PMC3420768_01
High power H and E image of a monotonous small round blue cell infiltrate.
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fig1
A guided FNA reported suspicious cytology showing sheets of undifferentiated cells amongst an infiltrate of uniform small blue cells with a high nuclear-cytoplasmic ratio (Figure 1).
Crisp membrane staining with CD99.
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fig2
The morphological features, however, with supporting immunohistochemical expression of the CD99/MIC2 antigen led to a diagnosis of Ewing's sarcoma (Figure 2). 
CT axial section showing tumour invading right zygomatic arch.
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fig3
A single-photon emission computed tomography (SPECT) scan demonstrated an increased tracer uptake in the right zygomatic arch with the bone being atrophic and irregular, eroded by a 2.9 x 1.6 cm nodule adjacent to the temporalis muscle (Figure 3).