Scholarlink

Background <p>Mature mediastinal teratomas are uncommon benign germ cell tumors. When the cystic component predominates and typical features such as fat or calcification are absent, diagnosis can be misleading.</p> Case Summary <p>A 17-year-old male had a brief syncopal episode two months prior. At presentation, his primary complaint was mild chest tightness. Chest computed tomography showed a 13.6 × 10.3 × 7.9&#xa0;cm homogeneous cystic mass in the anterior mediastinum, closely attached to the pericardium. Attenuation measured 17 ± 15 Hounsfield units on non-contrast computed tomography, consistent with fluid density and showing no enhancement. Transesophageal echocardiography confirmed that the lesion compressed but did not invade the heart, indicating an extrapericardial mass. It was initially diagnosed as a pericardial cyst. Because of its large size and dense pericardial attachment, the tumor was resected via median sternotomy. Histology demonstrated mature cystic teratoma. Recovery was uneventful.</p> Conclusion <p>Cyst-dominant teratoma can closely resemble a pericardial cyst on computed tomography. Using complementary imaging such as transesophageal echocardiography or magnetic resonance imaging helps avoid misinterpretation. Early complete removal ensures accurate diagnosis and excellent prognosis.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Giant mature mediastinal teratoma mimicking a pericardial cyst

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月4日

查看全文
  • Fei Liang,
  • Hao Lin

摘要

Background

Mature mediastinal teratomas are uncommon benign germ cell tumors. When the cystic component predominates and typical features such as fat or calcification are absent, diagnosis can be misleading.

Case Summary

A 17-year-old male had a brief syncopal episode two months prior. At presentation, his primary complaint was mild chest tightness. Chest computed tomography showed a 13.6 × 10.3 × 7.9 cm homogeneous cystic mass in the anterior mediastinum, closely attached to the pericardium. Attenuation measured 17 ± 15 Hounsfield units on non-contrast computed tomography, consistent with fluid density and showing no enhancement. Transesophageal echocardiography confirmed that the lesion compressed but did not invade the heart, indicating an extrapericardial mass. It was initially diagnosed as a pericardial cyst. Because of its large size and dense pericardial attachment, the tumor was resected via median sternotomy. Histology demonstrated mature cystic teratoma. Recovery was uneventful.

Conclusion

Cyst-dominant teratoma can closely resemble a pericardial cyst on computed tomography. Using complementary imaging such as transesophageal echocardiography or magnetic resonance imaging helps avoid misinterpretation. Early complete removal ensures accurate diagnosis and excellent prognosis.