title: Fine needle aspiration cytology of hepatic metastasis from a meningeal hemangiopericytoma. A case report.
abstract: BACKGROUND
  Hemangiopericytomas (HPCs) are rare spindle cell tumors, constituting 2.5% of soft tissue neoplasms. Few reports have addressed the fine needle aspiration (FNA) cytology of HPC.
  
  
  METHODS
  We describe the FNA biopsy (FNAB) findings in a 44-year-old patient with a previously resected meningeal hemangiopericytoma. The patient underwent ultrasound-guided FNAB of a 16.0-cm, radiographically heterogeneous density in the liver. The FNA smear showed crowded, ovoid to spindle-shaped cells with poorly defined, scant cytoplasm. The neoplastic cells were positive for CD34 and negative for CD31, factor VIII, glial fibrillary acid protein and cytokeratin AE1/AE3, supporting a diagnosis of HPC and compatible with metastasis from the patient's cerebral tumor.
  
  
  CONCLUSIONS
  This case documents the role of FNA cytology in confirming HPC.
authors.affiliation: Department of Pathology, Johns Hopkins Hospital, 600 North Wolfe Street, Baltimore, Maryland 21287, USA.
authors.forename: Hasan
authors.initials: H
authors.lastname: Ghaffar
authors.forename: Anil
authors.initials: A
authors.lastname: Parwani
authors.forename: Dorothy L
authors.initials: DL
authors.lastname: Rosenthal
mesh_terms: D000328:Adult; D018952:Antigens, CD34 / Q000378:metabolism; D014408:Biomarkers, Tumor; D001707:Biopsy, Needle; D003937:Diagnosis, Differential; D006801:Humans; D007150:Immunohistochemistry; D008099:Liver / Q000378:metabolism / Q000473:pathology*; D008113:Liver Neoplasms / Q000556:secondary*; D008297:Male; D008577:Meningeal Neoplasms / Q000473:pathology*; D008579:Meningioma / Q000556:secondary*
chemical_list: D018952:Antigens, CD34; D014408:Biomarkers, Tumor