 Redemonstration of postoperative changes from a suboccipital craniotomy with resection of the posterior C1 arch. A postoperative extradural fluid collection is again seen within the overlying soft tissues now measuring 2.9 x 0.7 x 0.9 cm (previously 4.5 x 7.0 cm x 2.8 cm, which has significantly decreased in size. As before there is no significant mass effect upon the adjacent neo-dura. There is irregular, peripheral enhancement about this fluid collection, as well as within the soft tissues along the operative path, however there is no intradural enhancement. The cerebellar tonsils retain a pointed configuration and a previously demonstrated thin process extending through the posterior CSF space appears less anteriorly bowed, thus resulting in an increase of the CSF space posterior to the cerebellar tonsils. Commensurate with this is an increase in the amount of biphasic CSF flow at the level of the cerebellar tonsils.There are no fractures or subluxations. The marrow signal is benign, including a stable benign hemangioma within the C6 vertebral body. C2/3: Unremarkable and unchanged.C3/4: Unremarkable and unchanged.C4/5: Mild posterior osteophyte disc complex causing minimal anterior cord flattening. There is no resulting stenosis. These findings are unchanged.C5/6: Mild posterior osteophyte disc complex causing minimal anterior cord flattening. There is no resulting stenosis. These findings are unchanged.C6/7: Unremarkable and unchanged.C7/T1: Unremarkable and unchanged.
1.A postoperative extradural fluid collection is again seen within the overlying soft tissues now measuring 2.9 x 0.7 x 0.9 cm (previously 4.5 x 7.0 cm x 2.8 cm, which has significantly decreased in size. As before there is no significant mass effect upon the adjacent neo-dura. There is irregular, peripheral enhancement about this fluid collection, as well as within the soft tissues along the operative path, however there is no intradural enhancement. 2.A previously demonstrated thin process extending through the posterior CSF space appears less anteriorly bowed, thus resulting in an increase of the CSF space posterior to the cerebellar tonsils. Commensurate with this is an increase in the amount of biphasic CSF flow at the level of the cerebellar tonsils.