The pleural thickening as it is in the apical portion of the lung, its likely to be due to tuberculosis. This could also be fibrous tissue from an old lesion. This is correlated with clinical symptoms , like cough, evening rise of temperature, weight loss and blood tests, which will show a raised ESR and increased lymphocyte count, if it is an active infection. So, don't worry and you can post any further queries you have, will be glad to answer.
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