Hi, the hilar nodes being enlarged for more than four weeks can be from three major and totally different types of diseases; chronic infection(TB), immunological(Sarcoidosis), and cancer(Lymphoma). Many different diseases in each type across the whole spectrum, so the only way to narrow it down is through testing(usually histological)combined with clinical presentation(symptoms). Usually the definitive answer comes from testing a biopsied sample of the lymph nodes or if they aren't easily accessible doing a Bronchoscopy with BAL and taking a sample of lung tissue. The hilar and mediastinal nodes are usually directly accessed by doing a Mediastinoscopy. You should also test negative for TB and HIV.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.