Diagnostic and Interventional Radiology
Chest Imaging - Original Article

CT differentiation of enlarged mediastinal lymph node due to anthracosis from metastatic lymphadenopathy: a comparative study proven by endobronchial US-guided transbronchial needle aspiration

1.

Department of Diagnostic and Interventional Radiology, Allgemeines Krankenhaus Hagen, Germany

2.

Department of Medicine, Klinikum Wedau Duisburg, Germany

3.

Department of Cytopathology, Heinrich Heine Universität Düsseldorf, Germany.

4.

Department of Diagnostic and Interventional Radiology and Nuclearmedicine, Katholisches Marienhospital Herne Universitätsklinikum der Ruhr-Universität Bochum, Germany

5.

Department of Radiology, Universitätsklinikum Würzburg, Germany

Diagn Interv Radiol 2015; 21: 128-133
DOI: 10.5152/dir.2014.14112
Read: 839 Downloads: 261 Published: 03 September 2019

Abstract

PURPOSE

Anthracosis often results in mediastinal nodal enlargement. The aim of this comparative study was to evaluate if it is possible to differentiate endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) proven anthracotic lymph nodes from malignant lymph node enlargement by means of multislice computed tomography (MSCT).

 

METHODS

We compared the MSCT findings of 89 enlarged lymph nodes due to anthracosis with 54 malignant lymph nodes (non-small cell lung cancer 75.9%, small cell lung cancer 18.5%, and non-Hodgkin lymphoma 5.6%). The lymph nodes were assessed for density (calcification, fat, and necrosis), shape (oval, round), contrast enhancement, and contour (sharp, ill-defined).

 

RESULTS

Malignant lymph nodes showed significantly greater axis diameters (P < 0.001). Both anthracotic and malignant nodes were most often oval (86.5% of all malignant nodes vs. 81.5% of all anthracotic nodes, P = 0.420) and showed confluence in a remarkable percentage (28.1% vs. 42.6%, P = 0.075). Anthracotic nodes showed calcifications more often (18% vs. 0%, P < 0.001). Malignant lymph nodes showed a significantly greater short and long axis diameter (P < 0.001), and they had a higher frequency of ill-defined contours (27.8% vs. 2.2%, P < 0.001) and contrast enhancement (27.8% vs. 5.6%,  P < 0.001). Nodal necrosis, which appeared in one third of the malignant nodes, was not observed in anthracosis (35.2% vs. 0%, P < 0.001). Confluence of enlarged lymph nodes was seen in malignant lymph nodes (42.6%), as well as in lymph node enlargement due to anthracosis (28.1%, P = 0.075).

 

CONCLUSION

 

Our results show that there are significant differences in MSCT findings of malignant enlarged lymph nodes and benign lymph node enlargement due to anthracosis. 

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EISSN 1305-3612