quadrigeminal


Also found in: Medical.

quadrigeminal

(ˌkwɒdrɪˈdʒɛmɪnəl) or

quadrigeminous

adj
1. (Anatomy) anatomy obsolete of or relating to a group of four muscles which rotate the thigh laterally
2. (Anatomy) anatomy zoology of or relating to two pairs of protuberances in the tectum of the mammalian midbrain
3. (Zoology) anatomy zoology of or relating to two pairs of protuberances in the tectum of the mammalian midbrain
4. (Medicine) med of or relating to cardiac arrhythmia in which heartbeats occur in groups of four
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While hyperintensity is seen in medial thalamic and periacuaductal gray matter on T2 and FLAIR sequences of cranial Magnetic Resonance Imaging (MRI) in acute cases, atrophy in mamillary bodies, enhanced signaling in the base of fourth ventricle, midline of cerebellum may be seen in chronic cases and contrast enhancement may occur in mamillary bodies and inferior quadrigeminal region (4,5).
Contraindications to lumbar puncture [7-9] * Major contraindication is raised intracranial pressure * Focal neurological deficit * Papilloedema * Significantly altered level of consciousness * Computed tomography (CT) findings * lateral midline shift * loss of suprachiasmatic or basal cisterns * fourth ventricle effacement * obliteration of supracerebellar or quadrigeminal plate cisterns with patent ambient cisterns * Presence of local infection at lumbar puncture site * Coagulopathy * Thrombocytopenia (platelet count <50 000)
Characteristic imaging appearances of asymmetric narrowing of the internal carotid arteries (especially the supraclinoid portion) with numerous collateral vessels around the brainstem, especially within the ambient and quadrigeminal plate cisterns, are demonstrated with progression.
Because patients are usually scanned in the supine position, particularly important locations include the interpeduncular cistern, the occipital horns of the lateral ventricles, the quadrigeminal plate cistern, and the dependent portions of the Sylvian fissures (Figure 1).
2 X 2 cm irregular enhancing lesion in the region of the quadrigeminal plate.