case_images: PMC5167287_01
case_images: (A) Chest radiograph and (B) computed tomography at the time of presentation in 2015 showing a pleural-based opacity involving middle and lower zones of left hemithorax.
case_images: RCR2-5-0-g001.jpg
case_images: PMC5167287_01_RCR2-5-0-g001.jpg
case_images: rcr2205-fig-0001
case_images: A chest X-ray (CXR) and computed tomography (CT; Fig. 1) showed a large left-sided pleural-based low-density mass resembling a pleural effusion.
case_images: (A) The excised tumour weighed 2.2 kg. (B) Histologically, it was characterized by bland spindle-shaped cells arranged in fascicles (haematoxylin-eosin, original magnification x200) with (C) focal nuclear beta-catenin positivity (original magnification x200).
case_images: RCR2-5-0-g002.jpg
case_images: PMC5167287_01_RCR2-5-0-g002.jpg
case_images: rcr2205-fig-0002
case_images: The mass (Fig. 2A), which weighed 2.2 kg, occupied the anterior mediastinal recess at the level of left internal mammary artery and involved the second and third intercostal recessions. The lesional tissue showed bland spindle-shaped cells arranged in intersecting fascicles (Fig. 2B). There was patchy cytoplasmic staining for smooth muscle actin and nuclear staining for beta-catenin (Fig. 2C).