대한흉부영상의학회 Korean Society of Thoracic Radiology

Discussion

Diagnosis With Brief Discussion

Courtesy

Samsung Medical Center, Seoul Korea

Imaging Findings

Chest PA radiograph shows complete atelectasis.

Enhanced CT scan shows about 2cm sized low attenuation nodule within bronchus intermedius

18F-FDG PET scan shows slight metabolic uptake in atelectatic lung of the right middle and lower lobes. The endobronchial nodule does not show FDG uptake.

Discussion

Atypical carcinoids have clinicopathologic features intermediate between the typical carcinoids and small cell carcinomas. Unlike typical carcinoids, the majority of atypical carcinoids are peripheral (50-100%), are associated with a history of cigarette smoking (83-94%), occur more often in men (2:1) and tend to occur in a slightly older age group (mean age in fifties to sixties). PET with 18F-fluorodeoxyglocose(FDG) findings in patients who have primary pulmonary carcinoid tumor usually have lower FDG uptake than expected for malignant tumors.

Keywords

Lung, Airway, Malignant tumor, atypical carcinoid,