Reading your PSMA PET-CT report
PSMA-Avid Lesions: — What the Report Means
If your PSMA PET-CT report uses the word avid, it means the radiotracer has collected at that spot. That is a finding — not a diagnosis. Several normal structures in the body absorb the same tracer, and knowing which ones they are helps you understand what you are reading.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026
- Avid means uptake, not confirmed cancer — The tracer collecting at a site is a finding that needs interpretation, not a verdict by itself.
- Ganglia are a well-known pitfall — Nerve clusters near the stomach and spine can show intense uptake and closely resemble lymph node disease.
- Healing bone also absorbs the tracer — Rib fractures you may not know about can appear avid and be noted in the report.
- Normal tissue is always avid — Salivary glands, kidneys and the urinary tract show uptake on every scan — this is expected and not a concern.
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PSMA-avid means a lesion has absorbed the radiotracer on your scan. The tracer seeks out a protein called PSMA, which prostate cancer cells carry in large amounts. But several normal structures — including celiac ganglia, salivary glands, and healing bone — also express this protein. Your oncologist interprets what each avid finding means. The scan is evidence, not a conclusion.
At CION, a whole-body PET-CT starts from Rs 10,499 — among the lowest published prices in Hyderabad. Indicative price, as of September 2026.
What does PSMA-avid mean on a scan report?
PSMA stands for prostate-specific membrane antigen — a protein that prostate cancer cells carry at very high levels. The radiotracer used in PSMA PET-CT is designed to bind to this protein wherever it is expressed. Where it binds, the scanner records uptake — and that site is described as PSMA-avid.
The intensity of uptake is recorded as a value called SUVmax. A higher number means stronger binding. Intensity alone does not confirm cancer; location, your PSA history, and the full clinical picture all feed into the interpretation.
Each avid lesion in your report is a finding that needs context. Your oncologist reads the report together with your clinical history before drawing any inference about what the finding represents.
Is a PSMA-avid lesion always cancer?
No. This is the most important thing to understand about reading a PSMA scan. Several normal structures express the PSMA protein and absorb the tracer on every scan — they are not cancer, and they are expected findings.
The most significant pitfall is the celiac ganglia — clusters of nerve tissue near the stomach. They can produce intense uptake that closely resembles an enlarged abdominal lymph node. This is a well-documented source of false-positive findings in published PSMA imaging experience.
Sympathetic ganglia along the spine carry the same risk. Healing rib fractures, Paget's disease of the bone, and some inflammatory lesions can also appear avid. An experienced radiologist notes these possibilities in the report.
Which structures in the body are PSMA-avid without being cancer?
- Celiac gangliaNerve clusters near the stomach. One of the most frequently cited false-positive sites in published PSMA PET-CT experience.
- Sympathetic ganglia along the spineCan appear in the same region as paraaortic lymph node disease if not specifically identified by the radiologist.
- Salivary glandsNormal physiological uptake. Present on every scan and noted as a baseline, not a concern.
- Lacrimal glandsTear glands near the eye — PSMA-avid as normal tissue.
- Kidneys and urinary tractThe tracer is excreted through the urine. The kidneys, bladder and ureters will always appear avid.
- Healing rib fracturesBone healing increases PSMA expression. Old or unnoticed fractures can show uptake and appear in the report.
- Paget's disease of the boneA benign bone condition that can produce avid lesions in regions that also raise concern for bony metastases.
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What do the words in your PSMA scan report mean?
- SUVmax
- A number that measures how intensely a lesion absorbed the tracer. Higher values suggest stronger uptake. It does not confirm cancer on its own — location and clinical context matter equally.
- Focal uptake
- Tracer concentration at a specific, identifiable spot rather than spread across a region. Focal findings are named and described individually in the report.
- Physiological uptake
- Normal, expected absorption in tissue that always expresses PSMA — salivary glands, kidneys, urinary tract. Noted in the report as a baseline, not a concern.
- PSMA-negative lesion
- A lesion visible on the CT part of the scan that did not absorb the tracer. Not all prostate cancer expresses PSMA. A negative result does not automatically mean the tissue is benign.
- Likely physiological / probably benign
- Language the radiologist uses when an avid finding sits in a location typical for ganglia or normal tissue, and malignancy at that site is considered unlikely.
What does each finding in a PSMA PET-CT report actually mean?
The report says 'intense uptake' — does that mean the cancer has definitely spread?
Intense uptake raises suspicion and your oncologist will take it seriously. But intensity alone cannot confirm spread. The celiac ganglia routinely produce very intense PSMA uptake in people without metastatic disease — experienced radiologists identify them by anatomical position, not by the uptake value. Your oncologist will combine the SUVmax, the location of the finding, your PSA trend, and your biopsy history before drawing any conclusion about spread.
