Lung micronodule border clear is a descriptor of an imaging test that usually focuses on the fact that the lesion has clear borders and is a benign sign.
When a chest radiograph, chest CT, or MRI reveals a clear border, it generally means that the lesion is nodular, very small, and has a clear border, which means that the diseased tissue has not invaded the surrounding tissues and there is no sign of invasive growth, which is a benign sign for a solid nodule, and a malignant sign if the border is not clear.
However, the nature of the nodule cannot be determined solely on the basis of clear borders, but rather on the basis of its growth characteristics and biopsy results.