I suppose it's fitting to start this community off with a case of one of the most common causes of morbidity and mortality in the world - smoking.
This patient presented to the emergency department for symptoms I no longer recall (probably shortness of breath or chest pain), which prompted a CT of the chest, whereupon the large spiculated mass in the right upper lobe was discovered. The lungs also demonstrate the typical findings for centrilobular emphysema. To my shame, I did not even notice the pack of cigarettes caught in the very same image at the time - it was the ED doc that noticed it when I called to notify about the lung mass.
