Rare case of an exceedingly enlarged mediastinal mass in 22-year-old male.

Masses of the mediastinum develop from anatomic structures that pass through or are normally located within this space; they may also occur secondary to metastatic spread from malignancies from other locations. The anterior compartment of the mediastinum can give rise to thymomas, which tend to be restricted to the thymus as well as nearby structures. Their symptoms are associated with their size and impact on nearby structures. This patient, a 22-year-old male with no medical history, presented to the emergency department for evaluation of a cough ongoing for 3 weeks. Chest X-ray and computed tomography (CT) scan of the thorax demonstrated a mass measuring up to 17.2 cm. Afterwards, a CT-guided biopsy was performed, which revealed findings consistent with a benign thymic neoplasm, though due to the specimen being scant, patient was referred to cardiothoracic surgery for resection and excisional biopsy of the mediastinal mass.