CLE vs. ROSE for Ex Vivo Lung Biopsy Assessment

Following navigational bronchoscopy and target confirmation via radial endobronchial ultrasound (r-EBUS) and in vivo CLE, a lung biopsy is performed. The first retrieved specimen is immediately transferred to the CLE workstation. A CLE expert measures the specimen dimensions and then performs a comprehensive surface scan of the intacttissue using a confocal miniprobe. The operator records the time required for setup and imaging. Based exclusively on the real-time microarchitectural patterns (e.g., loss of normal alveolar honeycombing, dense cell clusters), the blinded CLE expert renders a preliminary diagnosis of "benign" or "malignant." Crucially, this intervention is non-consumptive, meaning the tissue remains physically intact and structurally preserved after the scan for the subsequent ROSE procedure.

Immediately following the completion of the ex vivo CLE imaging on the same biopsy specimen, the tissue undergoes ROSE processing. A ROSE expert (cytopathologist) performs a smear preparation using the CLE-scanned tissue. The specimen is then stained (e.g., Diff-Quik) and evaluated microscopically. The operator records the time required for smear preparation, staining, and interpretation. The blinded ROSE expert assesses the presence of atypical cells or diagnostic material to render a cytological diagnosis of "benign" or "malignant." Unlike the preceding CLE step, this intervention is consumptive, as it requires the physical disruption of the tissue architecture to transfer cellular material onto glass slides.