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.
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