Usefulness of $^{18}F-FDG$ PET/CT in the Diagnosis of Cervical Lymph Node Metastases of Head and Neck Cancer

두경부암 경부 림프절 전이의 진단에서 $^{18}F-FDG-PET/CT$의 유용성

  • Kim, Chung-Ho (Department of Radiology, College of Medicine, Catholic University of Korea) ;
  • Kim, Sung-Hoon (Department of Radiology, College of Medicine, Catholic University of Korea) ;
  • O, Joo-Hyun (Department of Radiology, College of Medicine, Catholic University of Korea) ;
  • Yoo, Ie-Ryung (Department of Radiology, College of Medicine, Catholic University of Korea) ;
  • Chung, Yong-An (Department of Radiology, College of Medicine, Catholic University of Korea) ;
  • Park, Young-Ha (Department of Radiology, College of Medicine, Catholic University of Korea) ;
  • Sohn, Hyung-Sun (Department of Radiology, College of Medicine, Catholic University of Korea) ;
  • Lee, Sung-Young (Department of Radiology, College of Medicine, Catholic University of Korea) ;
  • Chung, Soo-Kyo (Department of Radiology, College of Medicine, Catholic University of Korea)
  • 김정호 (가톨릭대학교 의과대학 방사선과학교실) ;
  • 김성훈 (가톨릭대학교 의과대학 방사선과학교실) ;
  • 오주현 (가톨릭대학교 의과대학 방사선과학교실) ;
  • 유이령 (가톨릭대학교 의과대학 방사선과학교실) ;
  • 정용안 (가톨릭대학교 의과대학 방사선과학교실) ;
  • 박영하 (가톨릭대학교 의과대학 방사선과학교실) ;
  • 손형선 (가톨릭대학교 의과대학 방사선과학교실) ;
  • 이성용 (가톨릭대학교 의과대학 방사선과학교실) ;
  • 정수교 (가톨릭대학교 의과대학 방사선과학교실)
  • Published : 2005.10.31

Abstract

Purpose: This study evaluated the diagnostic value of $^{18}F-FDG$ PET/CT in detecting cervical lymph node metastases in head and neck cancer patients. Materials & Methods: The patients were divided into two groups, 46 patients underwent PET/CT scan for initial staging before surgery, and 20 patients for restaging of recurrence after primary treatment. Increased FDG uptakes in cervical lymph nodes were evaluated retrospectively and correlated with the histopathologic results. Results: In the initial staging group, 21 lymph nodes were detected by PET/CT in 15 patients. 20 lymph nodes were confirmed as metastases with a mean peak SUV of 5.84, and the remaining one lymph node was an inflammatory lesion, with a peak SUV of 2.75. Seven metastatic lymph nodes were reported only by histopatholoay. The sensitivity, specificity, positive predictive value and negative predictive value were 74.0%, 99.6%, 95.2% and 97.3%, respectively. In the recurrence group, 11 lymph nodes were detected in 9 patients, and 8 nodes were true positive, with a mean peak SUV of 5.65. The other three were inflammatous lymph nodes, and the peak SUVs were 2.16, 2.94 and 3.53. One false negative lymph node was reported. The sensitivity, specificity, positive predictive value and negative predictive value were 88.8%, 97.7%, 72.7% and 92.9%, respectively. Conclusions: FDG-PET/CT shows higher positive predictive value in the initial staging group, and better sensitivity in the recurrence group. Therefore PET/CT could be useful for both initial staging and restaging of recurrent cervical lymph node metastases.

목적: 두경부암 환자에서 경부림프절 전이의 진단에서의 $^{18}F-FDG$ PET/CT의 유용성을 알아보고자 하였다. 대상 및 방법: 환자들을 수술 전 병기 결정을 위해 PET/CT을 촬영한 환자 46명(수술 전 환자군, 남: 38명, 여: 8명, 평균나이: 54.54세)과 1차 치료 후 재발 병소의 병기 결정을 위해 PET/CT를 시행한 환자 20명(재발 환자군, 남: 15명, 여: 5명, 평균나이: 49.5세)의 두군으로 분류하였다. PET/CT에서 FDG 섭취를 보인 경부림프절을 병소 대 병소로 조직검사 소견과 후향적으로 비교하였다. 결과: 수술 전 환자 15명의 PET/CT에서 21개의 FDG 섭취 증가를 보이는 림프절이 관찰되었다. 이 중 20개가 조직학적으로 림프절 전이로 확진되었고 평균 최대 SUV는 5.84 (2.05-20.39)였다. 나머지 하나의 림프절은 조직 검사에서 염증성 병소로 진단되었고 최대 SUV는 2.75였다. 7개의 림프절전이가 조직검사에서만 발견되었다 민감도는 74.0%, 특이도는 99.6%, 양성 예측도는 95.2% 그리고 음성 예측도는 97.3%였다. 수술 후 환자 9명에서 11개의 림프절전이가 PET-CT에서 관찰되었고, 이 중 8개가 전이로 확진되었고 평균 최대 SUV는 5.65 (3.02-9.84)였다. 나머지 3개의 림프절들은 염증성 병소였고 평균 최대 SUV는 2.87였다. 1개의 위음성의 림프절이 발견되었다. 민감도는 88.8%, 특이도는 97.7%, 양성 예측도는 72.7% 그리고 음성 예측도는 92.9%였다. 결론: FDG-PET/CT은 두경부암 환자의 경부 림프절 전이를 평가하는데 수술 전 환자군에서는 보다 높은 양성 예측도를, 재발 환자군에서는 보다 높은 민감도를 보였다. 그러므로 PET/CT는 두경부암 환자에서 수술 전 환자와 재발 환자의 경부 림프절 전이의 진단에 유용하였다.

Keywords

References

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