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Doctor insights on: Pet Scan For Lung Nodule

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Got results for PET scan on lung nodules. Nodules are "undetermined" cuz of size but parotid glands on both side of neck showed "hot". Any relation?

Got results for PET scan on lung nodules. Nodules are "undetermined" cuz of size but parotid glands on both side of neck showed "hot".  Any relation?

No relation: Parotid glands can have chronic inflammation which will show up on a PET scan just like tumors do. But it is unlikely to be anything significant that should worry you. You can ignore it for the time being. ...Read more

Dr. Guido Davidzon
280 doctors shared insights

Pet Scan (Definition)

Pet scans most often use a radioactive form of glucose, the energy source for most of the cells in our bodies. The pet scanner can detect and measure how much of the radioactive glucose analog, f-18 fdg, is in a particular organ or region. The areas using more glucose are hyper metabolic and generally more worrisome. Our brains and sometimes hearts prefer glucose as food, making ...Read more


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What is the lowest intake suv on a pet scan(lung nodule)?

What is the lowest  intake suv on a pet scan(lung  nodule)?

Zero: The lowest suv (standardized uptake value - a semiquantitative measure of metabolism) is zero. The maximum suv in a region of interest is called suv max. Generally, if the lung nodule is less than an suv max of 1, it is likely benign. However, there are plenty of non malignant diseases that can have increased FDG uptake, such as healing fungal lung infections, called granulomas. ...Read more

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Will a 6mm lung nodule show up on a pet scan?

Will a 6mm lung nodule show up on a pet scan?

Maybe: Lung nodules smaller than 10 mm (3/8 inch) can be falsely negative on pet because of limitations of the technology. That means the uptake on the scan is not high enough to be suspicious even though the nodule is actually worrisome. However, some small nodules have enough uptake despite their small size. The pet is not a bad idea for a 6 mm nodule, and if positive, means aggressive evaluation. ...Read more

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9mm lung nodule found lower lobe on abdomininal scan. Follow up scan 6 months later nodule grew to 1.5 cm. PET scan no uptake former smoker 15 yrs ago?

Needs Biopsy: Follow the treating Physician's advise. With rapid increase in 6 months; getting tisuue Dx is always very helpful. Other wise you will be worried all the time until another Imaging study is done . Excision Bx is the way to go ( removing the nodule) ...Read more

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Can there be a difference in a CT and pet scan of 1mm in the results of a lung nodule?

Can there be a difference in a CT and pet scan of 1mm in the results of a lung nodule?

Yes: There are differences in techniques between the ct scan with a pet scan and a general ct scan. Additionally, radiologists may measure a nodule slightly differently. Please look at a ruler and realize just how small 1 mm is. Radiologists routinely are measuring things less than 1 cm or about 3/8 of an inch. ...Read more

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Had an MRI of a lung nodule that is non calcified ... Slow growing since 2001... 9mm... Radiologist made diagnoses of it being benign . How can he make such a diagnoses without truly knowing isn't a CT pet scan better to show or even a biopsy?

Had an MRI of a lung nodule that is non calcified ... Slow growing since 2001... 9mm... Radiologist made diagnoses of it being benign . How can he make such a diagnoses without truly knowing isn't a CT pet scan better to show or even a biopsy?

D/w your MD: It looks like a benign tumor--over 11 years- it grows slowly and the size is only 9mm. If this were a cancer, the growth will be way more rapid than this is. A pet scan has some degree of false negativity when the size is < 10mm. A biopsy is invasive and it's not easy to do when the size is small. Would recommend surveillance only, & quit smoking .If you smoke. (btw, ct scan is better than mri). ...Read more

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Are subcentimeter lung nodules that have not changed in size since january assumed to be benign if they do not light up on a pet scan. All are 6 mm?

Not necessarily : Six millimeter nodules are small and may not light up in a pet scan even if malignant. However, the fact they are stable is encouraging. I would guess your doc will keep an eye on them unless there's something else that is suspicious for cancer. Good luck. ...Read more

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Multiple lung nodules measure 2- 6mm all test have been ran all were negative .1.5cm lymph node axilla are all of them to small for pet scan?

Multiple lung nodules measure 2- 6mm all test have been ran all were negative .1.5cm lymph node axilla are all of them to small for pet scan?

maybe: The lower limit of detection for pet scan is ~1cm. The lung nodules are too small but the axillary lymph node should be large enough for pet scan to detect if there is increased metabolic activity. ...Read more

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Lung (Definition)

Deoxygenated blood enters the lungs from the right side of the heart and travels to the lungs. When you inspire, oxygen flows into the lungs, transverses the capilliares and attaches to hemoglobin down a gradient. At the same time, co2 diffuses into the capilaries and is expelled with exhalation. Oxygen rich blood then flows to the left side of the heart and into the ...Read more


Dr. Loki Skylizard
289 doctors shared insights

Lung Nodule (Definition)

A lung nodule is a symptom in which a person has a chest x-ray or CT scan that shows a small lump (nodule) in a lung. A lung nodule can be cancerous or non-cancerous. If cancerous, it can be a lung cancer or can be a metastatic cancer that spread from another ...Read more