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Axial CT images of mediastinal masses and associated pleural effusions. Most patients with eccentrically positioned masses toward one hemithorax or the other and moderate or large effusions demonstrated a much higher likelihood of only ipsilateral effusions (a, c), while a more centrally positioned large mediastinal adenopathy presents with bilateral effusions (b). a A 16-year-old girl; (b) another 16-year-old girl; (c) a 7-year-old boy. E effusion, M mass
