Is an 8mm lung nodule followed up by another scan?

Lung nodule: Short term follow up is recommended ( every 6 months) for up to 2 years. If it increases in size then a pet scan and possible biopsy can be performed.

Fleischner: You may want to look up the fleischner society recommendations for follow-up of small pulmonary nodules. Many institutions use these guidelines for follow-up. Follow-up depends on your risk factors and the visual appearance of the nodule.

Almost always, yes: Depends on your history and the appearance/location/shape of the nodule, but most often a follow up CT scan is the most appropriate test. Occasionally, if your doctor is concerned a PET scan may be useful for 8mm, but if its negative it is less helpful than when you have a larger nodule, for which PET is more reliable at excluding the likelihood of cancer.