Hi welcome to Healthcaremagic
Hi...., There are various causes for the enlargement of the lymph
node, most common are due to infection like TB, other causes are non infectious granulomatous disorders like sarcoidosis
,... but since the lymphomas are common in the mediastinal group of lymph node enlarge, you must be further investigated to rule out such disorders,.. only biopsy
and Histopathology can give the appropriate result....
Hope I have answered your question..