Pathology
H&E
H&E
H&E
H&E
H&E
H&E
CD99
H&E: Small cell sarcoma, findings consistent with primitive neuroectodermal tumor and/or Ewing's sarcoma with extensive necrosis of the soft tissues of the presacral region.
Immunohistochemical: morphological and immunohistochemical findings consistent with primitive neuroectodermal tumor and/or Ewing's sarcoma of the soft parts of the sacral region.