ambient cistern

am·bi·ent cis·tern

a cistern located on the lateral aspect of the midbrain and dorsally continuous with the quadrigeminal cistern; the ambient cistern is sometimes defined as including the quadrigeminal cistern.
Synonym(s): cisterna ambiens [TA]
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive?
In addition, there were multiple punctiform hyperintense lesions in the left ambient cistern. Left basal vein of Rosenthal was not exhibited in contrast-enhanced magnetic resonance venography [Figure 1].{Figure 1}
A CT scan of the brain showed a small subdural effusion in the frontal and left parietal lobes and a small subarachnoid haemorrhage in the left ambient cistern. There was no midline shift.
On MRI there is a hypointense mass on T1 and T2 -weighted sequences and it appears hypointense on FS (fat saturated) sequences.14 Most intracranial lipomas occur in the midline in the region of the corpus callosum (45%), the ambient cistern and suprasellar region (23%).1,6 These lesions are frequently associated with hypogenesis or agenesis of corpus callosum.4 Intracerebral vessels and cranial nerves may cross through the mass.1 Similarly our case showed that anterior cerebral arteries were crossing through the mass and giving its branches within the lipoma, visualized by contrast enhanced MRI images.
Almost complete obliteration of the contralateral ambient cistern was noted in addition to significant (17 mm) shift of the midline structures to the right.
The status of the fourth ventricle and ambient cisterns predict outcome in moderate and severe traumatic brain injury.
In the case of lesions more than 25 mL, anisocoria, uncal herniation, and asymmetric ambient cisterns, early surgical evacuation is justified.
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