PMC3869915_01
Biopsy of the nasopharyngeal mass, showing sheets of intermediate-sized blasts with round nuclei, dispersed chromatin, distinct nucleoli, and small amounts of cytoplasm. The tumor cells stained positive for myeloperoxidase and weakly for CD117.. Abbreviation: CD, cluster of differentiation; MPO, myeloperoxidase; H&E, hematoxylin and eosin.
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A biopsy of the mass revealed intermediate-sized blastic cells that stained positive for MPO, CD68 (dim), CD99, and CD117 (dim), consistent with involvement by GS (Figure 1).
PET-CT scan showed inflammatory changes in the nasopharynx.. Abbreviations: CT, computed tomography; PET, positron emission tomography.
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A chromosome analyses showed an XX karyotype. An integrated whole body positron emission tomography-computed tomography (PET-CT) scan showed only modest inflammation in the nasopharynx (Figure 2).