1 cm nodule. Any nodule is abnormal. Nodules greater than a centimeter are considered pathological and worrisome. Certain radiological characteristics make some nodules more serious than others. Other tests like pet scans can help in differentiating malignant nodules from benign ones.
Depends. A lung nodule is a lesion in the lung less than 3 cm in diameter. A larger lesion is often called a mass. Typically a lesion needs to be at least 1 cm before it can be seen. Ct scans can identify much smaller lesions. 60% of nodules are benign but that number is higher in non smokers. Depending on the location of the nodule most can be biopsies with needles or minimally invasive scope (vats).