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Assessment of cervical lymph node metastases using indirect computed tomography lymphography with iopamidol in a tongue VX2 carcinoma model

Published online by Cambridge University Press:  31 May 2011

Y Shu ,
X Xu ,
Z Wang ,
W Dai ,
Y Zhang ,
Y Yu ,
Y Sha  and
H Wu
Y Shu
Affiliation:
Department of Otolaryngology-Head and Neck Surgery, Eye and ENT Hospital, Fudan University, Shanghai, China
X Xu
Affiliation:
Department of Otolaryngology, Shanghai Seventh People's Hospital, Fudan University, Shanghai, China
Z Wang
Affiliation:
Department of Otolaryngology-Head and Neck Surgery, Eye and ENT Hospital, Fudan University, Shanghai, China
W Dai
Affiliation:
Department of Otolaryngology-Head and Neck Surgery, Eye and ENT Hospital, Fudan University, Shanghai, China
Y Zhang
Affiliation:
Department of Otolaryngology-Head and Neck Surgery, Eye and ENT Hospital, Fudan University, Shanghai, China
Y Yu
Affiliation:
Department of Biostatistics, School of Public Health, Fudan University, Shanghai, China
Y Sha
Affiliation:
Department of Radiology, Eye and ENT Hospital, Fudan University, Shanghai, China
H Wu*
Affiliation:
Department of Otolaryngology-Head and Neck Surgery, Eye and ENT Hospital, Fudan University, Shanghai, China
*
Address for correspondence: Dr Haitao Wu, 83 FenYang Road, Shanghai 200031, PR China Fax: +086 21 64377151 E-mail: Haitaowu1103@hotmail.com
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Abstract

Objective:

To investigate the performance of indirect computed tomography lymphography with iopamidol for detecting cervical lymph node metastases in a tongue VX2 carcinoma model.

Materials and methods:

A metastatic cervical lymph node model was created by implanting VX2 carcinoma suspension into the tongue submucosa of 21 rabbits. Computed tomography images were obtained 1, 3, 5, 10, 15 and 20 minutes after iopamidol injection, on days 11, 14, 21 (six rabbits each) and 28 (three rabbits) after carcinoma transplantation. Computed tomography lymphography was performed, and lymph node filling defects and enhancement characteristics evaluated.

Results:

Indirect computed tomography lymphography revealed bilateral enhancement of cervical lymph nodes in all animals, except for one animal imaged on day 28. There was significantly slower evacuation of contrast in metastatic than non-metastatic nodes. A total of 41 enhanced lymph nodes displayed an oval or round shape, or local filling defects. One lymph node with an oval shape was metastatic (one of 11, 9.1 per cent), while 21 nodes with filling defects were metastatic (21/30, 70 per cent). The sensitivity, specificity, accuracy, and positive and negative predictive values when using a filling defect diameter of 1.5 mm as a diagnostic criterion were 86.4, 78.9, 82.9, 82.6 and 83.3 per cent, respectively.

Conclusion:

When using indirect computed tomography lymphography to detect metastatic lymph nodes, filling defects and slow evacuation of contrast agent are important diagnostic features.

Keywords

LymphographyComputed TomographyLymph NodeNeoplasm MetastasisHead And Neck Neoplasms

Information

Type
Main Articles
Information
The Journal of Laryngology & Otology , Volume 125 , Issue 8 , August 2011 , pp. 820 - 828
Copyright
Copyright © JLO (1984) Limited 2011

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