Atypical Pulmonary Carcinoid Tumor with Elevated Serum ProGRP;Report of a Case

We report a case of an atypical pulmonary carcinoid with high serum ProGRP. A 78-year-old man was found to have an abnormal shadow by a chest X-ray. Chest computed tomography (CT) revealed a solitary pulmonary nodule in the right middle lobe, which was homogeneous, well demarcated, and round. The level of serum ProGRP was elevated to 104.6 pg/ml (normal<81 pg/ml). The nodule was suspected to be a pulmonary carcinoid tumor, and a right middle lobectomy with mediastinal lymph node dissection was performed. Histopathological diagnosis was an atypical pulmonary carcinoid. Pro-GRP decreased to be normal level 5 month after operation.