hemisphere, compressing the right lateral ventricle and displacing the longitudinal fissure to the left. The lesion was hypointense on T1-weighted images and hyperintense on T2-weighted images, consistent with an acute hemorrhage. MR imaging was performed every 24†h for 6 days from 1†h after the injury, and then on day 14 of hospitalization. With time, the signal intensity changed to hyperintense on T1-weighted images. On T2-weighted images the center of the mass changed to hypointense, and then to hyperintense with a hypointense rim. These changes of signal intensity were related to hemoglobin oxidation.