FIGURE 1.

Typical imaging findings in a malignant pleural effusion. a) A chest radiograph of a large right-sided malignant pleural effusion with an associated mass in the right upper zone; b) an axial slice from thoracic computed tomography (CT) in a patient with a large right-sided malignant pleural effusion, showing a thickened abnormal pleural with a distinct pleural-based mass lesion amenable to biopsy (arrow); c) a thoracic ultrasound image of large malignant effusion (E) with a markedly thickened parietal pleura (pleural thickening (PT)). Atelectatic lung (L) is seen in the effusion, and the highly echogenic diaphragmatic pleura (D) on the right.