PMC8571428_01
Preoperative scans reveal a lesion located at the ventral craniocervical junction. The lesion is shown hyperintense on PD-weighted imaging (a, sagittal), heterogeneous on T1-weighted (b, sagittal; c, axial), isodense on CT (d, axial), and hyperintense on T2-weighted MRI (e, sagittal; f, axial).
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F1
A CT scan revealed a 20 x 15 x 23 mm isodense focal lesion in the posterior fossa at the level of the foramen magnum [Figure 1a]. T2 [Figure 1e and f] weighted MRI scans revealed a 22 x 11 x 33 mm well-defined cystic mass with two heterogeneous compartments within the foramen magnum at the level of C1-2. The medulla and spinal cord were shown to be displaced and compressed along with remodeling of the vertebral arteries with the right artery mainly affected. The superior half of the lesion was hyperintense on T2WI [Figure 1e] and moderately hypointense on T1WI MRI [Figure 1c]. The inferior half of the lesion was hypointense on T2WI and hyperintense on T1WI MRI.