Journal of the Korean Society of Radiology (대한영상의학회지)

The Korean Society of Radiology (대한영상의학회)
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Sarcoid-Like Reaction after Complete Remission of Malignancy: CT and 18F-FDG PET/CT Features for the Differential Diagnosis from Lymph Node Metastasis

악성종양의 완전관해 후 발생한 사르코이드증 유사 반응: 림프절 전이와의 감별진단에 유용한 CT와 18F-FDG PET/CT 소견

  • Hyun Ji Kang (Department of Radiology, College of Medicine, Ewha Womans University) ;
  • Yookyung Kim (Department of Radiology, College of Medicine, Ewha Womans University) ;
  • June Young Bae (Department of Radiology, College of Medicine, Ewha Womans University) ;
  • Jung Hyun Chang (Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, College of Medicine, Ewha Womans University) ;
  • Soo-Hyun Lee (Department of Radiology, National Cancer Center)
  • 강현지 (이화여자대학교 의과대학 영상의학과) ;
  • 김유경 (이화여자대학교 의과대학 영상의학과) ;
  • 배준영 (이화여자대학교 의과대학 영상의학과) ;
  • 장중현 (이화여자대학교 의과대학 호흡기내과) ;
  • 이수현 (국립암센터 영상의학과)
  • Received : 2020.05.05
  • Accepted : 2020.09.15
  • Published : 2021.07.01
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Abstract

Purpose To identify the imaging features indicative of sarcoid-like reactions in patients with intrathoracic lymphadenopathy after complete remission of malignancies. Materials and Methods This study enrolled five patients with histopathologically confirmed sarcoid-like reactions that developed after cancer remission. The clinical features and findings of CT and 18F-fluorodeoxyglucose (FDG) PET/CT were assessed. Results The underlying malignancies included breast, nasopharyngeal, colon, and endometrial cancer and lymphoma. The time intervals between complete remission of malignancy and the diagnosis of sarcoid-like reaction ranged from 6 to 78 months. CT findings of sarcoid-like reaction included bilateral hilar and mediastinal lymphadenopathies (n = 5), pulmonary nodules (1-15 mm) with peribronchovascular, fissural, or subpleural distribution, and interlobular interstitial thickening in the lungs (n = 4). 18F-FDG PET/CT revealed hypermetabolic uptake in the mediastinal and hilar lymph nodes and both lungs in the absence of extrathoracic uptake (n = 3). The sarcoid-like reactions resolved in all patients after corticosteroid treatment. Conclusion In patients with complete remission of malignancies, newly developed bilateral hilar and mediastinal lymphadenopathies with or without pulmonary nodules of perilymphatic distribution, in the absence of recurrence at the primary tumor site and extrathoracic metastasis, may suggest a sarcoid-like reaction. Such cases warrant histologic evaluation of the lymph nodes to prevent unnecessary systemic chemotherapy.

목적 악성 종양의 완전 관해 후 발생한 흉강 내 림프절병증 환자에서 사르코이드증 유사 반응을 시사할 수 있는 영상의학적 특징을 알아보고자 한다. 대상과 방법 이 연구는 악성 종양의 완전 관해 상태에서 발생한 조직병리학적으로 확인된 사르코이드증 유사 반응을 보인 5명의 환자의 임상적 특징과 CT 및 18F-fluorodeoxyglucose(이하 FDG) PET/CT 소견을 분석하였다. 결과 기저 악성 종양으로는 유방암, 비인두암, 자궁내막암 및 림프종이 포함되며. 악성 종양의 완전 관해와 사르코이드증 유사 반응 진단 사이의 시간 간격은 6~78개월이었다. CT 소견으로는 양측 폐문 및 종격동 림프절병증(n = 5), 기관지혈관주위, 엽간열주위 또는 흉막하 폐결절(1~15 mm) 및 소엽내 간질비후가 포함되었다(n = 4). 18F-FDG PET/CT는 흉강 외 FDG 흡수 없이 양측 폐문 및 종격동 림프절의 대사항진을 나타냈다(n = 3). 모든 환자에서 코르티코스테로이드 치료 후 사르코이드증 유사 반응이 호전되었다. 결론 악성 종양의 완전 관해를 달성한 환자에서, 원발성 종양의 재발과 흉강 외 원격 전이 없는 상태에서 새로 발견된 양측 폐문 및 종격동 림프절병증은 림프관주위 폐결절의 유무에 관계없이 사르코이드증 유사 반응의 가능성을 시사할 수 있으며 불필요한 전신 화학요법을 예방하기 위해 림프절의 조직병리학적 확인이 필요하다.

Keywords

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