CTICasesLarge Cervico-Mediastinal Cyst
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Imaging findings
A large cystic mass is seen extending from the neck into the superior mediastinum, causing significant mass effect on the airway and other structures at the thoracic inlet, splaying them out. The mass extends inferiorly to approximately the level of the aortic arch and superiorly above the subaortic airway. The cyst appears to be centered in the neck and displaces the thyroid gland.
Key takeaways
Large cystic masses in the cervico-mediastinal region pose a diagnostic challenge, with key differentials including branchial cleft cysts and thymic cysts. The location and origin of the cyst (centered in the neck, displacing the thyroid) can help narrow the differential, favoring a branchial cleft cyst in this case, although pathological confirmation is pending.
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