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Loss of cellular viability in areas of ground-glass opacity on computed tomography images immediately after pulmonary radiofrequency ablation in rabbits

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Abstract

Purpose

To determine cellular viability of lung parenchyma and neoplastic cells in areas of ground-glass opacity (GGO) on computed tomography (CT) images immediately after pulmonary radiofrequency ablation (RFA) in rabbits.

Materials and methods

A LeVeen RFA electrode was placed percutaneously into rabbit lungs with or without metastatic VX2 tumors. Five minutes later, seven isolated lungs were imaged by use of a multi-detector row CT scanner, and the images were compared with histological features. The cellular viability of the lung tissues was assessed by nicotinamide adenine dinucleotide hydrogen (NADH) staining in eight normal lungs and in three lungs with multiple metastatic tumors.

Results

All lung lesions appeared as bilayered structures with a central, dense, attenuated area and an outer area of GGO on CT images, and as three-layered structures on macroscopic and microscopic images 5 min after RFA. The GGO areas approximately corresponded to the outer two layers in macroscopic images that were exudative and congestive on microscopic images. Staining for NADH was significantly reduced in the GGO and densely attenuated areas with or without tumor tissue staining compared with the non-ablated area.

Conclusions

Our results suggest that an area of GGO that appears on CT immediately after RFA can be effectively treated by RFA.

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Acknowledgments

We are deeply grateful to Ms Kyoko Ohashi for technical assistance.

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Correspondence to Masaomi Kuroki.

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Kuroki, M., Nakada, H., Yamashita, A. et al. Loss of cellular viability in areas of ground-glass opacity on computed tomography images immediately after pulmonary radiofrequency ablation in rabbits. Jpn J Radiol 30, 323–330 (2012). https://doi.org/10.1007/s11604-012-0054-y

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  • DOI: https://doi.org/10.1007/s11604-012-0054-y

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