Mediastinal adenopathy & left hilar adenopathy only with no other symptoms other than adult onset asthma 4 months ago?could this be cancer 51nonsmoker, clean mamagram 2, please what else could it be

Lymphadenopathy: Hi. Yes, this could be cancer. You need tissue for diagnosis. Lung cancer is possible (second hand smoke, radon trapped in house, etc), but so is lymphoma. Your doctor will refer you for a biopsy (probably transbronchial), then you'll know if it's benign or malignant. Good luck!

Leave it alone: If you have no symptoms, the radiologist is just commenting on a few big lymph nodes. There's no figuring out why one person gets a big spleen or a big set of nodes somewhere. These are very unlikely to be anything at all, and if they are, there's no reason to chase down an answer at risk to yourself to make the call early, unless the masses are huge (your physician's call).

There are a number: of causes of mediastinal adenopathy. Inflammatory processes, infections, sarcoid and other granulomatous processes, to name a few. Unfortunately, lymphoma and other neoplasms can do it too. You need to follow-up with your physician to determine the cause of the adenopathy.