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TitleCreatorSubjectDescription
1 Artifact from Incomplete Orbital Fat Suppression on Magnetic Resonance ImagingMatthew Boyko, MD; Valérie Biousse, MDMagnetic Resonance Imaging; T1; Fat SuppressionOrbital fat has short relaxation times that results in a hyperintense appearance on T1-weighted magnetic resonance imaging (MRI). Fat suppressed T1 MRI sequences are needed to remove the fat signal and better visualize the orbital anatomy, including the optic nerve. Contrast can be used with fat sup...
2 Choroidal Infarction in Giant Cell ArteritisWael A. Alsakran, MD; Andre Aung, MD; Valérie Biousse, MDGiant Cell Arteritis; Ancillary TestingAn 80-year-old Caucasian woman presented with a 10-day history of headaches, intermittent binocular diplopia, and jaw pain. Temporal artery biopsy confirmed a diagnosis of giant cell arteritis. Examination showed characteristic large area of choroidal ischemia that is well-known to be associated wit...
3 MRI Findings in Giant Cell ArteritisWael A. Alsakran, MD; Andre Aung, MD; Valérie Biousse, MDGiant Cell Arteritis; ImagingCase 1. An 80-year-old Caucasian woman presented with a 10-day history of headaches, intermittent binocular diplopia, and jaw pain. Temporal artery biopsy confirmed a diagnosis of giant cell arteritis. MRI with contrast showed enhancement of bilateral optic nerve sheaths in addition to enhancement o...
4 Occipital Hemorrhagic Infarction Secondary to Bacterial Endocarditis-Congruent Homonymous Scotomatous Hemianopic DefectSamuel Bidot, MD; Amit M. Saindane, MD; Valérie Biousse, MDHomonymous Visual Field Defect; Occipital Lobe; Hemorrhage; Hematoma; EndocarditisMRI features of occipital hemorrhage secondary to bacterial endocarditis Figure 1 : Humphrey visual fields showing a congruent homonymous scotomatous hemianopic defect Figure 2 : axial gradient echo T2*w brain MRI Figure 3 : axial T1w and T2w brain MRI Figure 4 : axial postcontrast T1w brain MRI
5 Posterior Cerebral Artery Infarction from Vertebral Artery DissectionKristen Hudson, MD; Valérie Biousse, MDCerebral Infarction; Vertebral Artery Dissection; Homonymous Hemianopia; Posterior Cerebral Artery Occlusion; MRI; DWI; ADC; MRARight posterior cerebral artery ischemic infarction due to post traumatic (martial arts) left vertebral artery dissection with resulting right PCA occlusion. Left homonymous hemianopia due to right occipital lobe infarction and left hemisensory loss due to right thalamic infarction. Imaging of the a...
6 Radiologic Appearance of Unilateral Sphenoid Wing Hypoplasia in Neurofibromatosis Type ISamuel Bidot, MD; Amit M. Saindane, MD; Valérie Biousse, MDSphenoid Bone; Hypoplasia; Neurofibromatosis; Pulsatile ProptosisMRI features of greater wing sphenoid hypoplasia in the setting of neurofibromatosis type 1. - Figure 1 : Orbital MRI with contrast showing right greater sphenoid wing hypoplasia. The lack of bone tissue leads to herniation of the right temporal lobe into the orbit, pushing forward the orbital conte...
7 MRI Characteristics of Cavernous Sinus and Superior Ophthalmic Vein Septic ThrombosisDevin D. Mackay, MD; Valérie Biousse, MDCerebral Venous Thrombosis; Cavernous Sinus Thrombosis; Superior Ophthalmic Vein; MRISeptic left cavernous sinus and superior ophthalmic vein thrombosis, secondary to left maxillary tooth abscess. MRI characteristics. Figure 1 : MRI Orbits (Coronal T2 with fat suppression) : Left periorbital edema (increased T2 signal, yellow arrows) extends inferiorly along the premalar tissues to ...
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