I have given the complete report details of my brother s CT scan.My brother is a non smoker and is of age 29. We havent had any malignant diseases in our close blood relatives.We lead a very healthy lifestyle. I know biopsy can only confirm it. But what is the probability of this being a malignant tumour? CT Chest: Indication: Mass in the left hilium on Xray. Technique: Preliminary high resolution scans followed by post contrast axial spiral scans from lung apices to the adrenals with multiplanar reconstruction. Findings: HRCT shows no signs of emphysema , bronchiectasis or interestitial lung disease. Post contrast scans show a superior mediastinal rounded mass measuring 3cm and this is quite anterior surrounded by some smaller mediastinal masses extending towards the hilium and appearances resemble necrotic abnormal lymph nodes with some associated atelectasis of the adjacent upper lobe. Primary lung lestion with metastases would be less likely than lymphoma. Right hilium looks normal. No subcarinal lympadenopathy is seen. The spleen is not enlarged. Cardiac outline is unremarkable. No pleural or pericardinal effusion is detected. No axillary lymphadenopathy is seen. Epigastric lymph nodes are not enlarged. Splenunculus is seen in the splenic hilium. The pancreas, stomach and liver look normal.The gallbladder is contracted. The tongue of tissue in the left upper zone is probably collapsed left upper lobe related to the constriction of left upper lobe bronchus due to the lymphadenopathy. Impression: Prominent lymphadenopathy in the mediastiinum and left hilium with some minor adjacent left upper lobe atelectasis. There is some stretching of the upper lobe bronchi and some compression. The lymph nodes look necrotic. The spleen is not enlarged. Lymphoma is more likely than pulmonary mass with metasteses.Respiratory consul is recommended. Sarcoidosis usually causes bilateral hilar lymphadenopathy.