12 November 2025
: Case report 
Lumbar Extradural Extraskeletal Ewing Sarcoma with Psoas Denervation: A Case Report
Mistake in diagnosis, Rare disease
Xiao Tian EF 1, Chuanping Gao
AB 1*
DOI: 10.12659/AJCR.949885
Am J Case Rep 2025; 26:e949885
Figure 4 (A) Light microscopy revealed clusters of atypical small blue round cells with hyperchromatic nuclei, scant cytoplasm, and mitotic figures (hematoxylin and eosin staining, ×100). (B) NKX2.2 positivity. (C) Membranous expression of CD99.