PMC9170391_01
CT scan images revealing multiple gas bubbles at L5/S1 level as shown in axial (a) and sagittal (b) cuts.
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fig1
Axial CT revealed multiple intracannular posterolateral gas bubbles at L5-S1 level (Figure 1).
T2 sequences in sagittal (a) and axial orientation (b) illustrate a caudally shifted hypointense mass in the right lateral recessus L5/S1 with contact to the nerve root S1 suspicious of a sequestered disc herniation.
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fig2
According to MRI results, a well-encapsulated low signal intensity lesion was related to gas formation or calcification (Figure 2).
CT reveals a single large epidural gas bubble mimicking disc herniation on MRI as shown in axial (a) and sagittal (b) cuts. A coexisting vacuum disc phenomenon indicates the presumed origin of the gas bubble.
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fig3
An additional CT was performed, revealing a large intraspinal epidural bubble compressing the right S1 nerve root (Figure 3).