title: Fine-needle aspiration biopsy of metastatic Ewing's sarcoma with MIC2 (CD99) immunocytochemistry.
abstract: The use of fine-needle aspiration biopsy (FNAB) has been infrequently described as a diagnostic modality for Ewing's sarcoma (ES) patient follow-up and management. The purpose of this study is to examine the use and accuracy of FNAB combined with MIC2 immunocytochemistry for evaluating metastases in patients with ES. Records from Saint Louis University Health Sciences Center and Indiana University Medical Centers identified patients with known ES who had undergone FNAB for evaluation of potential metastases. Immunocytochemical analysis for MIC2 (CD99) was performed retrospectively on cell blocks and direct aspirate smears. FNABs from nine patients were procured either percutaneously or under radiologic guidance and in all cases a definitive cytologic diagnosis of metastatic ES was rendered. Aspirates were cellular with many single discohesive small round cells and occasional loosely cohesive clusters. The nuclei were round with a fine chromatin pattern and small nucleoli. The cytoplasm was scanty and the nuclear-cytoplasmic ratio was high. Six of six cases showed strongly positive immunocytochemical labeling for MIC2. Immunocytochemistry with MIC2 in FNAB aspirate smears can provide supportive evidence of ES in patients with known disease.
authors.affiliation: Department of Pathology, Saint Louis University School of Medicine, Missouri, USA.
authors.forename: B T
authors.initials: BT
authors.lastname: Collins
authors.forename: H M
authors.initials: HM
authors.lastname: Cramer
authors.forename: B E
authors.initials: BE
authors.lastname: Frain
authors.forename: M M
authors.initials: MM
authors.lastname: Davis
mesh_terms: D000071443:12E7 Antigen; D000328:Adult; D015703:Antigens, CD / Q000032:analysis*; D001707:Biopsy, Needle; D001859:Bone Neoplasms / Q000737:chemistry / Q000473:pathology*; D015815:Cell Adhesion Molecules / Q000032:analysis*; D002467:Cell Nucleus; D002648:Child; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D008175:Lung Neoplasms / Q000737:chemistry / Q000473:pathology / Q000556:secondary*; D008297:Male; D008479:Mediastinal Neoplasms / Q000737:chemistry / Q000473:pathology / Q000556:secondary*; D008875:Middle Aged; D012189:Retrospective Studies; D012512:Sarcoma, Ewing / Q000737:chemistry / Q000473:pathology / Q000556:secondary*; D012983:Soft Tissue Neoplasms / Q000737:chemistry / Q000473:pathology*
chemical_list: D000071443:12E7 Antigen; D015703:Antigens, CD; C061828:CD99 protein, human; D015815:Cell Adhesion Molecules