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Malignant thymic epithelial tumors: CT-pathologic correlation.

K J Jung1, K S Lee, J Han

  • 1Department of Radiology, Samsung Medical Center, Sungkyunkwan University, School of Medicine, 50, Ilwon-Dong, Kangnam-Ku, Seoul 135-710, Korea.

AJR. American Journal of Roentgenology
|February 13, 2001
PubMed
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Distinguishing between atypical thymoma and thymic carcinoma is crucial. Thymic carcinomas often present as larger tumors with invasion of great vessels, lymph node enlargement, and phrenic nerve palsy on CT scans.

Area of Science:

  • Thoracic imaging
  • Oncology
  • Pathology

Background:

  • Thymic tumors encompass a spectrum from benign to malignant.
  • Accurate differentiation between atypical thymoma and thymic carcinoma is essential for patient management.

Purpose of the Study:

  • To compare computed tomography (CT) and pathologic findings of atypical thymoma and thymic carcinoma.
  • To identify CT features that differentiate these two thymic malignancies.

Main Methods:

  • Retrospective review of chest CT scans from 27 patients with pathologically confirmed thymic tumors (9 atypical thymomas, 18 thymic carcinomas).
  • Consensus review of CT findings by two radiologists, correlated with pathologic results.

Main Results:

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  • Tumor location was the anterior mediastinum; most had lobulated margins (89%).
  • Thymic carcinomas were significantly larger (mean 7.2 cm) than atypical thymomas (mean 4.7 cm) on CT (p=0.041).
  • Invasion of great vessels, lymphadenopathy, extrathymic metastases, and phrenic nerve palsy were exclusive to thymic carcinoma. Necrosis, calcification, and effusion showed no significant difference.

    • Conclusions:

    • CT findings of large anterior mediastinal masses with vascular invasion, lymphadenopathy, or phrenic nerve palsy suggest thymic carcinoma.
    • These imaging features aid in differentiating thymic carcinoma from atypical thymoma, guiding clinical decisions.