Management of Subcentimeter Pulmonary Nodules and Hepatic Lesions

Pulmonary Nodule Management

The American College of Radiology recommends reviewing prior imaging immediately to establish stability, as 2-year documented stability in solid subcentimeter nodules essentially confirms benignity 1, 2
For patients with bilateral subcentimeter nodules, the risk of malignancy is low (<1% risk for nodules <6mm), and follow-up chest CT at 6-12 months using low-dose technique without IV contrast is recommended 1, 2, 3
The use of thin-section (1.5mm) contiguous slices with multiplanar reconstructions is recommended for accurate nodule characterization and volumetric assessment 1, 2, 3
The American College of Radiology advises against using IV contrast for nodule surveillance, as it is not required to identify, characterize, or determine stability of pulmonary nodules 1, 4, 3
If nodules remain stable at 6-12 months, consideration can be given to returning to routine surveillance or discharge from follow-up depending on overall risk profile 1, 3

The American Association for the Study of Liver Diseases recommends obtaining dedicated multiphasic contrast-enhanced CT or MRI of the liver to definitively characterize hypodense lesions 6, 7
For lesions >2cm, a single multiphasic contrast study (CT or MRI) showing typical HCC hallmarks can establish diagnosis in cirrhotic patients 6, 8
For lesions 1-2cm, two concordant dynamic imaging studies showing typical HCC features are required for non-invasive diagnosis 6, 8
For lesions <1cm, follow-up with ultrasound every 3-4 months for the first year is recommended if benign features are confirmed 6, 8, 7
Biopsy is mandatory if imaging shows atypical enhancement patterns, inconclusive findings, or features discordant with simple cysts 6, 7
Core needle biopsy is preferred over fine needle aspiration for accurate histological diagnosis 7
Repeat biopsy is required if initial histology is inconclusive, discordant with imaging, or if the lesion grows during surveillance 6, 7

The American College of Radiology states that an 8mm tracheal diverticulum is an incidental finding requiring no intervention 1
Bilateral apical fibrotic changes and degenerative spine changes are chronic findings not requiring acute management 1
Osseous hemangiomas are benign and require no follow-up 1