Acute mediastinal mass syndrome after surgical biopsy of a massive anterior mediastinal tumor: a case report.

Background: Mediastinal lymphatic tumors are relatively rare. The prognosis is poor but has improved due to recent advances in treatment strategies. Herein, we report a case of mediastinal lymphoma diagnosed using surgical biopsy, which was complicated by mediastinal mass syndrome due to general anesthesia.

Case Presentation: A 25-year-old man with cough, fever, dyspnea, and night sweats was transferred to our hospital for resection of a large anterior mediastinal tumor. Although his preoperative diagnosis was WHO type B1 thymoma, the clinical findings suggested a lymphoma. A repeat surgical biopsy was performed under general anesthesia. Immediately after extubation, the patient developed acute respiratory failure with hypolucency of the right lung field on chest radiography. He was reintubated immediately and was diagnosed with negative pressure pulmonary edema in the right lung. He was managed with positive-pressure ventilation and his respiratory distress resolved within 5 days. Pathological examination of surgical specimens confirmed the diagnosis of lymphoma.

Conclusion: Surgical biopsy is useful for the diagnosis of mediastinal tumors. However, the risk of perioperative mediastinal mass syndrome should be carefully assessed before administering general anesthesia.