Acta Academiae Medicinae Sinica

Acta Academiae Medicinae Sinica

Acta Academiae Medicinae Sinica ›› 2018, Vol. 40 ›› Issue (4): 468-472.doi: 10.3881/j.issn.1000-503X.10365

• Original Articles • Previous Articles     Next Articles

Chest CT Findings of Primary Neuroendocrine Tumor of Thymus:Analysis of 7 Cases

YAN Fei, JIN Xin, ZHANG Xinghua, WU Jian()   

  1. Department of Radiology,Chinese PLA General Hospital,Beijing 100853,China
  • Received:2018-03-05 Online:2018-08-30 Published:2018-09-08

Abstract:

Objective To explore the clinical features of primary neuroendocrine tumor of thymus (pNET) on computed tomography (CT). Method CT findings and clinical features of 7 patients with pathologically confirmed primary pNET were retrospectively analyzed. Results There were 2 male and 5 female patients aged (52.1±13.3) years,without accompanying endocrine symptoms. Three patients had low-and intermediate-grade pNET and 4 had high-grade pNET. CT showed solid masses in the anterior mediastinum with heterogeneous density,and the average maximum diameter was 6.6 cm. Five patients had necrosis and 4 patients had calcification. After contrast administration,5 cases showed flower ring-like enhancement and 2 cases showed rim enhancement. All lesions showed invasive features,including vessel encompassment (n=5),involvement of surrounding fat space (n=4),involvement of the pleura (n=3),involvement of pericardium (n=2),involvement of chest wall (n=1),direct lung involvement (n=2),lymphadenopathy (n=1),and primary renal neuroendocrine tumor with lung metastasis (n=1). Conclusion pNET is mainly seen in middle-aged people. The typical characteristics of pNET on CT include large mass,calcification,necrosis,and flower ring-like enhancement. CT can clearly display the pNET and the involvement of its surrounding tissues and therefore is helpful for preoperative diagnosis and WHO classification of pNET.

Key words: thymus, neuroendocrine tumor, computed tomography

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