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(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.
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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.
(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).
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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).