Immunohistochemical Analysis of CD99 and PAX8 in a Series of 15 Molecularly Confirmed Cases of Ewing Sarcoma

Figure 1

(a) Uniform small round tumour cells with round nuclei and scanty cytoplasm (H&E). (b) Moderate nuclear immunoreactivity for PAX8 (IHQ). (c) Strong and diffuse membranous immunoreactivity for CD99 (IHQ). (d) Split signals due to the rearrangement of EWSR1 (FISH).

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