Size of normal retroperitoneal lymph nodes

Area of Science:

• Radiology
• Medical Imaging
• Oncology

Background:

• Computed Tomography (CT) is crucial for diagnosing retroperitoneal lymph node diseases.
• Accurate assessment relies on evaluating lymph node size in the transverse plane.
• Existing data on normal lymph node size is inconsistent, complicating diagnosis.

Purpose of the Study:

• To establish normal size parameters for retroperitoneal lymph nodes.
• To define reference values for lymph node diameters in the para-aortic chains.
• To improve the accuracy of CT-based retroperitoneal lymph node disease diagnosis.

Main Methods:

• Measurement of lymph node diameters on lymphograms from 95 patients.
• Selection of lymphograms considered normal.
• Analysis of node size variation based on anatomical position.

Main Results:

• Normal lymph node diameters were determined.
• The upper limit for node diameter ranges from 7 to 15 mm.
• A consistent trend of increasing diameter in the caudal direction was observed in para-aortic chains.

Conclusions:

• Retroperitoneal lymph node size varies significantly with anatomical location.
• Establishing location-specific normal diameter ranges enhances CT diagnostic accuracy.
• Findings provide essential reference data for interpreting retroperitoneal lymph node size on CT.