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FIG 2. Histologic evaluation of low-grade biphasic synovial sarcoma involving the right paravertebral area with neural foraminal and spinal epidural extension.
A, The spindle cells of the tumor are uniform and relatively small, with ovoid pale-staining nuclei and inconspicuous nucleoli (hematoxylin and eosin, original magnification x400).
B, The epithelial cells of the tumor have ovoid nuclei and abundant cytoplasm. They form glands with lumen (asterisks) (hematoxylin and eosin, original magnification x400).
C, Immunohistochemistry for cytokeratin demonstrates the epithelial components of the tumor (arrows) (cytokeratin [AE1/AE3], ABC method, original magnification x200).
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