The PNI-RADS classification is primarily used for the examination of lung nodules and can be categorized into six grades based on the results of the examination.
Grade 1 means that no nodule is found; grade 2 means that the nodule is benign; grade 3 means that the nodule is undetermined; grade 4 means that the nodule is suspected to be malignant; grade 5 is that the CT screening is strongly suggestive of a malignant nodule; and grade 6 is that the nodule has been confirmed to be malignant by histology.
The fourth grade can be divided into three levels of ABC, with 4A showing a higher risk of malignant nodules, 4B suggesting carcinoma in situ or minimally invasive carcinoma, and 4C representing a very high likelihood of malignancy.
For different grades, different methods are chosen clinically. Grade 1 only requires routine screening, while grades 2, 3, and 4 can be selected for no follow-up, follow-up, long-term follow-up, and further examination according to the severity, respectively. Grade 5 often requires further testing to confirm the diagnosis. Grade 6 has been diagnosed as a malignant tumor, and the next step of treatment should be actively pursued.
PNI-RADS classification can effectively determine the condition of lung nodules and indicate the benign or malignant nature of the nodules, and the next step should be taken under the guidance of the physician according to the results of different classifications.