Radiology MRI

Incidental finding on CT Angiography showing aberrant right subclavian artery that exits aorta dorsally to esophagus (arrow). In this case no significant compression on esophagus or trachea is seen. Aberrant Right Subclavian Artery is also known as Arteria Lusoria . Sometimes it can run between trachea and esophagus. Also note interesting anatomical configuration in the upper mediastinum showing: RCCA - Right Common Carotid Artery T - Trachea LCCA - Left Common Carotid Artery LSA - Left Subclavian Artery E - Esophagus AL - Arteria Lusoria

Snow is melting. Searching for mice. Digging. Looking. Badger has woken up. Sunbathing. Lizzard has also woken up.

Axial susceptibility weighted image (SWI) shows hemorrhage in the right inferior frontal gyrus with hypointense rim consistent with hemosiderin and central hyperintensity due to extracellular methemoglobin. The high signal intensity is also seen on the coronal nonenhanced T1. Diffusion weighted image (DWI) shows high signal and low on the corresponding ADC map which is consistent with restricted diffusion due to extracellular methemoglobin. There is also focal hemosiderin deposit in the left parietal lobe - shown on SWI, as well as many other smaller hemosiderin foci (not shown). Patient is suspected for amyloid angiopathy or multiple cavernomas.

Noncontrast CT shows reduced differentiation between cortex and white matter as well as subtle hypodensity in the left parietal lobe. Finding of acute infarct in the posterior territory of the arteria cerebri media. Blood Flow CT Perfusion shows markedly reduced flow (blue). Blood Volume shows reduced blood volume (blue). Mean Transit Time shows increased transit time in the left parietal lobe (blue). Remember - in CT Perfusion: "Blue is Bad" . See also my notes about CT Perfusion . Interesting new article in Radiology: Certainty of Stroke Diagnosis: Incremental Benefit with CT Perfusion over Noncontrast CT and CT Angiography by Julia Hopyan

Axial and sagittal T2, axial FLAIR and sagittal T1 with Gado show mass in the cerebellum presenting with widened folia and striated appearance. No contrast enhancement. Lhermitte-Duclos disease is also known as Dysplastic Cerebellar Gangliocytoma. This patient also has Multiple Sclerosis.

Subcondylar mandibula fracture with dislocation. Note added value of 3D reconstructions showing position of the fractured condyle. There is also a not closed arch C1 dorsally - a common normal anatomic variant (Spina Bifida Occulta).