I went to an urgent care facility and was given a chest x-ray. The Doctor told me I had a dense left upper lobe opacity resembling pneumonia. she instructed me to follow up with my family doctor as well as another x-ray after I finished my antibiotics. She said it looked mass like and wasn t sure if it was pneumonia or a tumor. I had my family doctor and a radiologist look at the x-ray and both said it resembled Pneumonia. The radiologist thinks it looks like pneumonia along the lung fissure on an angle making it look mass like. I was told that it is not common to have pneumonia in the left upper lobe which really worries me. I have been coughing up mucus, yellow in color. I m a 33 year old female non-smoker. Should I be worried? My boyfriend is just getting over a nasty cold and was coughing up the same type of mucus.