Hi there. Localized adenopathy should prompt a search for adjacent precipitating lesion and examination of other nodal areas to rule out generalized lymphadenopathy. 3 to 4 weeks period of observation is acceptable if the clinical picture is benign. Excisional biopsy of the most abnormal node will enable the pathologist to determine the diagnosis. The causes for lymphadenopathy may be obvious like sore throat and tender cervical lymph nodes, other serious illnesses like lymphoma, AIDS, or metastatic cancer. Like your report mentions these enlarged lymph nodes can be a common symptom of infectious and malignant disease. Reactive causes are infection acute bacterial or viral, chronic like tuberculous lymphadentis. Infectious mononucleosis,, toxoplasmosis, etc. Tumoral lymphadenopathy includes primary like hodgkin’s and non-hodgkin lymphoma, secondary including metastasis. There could be autoimmune etiology like SLE, rheumatoid arthritis and immunocompromise like AIDS. The causes of bilateral hilar lymphadenopathy are tuberculosis, sacrcoidosis, extrinsic allergic alveolitis, malignancy like lymphoma, carcinoma organic dust like silicosis. Your pulmonologist and pathologist would need to do a thorough assessment to discern the pathology. Hope this helps. Take care.