The Vanishment of an Intramedullary High-Signal Intensity Lesion at the Craniocervical Junction After Surgical Treatment

A case report of the presyrinx state at the craniocervical junction with vanishment of an intramedullary high-signal lesion followed by decompression and fixation.To report the reversible change of an intramedullary high-signal lesion on T2-weighted MRI as a presyrinx state.The pathology of a T2-weighted high-signal intensity area in the spinal cord has not yet been described in detail. The case presented here showed the vanishment of this lesion after the surgical procedure, which implies that some high-signal intensity lesions might be reversible as a presyrinx state.A 75-year-old man presented with severe cervical myelopathy. Neurologic findings and observations on various images indicated compression myelopathy due to both a pseudotumor at the craniocervical junction and spondylosis at C3-C4 disc level due to Klippel-Feil syndrome. The most obvious finding was a vast high-signal intensity lesion at the craniocervical junction, which was speculated to be a syringomyelia before surgery.The MRI at 1 month after surgical treatment (occipito-spinal fusion with the decompression by enlargement of foramen magnum) revealed complete vanishment of the vast high intensity lesion at the craniocervical junction, which remained undetected at the 2 years and 8 months follow-up and corresponded with improvement in the clinical symptoms of myelopathy.The vanishment of these signal changes on MRI after surgery was interpreted as a presyrinx state, demonstrating this reversible pathology in the spinal cord.