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1Relating to a hilus or hilum.Radiologic investigations revealed a 5-cm right lung mass with enlarged hilar and mediastinal lymph nodes.; Neither the hilar structures nor the renal pelvis were involved.; The chest x-ray showed no demonstrable superior mediastinal widening, hilar mass, lung mass or pleural effusion.; Gross examination of the abdominal and hilar lymph nodes revealed mild to moderate lymphadenopathy with a yellow, ‘spongy’ cut surface.; In 90% of cases, it affects the lungs, presenting with hilar adenopathy or pulmonary infiltration.