PMC9479506_01
Preoperative MRI images: (a) Coronal T1-weighted image showing a posterior fossa lesion with a homogeneous center and peripheral high-signal intensity rim, seen to be extending down through to the cervicomedullary junction. Upward displacement of the brainstem can be seen as well as the basilar artery, with compression of the cerebellum. (b) Coronal T2-weighted image. Postoperative MRI images: (c) Coronal T1-weighted image with posterior resection cavity. (d) Coronal T2-weighted image. (e and f) Coronal T1-weighted and T2-weighted images showing extension of the lesion to the thoracic spinal cord. (g and h) Axial T2-weighted images depicting the lesion at the skull base and craniocervical junction, pre- and postoperatively.
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F1
Preoperative MRI scans showed a solid-cum-cystic lesion with enhancement along the midline in the posterior fossa extending distally into the cervical spinal cord reaching to the level of upper endplate of the D1 vertebral body, measuring approximately 13.3 x 4.6 x 3.4 cm [Figure 1].
Intraoperative images showing the fibrous, adherent tumor bed (a) and highly pigmented tumor (b).
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F2
A hyper-pigmented and black colored tumor with no clear margins was visualized [Figure 2].