Calcifying fibrous pseudotumour of the lung

A 2.5 cm mass abutting the right hilum was found on an employment screening chest radiograph in a 31 year old asymptomatic man (fig 1). Chest CT scans with and without contrast showed a non-enhancing soft tissue mass with no fat or calcification (fig 2). T2 weighted MR images excluded a cystic fluid collection. At 6 month follow up a repeat CT scan showed a 4 mm increase in size and a right middle …