Abstract
BACKGROUND: H3K27-altered diffuse midline glioma (DMG) is a newly classified disease according to the 5(th) edition of the World Health Organization classification of the central nervous system tumors. However, little is known about its progression pattern and the timing of surgical intervention, especially regarding spinal cord lesions. CASE DESCRIPTION: A 26-year-old man presented with rapid muscle weakness progression in both upper and lower extremities and urinary dysfunction. Magnetic resonance imaging showed diffuse swelling of the cervicothoracic spinal cord. He underwent decompressive laminectomy with expansive duroplasty and tumor biopsy. The surgical specimen revealed DMG. Immediately after surgery, deterioration of limb paresis was observed, and the patient developed respiratory failure the day after surgery. Head-and-neck computed tomography on the 7(th) day after surgery showed spinal cord swelling and acute obstructive hydrocephalus. CONCLUSION: We report a rare case of a spinal DMG with acute postoperative swelling. Neurological deterioration in patients with spinal cord DMG is often exacerbated, so it is essential to suspect DMG at an early stage based on neuroimaging, and if surgery is performed on the edematous spinal cord, further rapid swelling can occur, as in the present case.