"The C1-C2 false localising sign, sometimes referred to merely as the C1-C2 sign, is seen on spinal imaging and can lead to the mislocalisation of a CSF leak in individuals with intracranial hypotension."
"The C1-C2 false localising sign, sometimes referred to merely as the C1-C2 sign, is seen on spinal imaging and can lead to the mislocalisation of a CSF leak in individuals with intracranial hypotension."
"When a CSF leak occurs in the epidural space, due to patient recumbency and the lack of other easy avenues of egress from the spinal canal, fluid tracks and accumulates posteriorly at the C1-C2 level, this is presumably due to limited and loose posterior ligamentous structures at this level, required to allow the rotational mobility of the spine at this level 1."
"The C1-C2 sign can be seen in any modality that can visualise fluid in the epidural and paraspinal soft tissues. Thus, it is encountered in all types of myelography (CT, MRI, fluoroscopic, and nuclear medicine) as well as routine MRI of the spine."
"It appears as pooling of fluid posterior to the C1-C2 posterior elements."