title: Percutaneous radiofrequency ablation of lung tumors close to the heart or aorta: evaluation of safety and effectiveness.
abstract: OBJECTIVE
  The authors retrospectively evaluated the safety and effectiveness of percutaneous radiofrequency ablation of lung tumors close to the heart or aorta.
  
  
  METHODS
  Forty-two tumors (mean diameter, 25 mm +/- 16; range, 5-73 mm) located less than 10 mm from the heart or aorta were treated with radiofrequency ablation in 47 sessions. Lung tumors were classified into two groups according to their distance from the heart or aorta: group A (n = 27) comprised tumors at a distance of 1-9 mm; group B (n = 15) comprised contiguous tumors (distance, 0 mm). The safety and technique effectiveness of the procedure, defined as no evidence of local tumor progression, were evaluated.
  
  
  RESULTS
  Radiofrequency ablation was feasible for all the 42 tumors. Procedural complications included asymptomatic pleural effusion (n = 5), small pneumothorax (n = 11), pneumothorax that necessitated chest tube placement (n = 4), and lung abscess (n = 1). No complications related to the specific tumor location, such as the accidental insertion of the electrode into the heart or aorta, pericardial effusion, arrhythmia, or cardiac infarction, occurred. The overall primary technique effectiveness rate was 75.8%, 45.9%, and 45.9% at 6, 12, and 24 months, respectively. This rate in group A (94.7%, 69.3%, and 69.3% at 6, 12, and 24 months, respectively) was significantly (P < .001) higher than that in group B (42.9% and 8.6% at 6 and 12 months, respectively).
  
  
  CONCLUSIONS
  Radiofrequency ablation of lung tumors close to the heart or aorta was safely performed. The local control of tumors contiguous to the heart or aorta was considerably lower compared with the tumors that were close but not contiguous to these structures.
authors.affiliation: Department of Radiology, Okayama University Medical School, 2-5-1 Shikata-cho, Okayama 700-8558, Japan. iguchi@cc.okayamau.ac.jp
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Iguchi
authors.forename: Takao
authors.initials: T
authors.lastname: Hiraki
authors.forename: Hideo
authors.initials: H
authors.lastname: Gobara
authors.forename: Hidefumi
authors.initials: H
authors.lastname: Mimura
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Fujiwara
authors.forename: Nobuhisa
authors.initials: N
authors.lastname: Tajiri
authors.forename: Jun
authors.initials: J
authors.lastname: Sakurai
authors.forename: Kotaro
authors.initials: K
authors.lastname: Yasui
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Date
authors.forename: Susumu
authors.initials: S
authors.lastname: Kanazawa
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001011:Aorta; D017115:Catheter Ablation / Q000009:adverse effects; D005240:Feasibility Studies; D005260:Female; D005471:Fluoroscopy; D005500:Follow-Up Studies; D006321:Heart; D006801:Humans; D008169:Lung Abscess / Q000209:etiology; D008175:Lung Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D010996:Pleural Effusion / Q000209:etiology; D011030:Pneumothorax / Q000209:etiology; D015641:Radiography, Interventional; D012189:Retrospective Studies; D013997:Time Factors; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome