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Cytopathologic diagnoses of fine‐needle aspirations from endoscopic ultrasound of the mediastinum

Endoscopic ultrasound‐guided fine‐needle aspiration biopsy through the esophagus (EUS‐FNA) or the bronchial tree (endobronchial ultrasound guided transbronchial needle aspiration [EBUS‐TBNA]) may be used to obtain specimens from mediastinal structures. The accuracy of this procedure has been well documented. However, no studies have studied the reproducibility of the pathologic assessment of the aspirated material.