The intramedullary T2 hyperintensity (myelomalacia) marked as **C** represents chronic, irreversible pathological changes in cervical spondylotic myelopathy. This signal abnormality reflects demyelination, neuronal loss, and gliosis resulting from prolonged mechanical compression combined with ischemia from anterior spinal artery compromise. According to Harrison 21e and the Greenberg Handbook, T2 cord signal change is a critical prognostic indicator—it signifies that structural damage has already occurred at the tissue level. While surgical decompression is still indicated for moderate-to-severe CSM to halt further progression, the presence of myelomalacia substantially reduces the likelihood of significant neurological recovery post-operatively. This finding fundamentally alters patient counseling and outcome expectations, as the damage is largely irreversible despite successful decompression. The chronic nature of this patient's 18-month symptom course and the imaging evidence of cord signal change together indicate advanced disease with limited recovery potential.
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