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Updated: May 23, 2026

Local Anesthetic Thoracoscopy for Undiagnosed Pleural Effusion
Published on: November 10, 2023
Chylous pleural effusion caused by mediastinal angiomyolipomas
Wei-li Han1, Jian Hu, Aizemaiti Rusidanmu
1Department of Thoracic and Cardiovascular Surgery, the First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang 310003, China.
Mediastinal angiomyolipomas, rare benign tumors, can cause massive chylous pleural effusion in males. Histological and immunohistochemical analysis confirmed the diagnosis in a unique case study.
Area of Science:
- Oncology
- Pathology
- Thoracic Surgery
Background:
- Angiomyolipomas are typically benign tumors composed of fat, vascular, and smooth muscle tissues.
- Mediastinal angiomyolipomas are exceptionally rare, with limited documented cases.
Observation:
- A male patient presented with a mediastinal mass and significant chylous pleural effusion.
- The effusion was characterized as chylous, indicating lymphatic fluid accumulation.
Findings:
- Histological examination revealed a tumor consistent with angiomyolipoma.
- Immunohistochemical staining supported the diagnosis of mediastinal angiomyolipoma.
Implications:
- This case highlights the potential for angiomyolipomas to occur in the mediastinum.
- It underscores the importance of considering rare diagnoses in cases of massive chylous pleural effusion.
- Further research may elucidate the specific pathogenesis of mediastinal angiomyolipomas.
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