Ventriculopleural shunt CSF pseudocyst presenting as an anterior mediastinal mass.

An asymptomatic middle-aged man presented for routine preoperative chest radiographs prior to the resection of a Masson's tumour of the frontal sinus. The chest radiographs revealed a large anterior mediastinal mass (figure 1). A CT scan of the chest was subsequently performed for further evaluation, demonstrating a cystic mass abutting the right anterior mediastinum with homogenous fluid attenuation (figure 2). A catheter could be seen extending from the soft tissues of the neck and coiling within the mass. Correlation with the head CT led to a diagnosis of pleural cerebrospinal fluid (CSF) pseudocyst associated with a ventriculopleural shunt. On further discussion with the patient, it was revealed that he had undergone ventriculopleural …