Posterior lymphadenopathy in sarcoidosis

Area of Science:

• Pulmonary Medicine
• Radiology
• Immunology

Background:

• Sarcoidosis is a multisystem inflammatory disease characterized by non-caseating granulomas.
• Lymphadenopathy is a common manifestation of sarcoidosis, typically involving hilar and paratracheal regions.
• The involvement of posterior mediastinal lymph nodes in sarcoidosis has been less frequently described.

Purpose of the Study:

• To investigate the prevalence and radiographic characteristics of posterior mediastinal lymph node enlargement in biopsy-proven sarcoidosis.
• To determine if posterior mediastinal lymph node enlargement occurs independently or in conjunction with other typical sarcoidosis lymphadenopathy.
• To assess the radiographic behavior of posterior mediastinal lymph nodes in comparison to hilar and paratracheal nodes.

Main Methods:

• Retrospective review of chest radiographs from 30 patients with biopsy-proven sarcoidosis.
• Analysis of lymph node enlargement in hilar, paratracheal, and posterior mediastinal/para-aortic regions.
• Correlation of radiographic findings with clinical diagnosis of sarcoidosis.

Main Results:

• Posterior mediastinal or para-aortic lymph node enlargement was identified in 6 out of 30 patients (20%).
• All patients with posterior mediastinal lymphadenopathy also exhibited symmetrical hilar and/or paratracheal lymph node enlargement.
• The radiographic appearance and behavior of posterior mediastinal lymph nodes were consistent with those of hilar and paratracheal nodes.

Conclusions:

• Posterior mediastinal lymph node enlargement is not an unusual finding in patients with biopsy-proven sarcoidosis.
• When present, posterior mediastinal lymphadenopathy in sarcoidosis typically accompanies typical hilar and/or paratracheal lymphadenopathy.
• Radiographic assessment of sarcoidosis should consider the potential involvement of posterior mediastinal lymph nodes, which share similar imaging characteristics with other affected nodal stations.