CT can detect some tumors, but it is not guaranteed to detect all the existing tumors, and it is recommended to combine with many kinds of auxiliary examinations to make a comprehensive judgment. CT is to use X-ray beam to scan a certain thickness of the human body inspection site, with the advantages of high resolution, no interference of tissue structure outside the fault, etc. For most of the tumors growing in the human body, it has a high detection rate of lesions and diagnostic accuracy, such as tumors in intracranial area, lungs, kidneys, livers, etc., which can clearly show its internal features, edge conditions and surrounding signs, etc. However, for some diseases or smaller lesions, such as small metastatic tumors, pituitary microtumors, it is recommended to combine with various auxiliary examinations to make a comprehensive judgment. However, for certain diseases or smaller lesions, such as small metastatic tumors, pituitary microadenomas, etc., the detection and diagnostic value of CT for tumors is limited. Meanwhile, due to the differences in the number of scanning layers, coverage, image quality and resolution of different CT equipments, there may be cases in which the lesions cannot be detected or it is difficult to make a clear diagnosis even though the lesions are detected. It is recommended that patients should go to regular hospitals, and according to the instructions of doctors, combine CT, MRI, tumor markers, pathological examination, etc., and also combine with the symptoms and signs of patients to carry out comprehensive analysis and diagnosis.