MRI CAMRT: Pathology Exam solved 100%

MRI CAMRT: Pathology Exam solved 100% Abscess (brain): definition and imaging appearance on T1, T2, CE, and DWI -Correct Answer-Collection of pus. Mass effect and extensive surrounding edema. T1: hypointense to grey matter T2: hyperintense to grey matter with surrounding edema. CE MRI: ring-like enhancement DWI shows an abscess having a high DWI signal with corresponding low signal on the ADC map. Avascular Necrosis (AVN) -Correct Answer-T1: necrotic area is hypointense T2: hyperintense bone marrow edema Ischemic area remains hypointense. Double line sign. Hypointense outer line due to sclerosis and fibrosis and a hyperintense inner line. Acoustic neuroma: AKA? Benign or malignant? Appearance on T1, T2, CE? -Correct Answer-AKA vestibular schwanoma Benign tumour of schwann cells covering the vestibule portion of the 8th cranial nerve (vestibulocochlear nerve). Seen in the cerebellopontine angle cistern T1: isointense to slightly hypointense T1 CE: hyperintense enhancement T2: Hyperintence Agenesis of the corpus callosum: definition and appearance -Correct Answer-the congenital absence of corpus callosum which may be partial or complete due to an insult occurring prior to 10th week gestation. Elevated 3rd ventricle, noticeable separation of the lateral ventricles, partial or complete absence of the corpus callosum and dysplasia of the cerebellum. Ventricles may be enlarged Alzheimer's disease: Appearance, and spectroscopy -Correct Answer-Diffuse cortical atrophy, most prominent in the temporal lobes. Hippocampal atrophy may be seen Increase in the size of the ventricles, sulci, sylvian fissures, and total CSF volume. Reduced levels of N-acetyl asparate (NAA) Increased levels of myoinositol Aneurysm (brain): causes, location, T1, T2 appearance -Correct Answer-Berry aneurysms are small saccular aneurysms that commonly form on th earteries of the COW. Can be associated with PKD and coarctation of the aorta. Often asymptomatic/incidental finding. Often rupture and cause subarachnoid hemorrhage. T2: Rou