The first thing to be excluded in the diagnosis of a Solitary lung nodule is malignancy. Old age, history of smoking for long duration make the likelihood suspicious of malignancy is high.
CT scan can help in the differentiation between malignant and benign nodule in most of cases. The fact that your doctor has recommended PET means that either he is suspecting cancer or the CT Scan was not of great help to rule out cancer.
In both cases, positron-emission tomographic (PET) scanning would be of great help in the evaluation and in differentiating between benign and malignant disease.
You have to wait again for the results of the pathological examination of the biopsy he will take through bronchoscopy or CT guided according to the mass location (tissue biopsy is mandatory). In addition, you have to complete her work up with abdominal Ultra-Sound to determine the stage of her disease. The treatment approach and prognosis differ according to the pathological type and the extent of the disease.
If the results show benign nodule then a radiological follow up is advisable, stable nodules on follow up are usually benign.
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This answer does not substitute for direct medical consultation.
Dr. Safaa Mahmoud.
MB BCh, MSc Internal Medicine. MD Medical Oncology.
PhD Experimental Medicine and Biochemical Science.