Multiple Sclerosis Like Lesions

Multiple sclerosis MS is a clinical diagnosis that should never be made using neuroimaging alone. In 78-95 of clinically diagnosed MS patients, gadolinium-enhanced magnetic resonance imaging MRI features include ovoid periventricular, infratentorial, temporal lobe, and corpus callosum white matter lesions that are isointense to hypointense on Tl-weighted images, and show high intensity on proton density and T2-weighted images. Many conditions have to be taken into account in the differential...

Meralgia Paresthetica Bernhardt Roth syndrome

The lateral cutaneous nerve is a purely sensory branch arising from the lumbar plexus L2-L3 . It passes obliquely across the iliac muscle, and enters the thigh under the lateral part of the inguinal ligament. It supplies the skin over the anterolateral aspect of the thigh. Meralgia paresthetica is a condition caused by entrapment of this nerve as it passes through the opening between the inguinal ligament and its attachment 1 - 2 cm medial to the anterior superior iliac spine. Numbness is the...

Causes of Horners Syndrome

Horner's syndrome is an interruption of the sympathetic supply to the eye, resulting in the classic triad of ptosis, miosis, and anhydrosis. - Amyotrophic lateral sclerosis or Lou Gehrig disease Hypothalamus to upper thoracic cord E.g., hemispherectomy massive infarction may cause The sympathetic and spinothalamic pathways in the brain stem lie throughout their course next to each other. Horner's syndrome here is therefore frequently associated with contralateral pain and temperature loss E.g.,...

Fig 1 Suprasellar lesions neoplastic

Coronal T1 WI with a pituitary macroadenoma in close relationship with the optic chiasm presenting a heterogeneous, post-contrast high intensity signal. 3. Pituitary macroadenoma. Sagittal T1 WI shows a pituitary tumor with a heterogeneous postcontrast high intensity signal with cystic and or necrotic features in its posterior section filling the suprasellar cisterns and exerting compression on the optic chiasm. 4, 5. Craniopharyngioma. A suprasellar...

Postoperative Brain Scar Versus Residual Brain Tumor

Extracellular Methemoglobin Mri

There is nothing more frustrating for the neurosurgeon than a postoperative CT scan or MRI showing residual tumor after a supposedly complete resection. Granulation tissue, which enhances on CT and MRI due to its fi-brovascular nature, develops 72 hours after surgery. After that time, it is consequently difficult to distinguish between enhancing surgical bed tissue and marginal residual tumor, assuming that there was preopera-tive tumor enhancement. The scan enhancement may persist for several...