A 62-year-old man was admitted to our hospital with a concern of productive cough, profuse hemoptysis, and intermittent breathlessness for about 5 months. He had a 50-year history of cigarette smoking and had stopped smoking 5 months prior to being seen.
When the symptom of hemoptysis occurred 5 months earlier, chest radiography and computed tomography (CT) revealed a ground-glass opacity in the left upper lobe. The patient was treated with an antifibrinolytic agent (tranexamic acid), and the hemoptysis gradually improved and follow-up chest radiography showed resolution of the lesion (Figure 1). However, about 1 month later, hemoptysis reoccurred and increased volume and frequency over the following 4 months.
Lee K, Liang H, Chung C, Hsiao S, Shih C. Pulmonary Air Crescent Sign. JAMA Surg. 2014;149(1):97-98. doi:10.1001/jamasurg.2013.796