CONCLUSION
This case illustrates the importance of recognizing the potentially indolent course that thymoma, specifically subtype B2, can exhibit. The patient’s unique presentation and gradual progression of symptoms allowed for a meticulous and well-considered approach to her treatment, ultimately leading to the decision of surgical intervention. Recurrence rate for thymoma is high, implying a necessity for a tailored treatment approach and postoperative surveillance strategy. In addition, our case highlighted the effectiveness of fluoroscopy guided pericardiocentesis as a safe and effective procedure for both symptom relief and cytological examination in patients with thymoma.