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CT-guided radiofrequency ablation of a bronchogenic carcinoma

Department of Radiology, University Hospital of Freiburg, Hugstetter Strasse 55, D-79106, Freiburg, Germany

View larger version (167K): [in a new window]   Figure 1. CT scan prior to radiofrequency ablation shows a cavitating peripheral squamous cell lung carcinoma of 3.5 cm x 3.5 cm in diameter originating from the basolateral segment of the right upper lobe.

View larger version (150K): [in a new window]   Figure 2. Control CT scan during radiofrequency ablation demonstrates the central position of the unfolded electrode tines of the LeVeen Needle within the tumour.

View larger version (10K): [in a new window]   Figure 3. Course of the tissue impedance during radiofrequency ablation. The impedance of the cavitating tumour ranged between 89 ohms and 97 ohms while power was constantly increased without disturbance. After a procedure-time of 31 min a rise in impedance up to 900 ohms (roll-off) occurred.

View larger version (146K): [in a new window]   Figure 4. Control CT scan immediately after radiofrequency ablation reveals the ablated tumour. Zones of haemorrhage in the surrounding lung parenchyma as well as pleural thickening are detectable indicating that coagulation necrosis has affected the whole tumour volume and thermal injury is exceeding the tumour margins into the adjacent lung. No pneumothorax occurred.