A 54-year-old man presented with progressive dyspnoea and non-productive cough for 2 months. A physical examination revealed diminished breath sounds and dullness to percussion on the right side. A preoperative chest radiograph for elective left knee arthroplasty 2 months prior to this presentation showed a 16 mm nodule in the right middle lung field (figure 1A).

A CT pulmonary angiogram obtained 1 month after left knee arthroplasty for the complaint of dyspnoea did not reveal pulmonary embolism, however, a well-circumscribed, homogeneous 5.2 cm pleural-based mass was found in right lower haemithorax (figure 1B). A core-needle biopsy revealed nonspecific fibrocellular proliferation. A follow-up chest X-ray at 2 months showed progression of the mass (figure 1C). Due to a high suspicion for malignancy, a positron emission tomography-CT (PET-CT) chest was obtained, which showed a heterogeneously hypermetabolic uptake of 5.1 standardized uptake value (SUV) (figure 1D)....]]> 2021-07-19T10:03:53-07:00 info:doi/10.1136/thoraxjnl-2020-216193 hwp:master-id:thoraxjnl;thoraxjnl-2020-216193 BMJ Publishing Group Ltd 2021-08-01 Chest clinic 76 8 848 849