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Mediastinal lymph node detection with endosonography

M J Wiersema1, W M Hassig, R H Hawes

  • 1St. Vincent Hospitals and Health Care Center, Indianapolis, Indiana.

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Endosonography reveals a high prevalence of mediastinal lymph nodes in asymptomatic individuals, with size and ultrasound features distinct from malignant nodes. This finding is crucial for accurate cancer staging.

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Area of Science:

  • Gastroenterology
  • Pulmonology
  • Radiology

Background:

  • Mediastinal lymphadenopathy can be a sign of malignancy, but its prevalence in asymptomatic individuals is not well-defined.
  • Endosonography is a valuable tool for visualizing mediastinal structures.

Purpose of the Study:

  • To assess the incidence and sonographic features of mediastinal lymph nodes in patients undergoing endosonography for various conditions.
  • To differentiate benign mediastinal lymph nodes from those indicative of malignancy.

Main Methods:

  • Prospective examination of 82 patients with abdominal pain, masses, or achalasia and 20 asymptomatic volunteers using endosonography.
  • Analysis of lymph node number, size, and ultrasound characteristics (shape, echogenicity).

Main Results:

  • 86% of 99 non-malignant subjects had paraesophageal lymph nodes, with a mean of 3.6 nodes per person.
  • Increasing age and chronic pancreatitis correlated with more lymph nodes; other factors did not.
  • Benign lymph nodes commonly appeared triangular/crescent-shaped and homogeneous/centrally echogenic, distinct from malignant nodes.

Conclusions:

  • A high background prevalence of mediastinal lymph nodes exists, detectable by endosonography.
  • These benign lymph nodes have distinct ultrasound features that aid in differentiation.
  • Consideration of this high prevalence is essential for accurate esophageal and lung carcinoma staging.