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Extramedullary haematopoiesis: radiological imaging features.

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Extramedullary hematopoiesis (EMH), blood cell production outside bone marrow, presents varied imaging findings. Recognizing these patterns aids diagnosis, especially in abdominal cases where biopsy may be needed.

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Area of Science:

  • Radiology
  • Hematology
  • Pathology

Background:

  • Extramedullary hematopoiesis (EMH) is blood cell production outside the bone marrow, often due to conditions like myelofibrosis or thalassemia.
  • EMH can manifest with diverse imaging features depending on the anatomical location.

Purpose of the Study:

  • To review the common and uncommon imaging appearances of EMH across different anatomical compartments.
  • To aid radiologists in diagnosing EMH and planning appropriate biopsies.

Main Methods:

  • Review of imaging findings of EMH.
  • Correlation with clinical history and underlying causes.

Main Results:

  • Thoracic EMH typically appears as paravertebral fat-containing masses.
  • Abdominal EMH commonly presents as hepatosplenomegaly, potentially with focal masses in the liver, spleen, or peritoneum.
  • Non-fatty abdominal soft-tissue masses require biopsy due to differential diagnoses like lymphoma or sarcoma.

Conclusions:

  • Imaging appearances of EMH vary significantly by location.
  • Clinical history is vital for considering EMH in non-specific abdominal masses.
  • Careful biopsy planning is essential due to hemorrhage risk.