Neuro-imaging - DocNeuro

Functional MRI

Christopher Buckle MD — Thu, 21 Feb 2013 18:06:20 +0000

Functional MRI (fMRI) is a new imaging modality that allows for dynamic evaluation of brain function in addition to structure. In the brain, blood flow is tightly coupled to neuron function. Neurons depend on local blood supply for glucose, so when neurons fire, the local blood flow is increased to provide the glucose necessary for […]

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Nonobstructive Hydrocephalus – Normal Pressure Hydrocephalus

Christopher Buckle MD — Thu, 21 Feb 2013 00:36:31 +0000

The most common cause for enlargement of the ventricles is ex vacuo dilation due to atrophy of the cerebral parenchyma. It is important to distinguish ex vacuo ventricular dilation from true enlargement of the ventricles (hydrocephalus). Diagnosis: Normal pressure hydrocephalus (NPH) Figure 1: (red arrow) temporal horns of the ventricles are dilated out of proportion […]

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Obstructive Hydrocephalus – Colloid Cyst

Christopher Buckle MD — Thu, 21 Feb 2013 00:26:36 +0000

Hydrocephalus refers to enlargement of the ventricular system and two broad categories are recognized – communicating and noncommunicating. Diagnosis: Colloid cyst Figure 1: circumscribed FLAIR hyperintense mass at the foramen of Monroe (a, red arrow) is iso to slightly hyperintense to CSF on T1 sequences (b, blue arrow) and does not enhance on post contrast […]

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Choroidal Fissure Cyst

Christopher Buckle MD — Thu, 21 Feb 2013 00:21:17 +0000

A number of pathological processes affect the limbic system. Patients with longstanding temporal lobe seizures can develop mesial temporal sclerosis, a condition characterized by atrophy of the hippocampus. Neoplasms, both benign and malignant, can also affect the limbic system . Alzheimer’s causes the deposition of beta amyloid beta plaque within the neurons of multiple limbic […]

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Limbic System Anatomy

Christopher Buckle MD — Wed, 20 Feb 2013 23:54:17 +0000

The limbic (derived from the latin limbus, to border or edge) system is a network of structures centered in the medial temporal lobe. These structures or their analogs are found in the brains of even simple organisms making them a part of a phylogeneticaly “old” brain. It is not surprising then that the limbic system […]

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Cavernous Sinus Anatomy

Christopher Buckle MD — Wed, 20 Feb 2013 23:52:18 +0000

Situated in the midline just above the skull base and bridging the sphenoid and temporal bones, the cavernous sinus is a collection of venous channels that serves as a major conduit for venous drainage in the brain. For instance, the cavernous sinus receives venous drainage from superficial cortical veins and the superior ophthalmic vein, draining […]

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Brain MRI Spectroscopy

Naoum P. Issa MD PhD — Tue, 29 May 2012 20:37:10 +0000

What is brain MR spectroscopy used for? MR spectroscopy gives a chemical profile of a region of brain. This is useful in differentiating normal brain tissue from tumor, regions with ischemia, or other tissue abnormalities. Abnormal areas identified on structural MRI are typically compared to the normal contralateral area as a control. A summary of […]

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