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Myofibrosarcoma.

Cyril Fisher1

  • 1Royal Marsden Hospital, Fulham Road, SW3 6JJ London, UK. cyril.fisher@rmh.nthames.nhs.uk

Virchows Archiv : an International Journal of Pathology
|June 3, 2004
PubMed
Summary
This summary is machine-generated.

Myofibrosarcomas are malignant tumors of myofibroblasts, recently defined as low- or high-grade sarcomas. This article details their variants and related malignant tumors with myofibroblastic differentiation.

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Area of Science:

  • Oncology
  • Pathology
  • Surgical Pathology

Background:

  • Myofibroblastic tumors have been recognized for years but only recently clearly defined.
  • Myofibrosarcomas are malignant tumors originating from myofibroblasts.
  • These sarcomas can arise in soft tissue or bone in both adults and children.

Purpose of the Study:

  • To describe low- and high-grade variants of myofibrosarcoma.
  • To discuss other malignant tumors exhibiting myofibroblastic differentiation.
  • To enhance understanding of these rare malignant neoplasms.

Main Methods:

  • Histopathological analysis of tumor samples.
  • Immunohistochemical staining for smooth-muscle actin, calponin, desmin, and h-caldesmon.
  • Ultrastructural examination for myofibroblastic differentiation.

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Main Results:

  • Low-grade myofibrosarcomas are infiltrative, often in deep soft tissue (head/neck predilection), with variable histology and focal nuclear pleomorphism.
  • Low-grade tumors express smooth-muscle actin and calponin; some express desmin, but most lack h-caldesmon.
  • High-grade pleomorphic myofibrosarcomas resemble malignant fibrous histiocytoma but are more frequently actin-positive.

Conclusions:

  • Myofibrosarcomas encompass low- and high-grade malignant tumors with myofibroblastic differentiation.
  • Distinguishing low-grade myofibrosarcomas from benign proliferations and other sarcomas is crucial.
  • Pleomorphic myofibrosarcomas represent a high-grade entity with myofibroblastic lineage.