%0 Journal Article %T Mature Teratoma Revealed by an Encysted Pleural Effusion %A Houda Gharsalli %A Monia Attia %A Sarra Zairi %A Imen Sahnoun %A Aida Ayadi %A Henda Neji %A Sonia Maalej %A Leila Douik ElGharbi %J Open Journal of Respiratory Diseases %P 84-89 %@ 2163-9418 %D 2021 %I Scientific Research Publishing %R 10.4236/ojrd.2021.112008 %X A 32-year-old patient with no previous history was admitted for chest pain, dyspnea, appetite and weight loss. Chest X-ray revealed an opacity involving the lower two-thirds of the right hemithorax, suggestive of a pleural effusion. Because of the absence of fluid return even after ultrasound-guided thoracentesis, a Chest Computed tomography was required showing a heterogeneous anterior mediastinal mass with soft tissue, fat, fluid and calcifications associated with extensive encysted fluid collection in the right hemithorax. A video-assisted mini-thoracotomy revealed a mediastinal tumor firmly attached to the thymus with a cystic wall lined by squamous epithelium and sebaceous gland composed of respiratory tissue, adipose tissue, cartilage, smooth muscle fibers, and well-differentiated pancreatic tissue. These findings led to the diagnosis of a mature thymic teratoma. The patient was discharged 7 days after surgery, with no recurrence on follow-up. %K Tumor of the Mediastinum %K Mature Teratoma %K Pleural Effusion %U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=109466