A 13 year old boy presents with chest pain of 4 weeks duration. There were no associated symptoms. Physical examination showed multiple cervical and axillary lymphadenopathy measuring 2 – 4 cm in diameter, firm, nontender, matted. He had bronchovesicular breath sounds, liver edge was palpable 2 cm below the right costal margin, spleen was palpable 4 cm below the left costal margin. Chest x-ray showed widening of the mediastinum with no calcifications. The most likely diagnosis is:
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