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
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Lung, Airway, Malignant tumor, atypical carcinoid,