PMC5736932_01
MRI of the pelvic mass with (a) T1, (b) T1 + contrast, and (c) T2 images.
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fig1
Range: 0.0-35.0 U/mL). Repeat MRI from this most recent encounter showed an interval increase in the size, which now measured 4.3 x 3.8 x 4.1 cm (Figure 1).
Ultrasound of the left adnexal mass in transview.
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Repeat ultrasound prior to surgery revealed a 5.5 x 4.6 x 4.0 cm mixed cystic and solid left adnexal mass (Figure 2).
Histologic section showing a bland-appearing, spindled cell proliferation with regions of higher cellularity (Antoni A) interlaced with those of lesser cellularity (Antoni B) (H&E stain, 200x original magnification).
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There are regions of higher, more compact cellularity interlaced with areas that are more loosely cellular, corresponding to the Antoni A and Antoni B patterns (Figure 3).
Histologic section showing prominent, hyalinized blood vessels with admixed hemosiderin ("ancient changes") (H&E stain, 100x original magnification).
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There are thickened, hyalinized blood vessels and patchy foci of hemosiderin deposition (Figure 4).
Diffuse immunoreactivity for S-100 protein in neoplastic cells confirms Schwann cell origin of the tumor (200x original magnification).
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Neoplastic cells show diffuse reactivity (nuclear and cytoplasmic) for the S-100 protein (Figure 5).