 There is transitional anatomy with either 11 thoracic and 5 lumbar vertebrae or 12 thoracic and 4 lumbar vertebrae. For the purposes of this exam, the last fully formed disc space will be termed L4-S1. There are postoperative findings related to suboccipital craniotomy for Chiari decompression. There is expected biphasic CSF flow anteriorly and posteriorly across the neo-foramen magnum. There is minimal retroflexion of the dens. The cerebellar tonsils lie at the level of C1. At the C1-C2 level, there is focal syringohydromyelia which measures 6 x 5 x 12 mm, previously 7 x 7 x 12 mm. There is an approximately 58 x 41 mm fluid collection within the left abdomen and pelvis, as well as smaller amount of fluid within the right abdomen that is likely related to the patient's lumboperitoneal shunt. The vertebral column alignment is unchanged, with straightening of the cervicothoracic alignment. The vertebral body and disc space heights are preserved. The vertebral bone marrow signal is unremarkable. There is no significant spinal canal stenosis. The conus terminates at T12-L1, using the chosen nomenclature for this exam.
1.Transitional vertebral anatomy, as detailed above. Close attention and correlation during any future spine surgery is recommended. 2.Postoperative findings related to Chiari decompression surgery with patent neo-foramen magnum. 3.A focal syringohydromyelia at the C1-C2 level has minimally decreased in size. 4.Persistent intraperitoneal fluid collections may represent a pseudocyst related to the lumboperitoneal shunt. An ultrasound of this region may be useful for further evaluation.