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1 Respiratory Medicine Unit, and Depts of 2 Radiology, 3 Pathology, and 4 Thoracic Surgery, Royal Infirmary of Edinburgh, and 5 Gastrointestinal Unit, Western General Hospital, Edinburgh, UK
CORRESPONDENCE: R. C. Rintoul, Dept of Thoracic Oncology, Papworth Hospital, Papworth Everard, Cambridge CB3 8RE, UK. Fax: 44 1480364331. E-mail: robertrintoul@yahoo.co.uk
Keywords: Endobronchial ultrasound, endoscopic ultrasound, fine-needle aspiration, lung cancer, mediastinal lymphadenopathy
Received: August 14, 2004
Accepted November 12, 2004
Accurate staging of the mediastinum in lung cancer is essential for optimising treatment strategies. Conventional transbronchial needle aspiration (TBNA) is a blind procedure, reliant upon prior computed tomography (CT) or ultrasound imaging, but has low sensitivity. The current study reports the initial experience of using a prototype endobronchial ultrasound (EBUS) probe that allows TBNA under real-time imaging.
In 20 patients selected by CT scanning, a linear-array ultrasound bronchoscope was used to visualise paratracheal and hilar lymph nodes, and TBNA was performed under direct ultrasonic control. In seven cases, sequential endoscopic ultrasound (EUS) was used to assess postero-inferior mediastinal lymph nodes. All procedures were performed under conscious sedation.
EBUS-TBNA was undertaken in 18 out of 20 cases and EUS-guided fine-needle aspiration in six out of seven cases. Cytology showed node (N)2/N3 disease in 11 out of 18 EBUS-TBNA cases and provided a primary diagnosis for eight patients. EBUS-TBNA cytology was negative in six cases, which was confirmed by mediastinoscopy or clinical follow-up in four. EUS provided additional information in all cases. There were no procedural complications. Sensitivity, specificity and accuracy for EBUS-TBNA were 85%, 100% and 89%, respectively.
In conclusion, endobronchial ultrasound with real-time transbronchial needle aspiration offers improved sensitivity and accuracy for staging of the middle mediastinum, and, combined with endoscopic ultrasound, should allow investigation of the majority of the mediastinum.
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