title: Fine-needle aspiration cytology of hemangiopericytoma: report of two cases.
abstract: The fine-needle aspiration biopsy (FNAB) findings in two cases of hemangiopericytoma (HP), arising in the parotid gland and on the inner chest wall, respectively, are reported. Smear preparations in each case showed cytologic features of an undifferentiated spindle-cell neoplasm, whereas a core needle biopsy specimen of the chest wall mass showed a spindle-cell tumor with a "staghorn-like" arrangement of endothelium-lined vascular channels. Immunostains performed on this core biopsy, and on the surgical resection specimens in both cases, showed positive staining of tumor cells for vimentin and CD34, with negative staining for a variety of smooth muscle, epithelial, neural, and neuroendocrine markers. Electron microscopy performed in one case further supported the diagnosis of HP. With adequate sampling and appropriate use of ancillary studies, a diagnosis of HP can be reliably suggested on the basis of FNAB and core biopsy of a soft-tissue mass.
authors.affiliation: Division of Cytopathology, Department of Pathology, University of Texas Medical Branch, Galveston 77555-0548, USA.
authors.forename: R N
authors.initials: RN
authors.lastname: Sawh
authors.forename: S M
authors.initials: SM
authors.lastname: Lele
authors.forename: J
authors.initials: J
authors.lastname: Borkowski
authors.forename: K C
authors.initials: KC
authors.lastname: Ventura
authors.forename: P
authors.initials: P
authors.lastname: Zaharopoulos
authors.forename: R
authors.initials: R
authors.lastname: Logroño
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000032:analysis; D001707:Biopsy, Needle; D005260:Female; D006393:Hemangiopericytoma / Q000737:chemistry / Q000175:diagnosis* / Q000532:radiotherapy / Q000601:surgery; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D009363:Neoplasm Proteins / Q000032:analysis; D010307:Parotid Neoplasms / Q000737:chemistry / Q000175:diagnosis* / Q000532:radiotherapy / Q000601:surgery; D018714:Radiotherapy, Adjuvant; D013899:Thoracic Neoplasms / Q000737:chemistry / Q000175:diagnosis* / Q000601:surgery; D014057:Tomography, X-Ray Computed
chemical_list: D014408:Biomarkers, Tumor; D009363:Neoplasm Proteins