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Pulmonary myxoid leiomyosarcoma

N Koizumi1, T Fukuda, Y Ohnishi

  • 1Second Department of Pathology, Niigata University School of Medicine, Japan.

Pathology International
|November 1, 1995
PubMed
Summary

A rare myxoid leiomyosarcoma was identified in a young man's lung bronchus. This tumor exhibited specific cellular characteristics and potential for spread, requiring further investigation.

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Area of Science:

  • Pulmonology
  • Surgical Pathology
  • Oncology

Background:

  • Primary pulmonary sarcomas are rare, with leiomyosarcoma being an uncommon subtype.
  • Myxoid leiomyosarcoma typically arises in soft tissues, making a bronchial origin exceptional.

Observation:

  • A 20-year-old male presented with a primary myxoid leiomyosarcoma originating from the right middle lobe bronchus.
  • Gross examination revealed a polypoid growth within the bronchial lumen, characterized by spindle cells and abundant myxoid stroma.
  • Microscopic analysis showed intrapulmonary metastasis and bronchial wall invasion.

Findings:

  • Immunohistochemistry demonstrated tumor cell positivity for vimentin, S-100 protein, myosin, and muscle-specific actin.
  • Ultrastructural examination revealed features consistent with smooth muscle differentiation, including thin filaments with dense bodies.

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  • The findings support a diagnosis of myxoid leiomyosarcoma arising from the peribronchial mesenchymal tissue.

    • Implications:

    • This case highlights the possibility of primary myxoid leiomyosarcoma in the bronchus, a rare entity.
    • Understanding the immunohistochemical and ultrastructural profile is crucial for accurate diagnosis and classification.
    • Further research is needed to elucidate the behavior and optimal management of this rare pulmonary tumor.