PMC7278216_01
Local ultrasound shows a well-defined mass with a heterogeneous aspect with contact to the sciatic nerve (white arrows show the limit of the tumor).
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F1
A sagittal T1-weighted MRI shows a well-defined mass, low signal intensity, inside the sciatic nerve, just above the popliteal fossa.
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F2
Magnetic Resonance Imaging (MRI) revealed a well-defined heterogeneous mass (7 x 4, 4 x 3, 3 cm), posterior to the sciatic nerve, just above the popliteal fossa (Figure 2).
A sagittal T2-weighted MRI shows hyperintense signal in the mass with a heterogeneous aspect.
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F3
A T2-weighted MRI showed hyper intense signal in the mass (Figure 3).
(a) Schwannoma in situ. (b) It was located just above the polpiteal fossa, originating from the sciatic nerve proximal to its bifurcation.
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F4
A well-delineated tumor was identified, originating from the sciatic nerve proximal to its bifurcation (Figure 4).
(a) Macroscopic aspect of the tumor. The size was +-6 x 4 cm. (b) Note the heterogeneous aspect inside the tumor.
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F5
The tumor was completely excised with preservation of the functioning fascicles (Figure 5).
This figure clearly shows the palisading elements of the Antoni A cells (1), low cellular regions, called Antoni B areas (2) and a blood vessel with a hyalinized wall (3).
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F6