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Related Experiment Videos

Hemangiopericytoma: histopathological pattern or clinicopathologic entity?

O Nappi1, J H Ritter, G Pettinato

  • 1Department of Pathology, Benevento General Hospital, Italy.

Seminars in Diagnostic Pathology
|August 1, 1995
PubMed
Summary

Hemangiopericytoma (HPC) diagnosis remains challenging due to overlapping histological features with other tumors. Advanced pathological analyses are crucial for distinguishing true HPC from mimics, clarifying its status as a distinct entity.

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Area of Science:

  • Pathology
  • Oncology
  • Histology

Background:

  • The tumor designated "hemangiopericytoma" (HPC) by Stout and Murray over 50 years ago continues to cause diagnostic uncertainty among pathologists.
  • Questions persist regarding whether the hemangiopericytomatous growth pattern represents a reproducible biological entity or a shared morphological feature among diverse neoplasms.

Purpose of the Study:

  • To investigate the diagnostic challenges associated with hemangiopericytoma (HPC).
  • To clarify the distinction between true HPC and other neoplasms exhibiting similar histological features.
  • To emphasize the role of specialized pathological analyses in accurate diagnosis.

Main Methods:

  • Review of histological features of various neoplasms.
  • Immunohistochemical analysis (vimentin, CD34, CD57) to define HPC phenotype.

Related Experiment Videos

  • Ultrastructural evaluation to assess cytoplasmic filaments.
  • Comparison of clinical and subcellular characteristics of HPC and similar lesions.

    • Main Results:

    • Hemangiopericytomatous morphology is observed in a wide range of tumors, including synovial sarcomas, malignant fibrous histiocytomas, and solitary fibrous tumors.
    • True HPC is characterized by vimentin reactivity (with or without CD34, CD57) and lacks markers of epithelial, neural, or myogenous differentiation.
    • Ultrastructural studies reveal myogenous-type cytoplasmic filaments in HPC, despite the lack of corresponding immunodeterminants.
    • Lesions like solitary fibrous tumors and sinonasal hemangiopericytoma-like tumors share features with HPC but have distinct characteristics.

    Conclusions:

    • The hemangiopericytoma is both a distinct pathological entity and a morphological pattern.
    • Accurate diagnosis requires differentiating HPC from other neoplasms with similar histology.
    • Adjuvant pathological studies, including immunohistochemistry and ultrastructural analysis, are essential for definitive diagnosis.