MRI: Brain

M-1Isointense to Gray Matter on T1 and T2, Nonspecific Parenchymal Location, Mass Effect
M-2Dark on T1, Bright on T2, Nonspecific Parenchymal Location, No Mass Effect, Nonenhancing
M-3Dark on T1, Bright on T2, Nonspecific Parenchymal Location, No Mass Effect, Enhancing
M-4Dark on T1, Bright on T2, Nonspecific Parenchymal Location, Mass Effect, Nonenhancing
M-4-S1Parenchymal Hemorrhage (See also A-99)
M-4-S2Stages of Hemorrhage (MRI)
M-4-S3Dural Sinus Thrombosis
M-4-S4Causes of Vasculitis
M-5Dark on T1, Bright on T2, Parenchymal, Posterior Paramedian Location, Nonenhancing
M-6Dark on T1, Bright on T2, Nonspecific Parenchymal Location, Mass Effect, Enhancing
M-7Dark on T1 Bright on T2, Subependymal, Nonenhancing
M-8-1Dark on T1, Bright on T2, Subependymal, Enhancing
M-8-2Subependymal Tumor Spread
M-9Dark on T1, Bright on T2, Periventricular, No Mass Effect, Nonenhancing
M-10-1Dark on T1, Bright on T2, Periventricular, No Mass Effect, Enhancing
M-10-2Periventricular Disease In AIDS
M-10-SLeukodystrophies with Macrocephaly (in infants) and Normocephaly
M-11Dark on T1, Bright on T2, Periventricular, Mass Effect, Nonenhancing
M-12Dark on T1, Bright on T2, Periventricular, Mass Effect, Enhancing
M-13-SCauses of Cerebral Emboli
M-13Dark on T1, Bright on T2, Subcortical, No Mass Effect, Nonenhancing
M-14Dark on T1, Bright on T2, Subcortical, No Mass Effect, Enhancing
M-15Dark on T1, Bright on T2, Subcortical, Mass Effect, Nonenhancing
M-16Dark on T1, Bright on T2, Subcortical, Mass Effect, Enhancing
M-17Dark on T1, Bright on T2, Cortical, No Mass Effect, Nonenhancing
M-18Dark on T1, Bright on T2, Cortical, No Mass Effect, Enhancing
M-19Dark on T1, Bright on T2, Cortical, Mass Effect, Nonenhancing
M-20Dark on T1, Bright on T2, Cortical, Mass Effect, Enhancing
M-21Dark on T1, Bright on T2, Basal Ganglia
M-22Dark on T1, Bright on T2, Brain Stem, No Mass Effect, Nonenhancing
M-23Dark on T1, Bright on T2, Brain Stem, No Mass Effect, Enhancing
M-24Dark on T1, Bright on T2, Brain Stem, Mass Effect, Nonenhancing
M-25Dark on T1, Bright on T2, Brain Stem, Mass Effect, Enhancing
M-26-1Cerebellar Mass In A Child
M-26-2Cerebellar Mass In An Adult
M-27Dark on T1, Bright on T2, Cranial Nerve, Enhancing
M-28Dark on T1, Bright on T2, Sella Region Lesion, Sellar/Parasellar Origin, Enhancing
M-29Dark on T1, Bright on T2, Sella Region Lesion, Enlarged Pituitary Stalk, Enhancing
M-30Dark on T1, Bright on T2, Sella Region Lesion, Hypothalamic Origin, Nonenhancing
M-31Dark on T1, Bright on T2, Small Pituitary Lesion, Nonenhancing
M-32Dark on T1, Bright on T2, Pineal Region Tumor
M-33CSF Intensity Lesion, Parenchymal Disease, No Mass Effect
M-34CSF Intensity Lesion, Parenchymal Disease, Mass Effect, Nonenhancing
M-35CSF Intensity Lesion, Parenchymal Disease, Mass Effect, Enhancing Rim Or Nodule
M-36CSF Intensity Lesion, Brain Stem
M-37CSF Intensity Lesion, Sellar/Suprasellar Region
M-38CSF Intensity Lesion, Posterior Fossa
M-39Dark on T1, Dark on T2, Nonspecific Location, No Mass Effect
M-40Dark on T1, Dark on T2, Nonspecific Location, Mass Effect
M-41Dark on T1, Dark on T2, Cortical, No Mass Effect, Nonenhancing
M-42Dark on T1, Dark on T2, Cortical, No Mass Effect, Enhancing
M-43Dark on T1, Dark on T2, Cortical, Mass Effect
M-44Dark on T1, Dark on T2, Basal Ganglia
M-45Dark on T1, Dark on T2, Intravascular
M-46Dark on T1, Dark on T2, Brain Stem
M-47Bright on T1, Bright on T2, Nonspecific Location
M-48Bright on T1, Bright on T2, Sella Region
M-49Bright on T1, Dark on T2, Nonspecific Location
M-50Bright on T1, Dark on T2, Putamen
M-51Bright on T1, Dark on T2, Sella Region
M-52Signal Void, Nonspecific Location
M-53-SDense Intracranial Calcification(s) (See also A-46 to A-50)
M-54Signal Void, Subependymal
M-55Signal Void, Sella Region
M-56Small Ventricles, Small Sulci
M-57-1Symmetrically Enlarged Ventricles, Small Sulci
M-57-2Communicating Hydrocephalus (Obstruction Between Outlet Foramina of Fourth Ventricle and Arachnoidal Villi)
M-57-3Obstructive Hydrocephalus (Obstruction Proximal to Foramina of Luschka and Magendie)
M-58-1Asymmetrically Enlarged Lateral Ventricles
M-58-2Enlarged Temporal Horn (Isolated)
M-59Enlarged Ventricles, Large Sulci
M-60Abnormal Ventricular Configuration
M-61Intraventricular Mass, CSF Intensity
M-62Intraventricular Mass, Dark on T1, Bright on T2, Nonenhancing
M-63Intraventricular Mass, Dark on T1, Bright on T2, Enhancing
M-64Intraventricular Mass, Dark on T1, Dark on T2
M-65Intraventricular Mass, Bright on T1, Dark on T2 Conventional Spin Echo Image
M-66Intraventricular Mass, Bright on T1, Bright on T2
M-67Intraventricular Signal Void
M-68Subarachnoid Space Lesion, Hyperintense to Brain on FLAIR
M-69Subarachnoid Space Lesion, Hyperintense to Brain on T1
M-70Subarachnoid Space Lesion, Isointense to CSF
M-71Subarachnoid Space, Signal Void
M-72Mass In The Cerebellopontine Angle Cistern - Enhancing
M-73Mass In The Cerebellopontine Angle Cistern - Nonenhancing
M-74Focal Leptomeningeal Enhancement
M-75Diffuse Leptomeningeal Enhancement
M-76Pachymeningeal (Dural) Nonenhancing Lesion
M-77Pachymeningeal (Dural) Enhancement
M-78Extraaxial Fluid Collection, CSF Intensity
M-79Extraaxial Fluid Collection, Dark on T1, Bright on T2
M-80Extraaxial Fluid Collection, Dark on T1, Dark on T2
M-81Extraaxial Fluid Collection, Bright on T1, Bright on T2
M-82Extraaxial Fluid Collection, Bright on T1, Dark on T2
M-83Extraaxial Mass, Nonenhancing
M-84Extraaxial Mass, Enhancing
M-85Extracranial Mass, CSF Intensity
M-86Extracranial Mass, Dark on T1
M-87Extracranial Mass, Bright on T1