PMC3690636_01
(a) Color flow showing hypovascularity of the mass. (b) B-mode ultrasound shows the well-encapsulated mass in anterior abdominal wall (arrow).
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fig1
It was hypovascular on color flow (Figures 1(a) and 1(b)).
(a) T1W MRI shows encapsulated superficial mass with marked heterogeneity and patchy hypointense foci (arrow) suggesting cystic degeneration. (b) T2W MRI clearly delineates the capsule of the lesion and internal morphology (arrow). (c) The lesion is markedly hyperintense on fat-suppressed MRI suggesting degeneration (arrow).
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fig2
It was hypointense on T1 and heterogeneously hyperintense on T2 and fat suppressed sequences suggesting cystic degeneration (Figures 2(a), 2(b), and 2(c)).
(a) Peroperative picture shows the superficial location of the mass (arrow). (b) Excised tumor.
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fig3
Macroscopically, the tumor was lobulated and pale yellow in color. (Figures 3(a) and 3(b)).
(a) Microscopic appearance of tumour showing Antoni A pattern with nuclear palisading (H & E staining). (b) Spindle cells in an Antoni type A area; red arrow indicates a large bizarre hyperchromatic nucleus. (c) Immunohistology slide confirming the diagnosis of schwannoma.
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fig4
There was nuclear palisading (Figures 4(a) and 4(b)) although no mitotic figures were seen. Immunohistochemistry showed that the spindle cells were strongly positive for S100 protein (Figure 4(c)) and a final diagnosis of benign "Ancient" schwannoma was made.