Is a PET-CT SUV value greater than 2.5 necessarily a tumor?

For example, lung nodules 18F-FDG PET SUV >: 2.5, suggesting that malignant tumors are more likely. Many patients inquire about "what is SUV value" on the internet and know SUV >；; 2.5 Prompted the possibility of malignant tumor, so I saw my physical examination report on SUV. 2.5 I'm worried. I wonder if the doctor's diagnosis is wrong, so I've been consulting online. Here I want to tell you that PET-CT diagnosis needs very professional medical literacy. The diagnosis of tumor depends not only on SUV value, but also on its CT image and clinical data. The intake of developer in different parts, physiological intake, blood sugar checked by patients, activity, cold, some inflammation and tuberculosis will all lead to the changes of SUV. For this reason, we specially found a case: it was found that intravenous injection of 18F-FDG was given on an empty stomach, and after rest, whole body PET/CT tomography was performed. The quality of anatomical and functional images is clear. The whole body section showed that after pituitary adenoma surgery and gamma knife treatment, the sella fossa volume increased, pneumatosis was visible, no obvious abnormal soft tissue density shadow was found, and FDG metabolism was normal. The morphology of each brain lobe is normal, no abnormal density shadow is found in brain parenchyma, and FDG metabolism is normal. The radioactive distribution of bilateral basal ganglia and cerebellum is symmetrical. Low density shadow can be seen in sphenoid sinus, but FDG is not absorbed. The morphology and structure of nasopharynx, oropharynx and laryngopharynx are normal; The size and density of thyroid gland are normal, and FDG uptake is also normal. No obvious swollen lymph nodes are found in the neck. FDG was slightly absorbed in bilateral focal soft tissues around the shoulder, and the maximum SUV value was 2.8. No abnormal soft tissue density shadow was found in the same slice CT. Bilateral thoracic symmetry, trachea in the middle. Small nodules were seen in the posterior segment of the upper lobe of the right lung, with clear boundaries and a diameter of about 0.6cm. FDG metabolism was normal. No abnormal density lesions such as nodules and masses were found in the other two lung fields, and no abnormal FDG metabolism was found. No effusion was found in either chest cavity. No bilateral pleural thickening was found. No obvious enlarged lymph node shadow is found in hilum and mediastinum. Myocardial FDG showed normal physiological uptake. The shape and size of the liver were normal, and the density in the liver decreased evenly, with a CT value of 26-40Hu. No abnormal density shadow and abnormal FDG metabolism were found. The shape and size of gallbladder, spleen and pancreas are normal, no obvious nodule and mass density shadow are found, and no abnormal uptake focus is found in FDG. The shape and size of bilateral adrenal glands and kidneys are normal, no obvious calculus shadow is found in bilateral renal pelvis, and FDG uptake is normal. No obvious thickening and nodular changes were found in the stomach wall and small intestine wall, and FDG was absorbed physiologically. The local intestinal wall of ascending colon continued to increase, and the maximum SUV value was 4.6. No obvious thickening and nodular changes were found in the same layer of intestinal wall on CT. No obvious swollen lymph nodes were found in abdominal cavity and retroperitoneum. The prostate is full in appearance, with punctate calcification inside, and no abnormal FDG uptake is found. No abnormal density shadow was found in pelvic organs, no abnormal focus of FDG metabolism was found, and no obvious swollen lymph nodes and effusion were found in pelvic cavity. Bone hyperplasia of cervical vertebra, thoracic vertebra and lumbar vertebra, FDG metabolism is normal. Diagnostic opinion: 1. Small nodules in the posterior segment of the upper lobe of the right lung, FDG metabolism is normal, considered as inflammatory granuloma, it is recommended to follow up. 2. Moderate and severe fatty liver. 3. The local intestinal wall of ascending colon shows a continuous increase in FDG uptake. Considering chronic inflammation, follow-up is recommended. 4. Calcification of prostate. Bilateral scapulohumeral periarthritis of neck, chest and lumbar spine. 5. Chronic inflammation of sphenoid sinus. Changes of pituitary adenoma after operation combined with gamma knife therapy. There is no abnormality in brain FDG metabolism. Therefore, it is difficult to explain the problem simply by SUV. Please follow the doctor's diagnosis. At the same time, in order to prepare the examination results, please strictly observe the examination precautions and cooperate with the doctor's guidance, such as keeping an empty stomach before examination, not talking during rest, keeping quiet and keeping warm; In the process of examination, it is very important to cooperate with the examining doctor to hold his breath, which has an important influence on the examination results.