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Normal mediastinal lymph node size and number: CT and anatomic study.

G P Genereux, J L Howie

    AJR. American Journal of Roentgenology
    |June 1, 1984
    PubMed
    Summary
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    Normal mediastinal lymph nodes are typically small, with 99% under 16 mm. Size varies by location, with superior nodes smaller than those near the carina, impacting computed tomography (CT) detection.

    Area of Science:

    • Thoracic imaging
    • Mediastinal anatomy
    • Lymph node morphology

    Background:

    • Accurate characterization of normal mediastinal lymph nodes is crucial for interpreting imaging studies.
    • Previous studies have provided limited data on the size and distribution of normal mediastinal lymph nodes.
    • Computed tomography (CT) is a primary modality for evaluating the mediastinum.

    Purpose of the Study:

    • To retrospectively evaluate the size, number, and distribution of normal mediastinal lymph nodes using computed tomography (CT) and autopsy data.
    • To establish reference ranges for normal lymph node dimensions in different mediastinal compartments.
    • To assess the detectability of normal lymph nodes by CT based on their location.

    Main Methods:

    • Retrospective analysis of CT scans from 39 patients with normal mediastinal lymph nodes.

    Related Experiment Videos

  • Autopsy dissection of mediastinal lymph nodes in 12 cadavers.
  • Division of the mediastinum into four zones based on anatomical landmarks.
  • Measurement of lymph node dimensions and assessment of CT detectability.

    • Main Results:

    • 99% of mediastinal lymph nodes measured less than 16 mm in largest diameter on CT.
    • Average lymph node size in cadavers was 12.6 x 8.3 mm.
    • CT detected lymph nodes in 65%-95% of patients, varying by mediastinal zone.
    • Significant size differences were observed between superior and middle mediastinal lymph nodes (p < 0.001).
    • 7% of lymph nodes in zone 1 were >5 mm, while 90% in zone 3 and 67% in zone 4 were 6-10 mm.

    Conclusions:

    • Normal mediastinal lymph nodes are generally small, with size varying significantly by anatomical location.
    • CT detectability of normal lymph nodes is influenced by their size and location within the mediastinum.
    • These findings provide valuable reference data for radiologists interpreting thoracic CT scans.