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[Granulocytic sarcoma developing in lymph nodes].

Ichiro Watanabe1, Yoshihiro Yakushijin, Ikuya Sakai

  • 1First Department of Internal Medicine, Ehime University School of Medicine.

[Rinsho Ketsueki] the Japanese Journal of Clinical Hematology
|July 5, 2002
PubMed
Summary
This summary is machine-generated.

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A rare case of granulocytic sarcoma initially misdiagnosed as non-Hodgkin lymphoma highlights the importance of comprehensive diagnostic markers. This myeloid malignancy requires specific treatment for optimal patient outcomes.

Area of Science:

  • Hematology
  • Oncology
  • Pathology

Background:

  • A 77-year-old male presented with a cervical tumor initially diagnosed as non-Hodgkin lymphoma.
  • The patient received chemotherapy (THP-COP) for stage IV disease.

Observation:

  • Flow cytometry revealed co-expression of lymphoid (CD5, 7, 21) and myeloid (CD11b, 33, 34) markers.
  • Immunohistochemistry showed positivity for MT1 (CD43) but negativity for myeloperoxidase and chloroacetate esterase.
  • Genetic analysis detected no IgH, TCR C beta 1, or TCR J gamma gene rearrangement.

Findings:

  • The diagnostic re-evaluation shifted the diagnosis from malignant lymphoma to granulocytic sarcoma.
  • THP-COP therapy achieved complete remission of the granulocytic sarcoma.
  • The patient later developed acute myelocytic leukemia (AML M1) and succumbed to pneumonia despite further treatment.

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Implications:

  • Accurate diagnosis of granulocytic sarcoma is crucial, requiring integrated analysis of flow cytometry, immunohistochemistry, and genetic studies.
  • Co-expression of lymphoid and myeloid markers can complicate lymphoma diagnoses.
  • Granulocytic sarcoma may precede or transform into acute myeloid leukemia, necessitating vigilant monitoring.