The Maximum standardized uptake value is more reliable than size measurement in early follow-up to evaluate potential pulmonary malignancies following radiofrequency ablation

Acta Med Okayama. 2013;67(2):105-12. doi: 10.18926/AMO/49669.


We retrospectively evaluated the accumulation of fluorodeoxy glucose (FDG) in pulmonary malignancies without local recurrence during 2-year follow-up on positron emission tomography (PET)/computed tomography (CT) after radiofrequency ablation (RFA). Thirty tumors in 25 patients were studied (10 non-small cell lung cancers;20 pulmonary metastatic tumors). PET/CT was performed before RFA, 3 months after RFA, and 6 months after RFA. We assessed the FDG accumulation with the maximum standardized uptake value (SUVmax) compared with the diameters of the lesions. The SUVmax had a decreasing tendency in the first 6 months and, at 6 months post-ablation, FDG accumulation was less affected by inflammatory changes than at 3 months post-RFA. The diameter of the ablated lesion exceeded that of the initial tumor at 3 months post-RFA and shrank to pre-ablation dimensions by 6 months post-RFA. SUVmax was more reliable than the size measurements by CT in the first 6 months after RFA, and PET/CT at 6 months post-RFA may be more appropriate for the assessment of FDG accumulation than that at 3 months post-RFA.

Publication types

  • Validation Study

MeSH terms

  • Adenocarcinoma / diagnostic imaging
  • Adenocarcinoma / secondary
  • Adenocarcinoma / surgery
  • Aged
  • Aged, 80 and over
  • Carcinoma, Non-Small-Cell Lung / diagnostic imaging*
  • Carcinoma, Non-Small-Cell Lung / secondary
  • Carcinoma, Non-Small-Cell Lung / surgery*
  • Carcinoma, Squamous Cell / diagnostic imaging
  • Carcinoma, Squamous Cell / secondary
  • Carcinoma, Squamous Cell / surgery
  • Catheter Ablation*
  • Female
  • Fluorodeoxyglucose F18
  • Follow-Up Studies
  • Gastrointestinal Neoplasms / diagnostic imaging
  • Gastrointestinal Neoplasms / secondary
  • Gastrointestinal Neoplasms / surgery
  • Humans
  • Kidney Neoplasms / diagnostic imaging
  • Kidney Neoplasms / secondary
  • Kidney Neoplasms / surgery
  • Lung Neoplasms / diagnostic imaging*
  • Lung Neoplasms / pathology
  • Lung Neoplasms / surgery*
  • Male
  • Middle Aged
  • Multimodal Imaging / methods
  • Multimodal Imaging / standards*
  • Neoplasm Recurrence, Local / diagnostic imaging
  • Positron-Emission Tomography*
  • Radiopharmaceuticals
  • Reproducibility of Results
  • Retrospective Studies
  • Tomography, X-Ray Computed*


  • Radiopharmaceuticals
  • Fluorodeoxyglucose F18