Axial T1-weighted images of the brain in a patient with hype | Figure 1

CincyKidsRad

Cincinnati Children's Radiology

Axial T1-weighted images of the brain in a patient with hypermagnesemia and manganese toxicity show symmetric T1 hyperintense signal in the dentate nucleus (arrows, image 1), dorsal brainstem (arrow, image 2), cerebral peduncles (arrows, image 3), and globus pallidus (arrows, image 4). Manganese toxicity can cause symptoms similar to Parkinson's disease; the most common cause of negative toxicity is due to occupational exposure. However, genetic defects can cause an inborn error of manganese metabolism. #NeuroWednesday


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Axial FLAIR (image 1) and sagittal T1 FLAIR MRI images show a hypothalamic hamartoma (arrow). Patients with these lesions classically present with gelastic or laughing seizures. Hypothalamic hamartomas may also cause symptoms such as precocious puberty or behavioral and cognitive difficulties. On imaging, hypothalamic hamartomas are isointense to gray matter on T1-weighted images and hyperintense on T2-weighted images, without enhancement after contrast administration.


Axial T1 postcontrast MRI shows a large meningioma (arrow, image 1) near the vertex. More inferiorly (image 2), there is also a meningioma at the base of the skull at the sella (arrow, image 2). A large right vestibular schwannoma (arrowhead) is also present. Neurofibromatosis type II is associated with multiple schwannomas, meningiomas, and ependymomas. Meningiomas can cause cortical thickening and irregularity. #FridayQuizDay #FridayQuiz


t2 hyperintens(first image) T1 hypointens(second image) and postcontrast t1 hypointens( last image ) showing a tiny cystic lesion. What could that be? (blue arrow=neurohyposis)

\Coronal T1-weighted MRI displays an amorphous area of increased T1 signal (arrow) within the left mesial temporal lobe. Which types of tissue exhibit high intensity on T1-weighted images?

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