There is an avid spot near my stomach. Could that be a lymph node with cancer?
It may be, but the celiac ganglia sit in exactly this region and are among the most commonly reported false-positive findings on PSMA PET-CT. A complete report will have considered this. Ask your oncologist whether the radiologist specifically addressed the celiac ganglia, and what reasoning was used to distinguish a lymph node from a ganglion. If genuine uncertainty remains, a targeted biopsy or correlation with other imaging may be proposed before any treatment decision is made.
The previous CT scan did not show this lesion. Does that mean the cancer is new or spreading?
Not necessarily. PSMA PET-CT detects biochemical uptake rather than physical size or shape. A lesion can be too small for standard CT to measure yet still absorb enough tracer to appear clearly on the PSMA scan. This is part of why PSMA imaging was developed — it can identify disease earlier, at a smaller size, than cross-sectional imaging alone. Whether a newly detected finding is early recurrence or a non-cancerous structure is something your oncologist will determine from your full clinical history.
The report says 'PSMA-negative lesion' — does that mean this area is clear?
Not always. A proportion of prostate cancer cells produce little or no PSMA on their surface, particularly in certain tumour variants. A lesion visible on the CT portion of the scan that did not absorb the tracer may still need investigation if your oncologist has clinical reasons for concern. A PSMA-negative result means the scan did not detect uptake at that site — it does not confirm the site is free of disease.
Can the PSMA PET-CT miss cancer that is actually there?
Yes. No imaging test detects every site of disease. Very small deposits may fall below the scan's resolution threshold, and tumour cells that express little or no PSMA will not show uptake even if disease is present. Your oncologist may continue to monitor certain areas on clinical grounds — for example, because your PSA is rising — even when those regions appear clear on the scan. The result is one piece of evidence in a broader clinical assessment.
Did you know?
The celiac ganglia pitfall has been documented in clinical experience with PSMA PET-CT since the technique's early rollout and continues to appear in published case series as one of the most reported sources of false-positive findings worldwide.
Experienced radiologists place these ganglia by their anatomical position near the celiac trunk. Location matters more than uptake intensity when deciding whether a finding in this region is likely to be malignant.
Source: European Association of Nuclear Medicine (EANM) guidelines on PSMA PET-CT interpretation
PET-CT at CION starts from Rs 10,499 — among the lowest published prices in Hyderabad — across 4 partner centres in Banjara Hills, Punjagutta, Himayatnagar and Narayanaguda. Indicative price, as of September 2026.
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Common questions
Frequently asked questions
The report says one avid lesion was found. Does that mean the cancer has spread?
An avid lesion is a finding that needs interpretation, not a confirmed diagnosis of spread. Your oncologist will consider the location, the uptake intensity, how it relates to your PSA, and whether it corresponds to any change on other imaging. Some avid spots are benign structures — ganglia or healing bone. Others do represent disease. The clinical picture as a whole, not the scan report alone, determines what the finding means.
How can the radiologist tell the difference between a lymph node and a ganglion?
Mainly by location. The celiac ganglia occupy a predictable anatomical position near the celiac trunk, and experienced nuclear medicine radiologists recognise this pattern. Shape, CT appearance, and uptake intensity also contribute. When the distinction is genuinely uncertain, the report will say so, and your oncologist may request a targeted biopsy or additional imaging before acting on the finding.
Why did the PSMA scan find something my earlier CT scan did not?
PSMA PET-CT detects biochemical activity, not just physical size. A lesion can be below CT's measurement threshold yet still take up enough tracer to register clearly on the PSMA scan. This is one of the reasons PSMA imaging was developed for prostate cancer staging and restaging. Whether the new finding represents early recurrence or a non-cancerous structure is a clinical interpretation — the scan raises it, your oncologist resolves it.
What happens next after an avid finding is reported?
Your oncologist will review the full report alongside your PSA trend, biopsy history, and any prior imaging. Depending on the number, location, and intensity of findings, the next step may be close monitoring, a targeted biopsy, a change in treatment, or a specialist referral. An avid finding on a PSMA scan opens a clinical conversation — it does not by itself determine what treatment you receive.
Does an avid finding mean I need to start treatment immediately?
Not automatically. The clinical response depends on how many lesions were found, where they sit, how intensely they absorbed the tracer, and how your overall situation has changed since your last assessment. Some findings lead to a treatment change. Others change the monitoring plan without changing treatment. Your oncologist will explain the reasoning behind whichever recommendation they make.
Why would a prostate cancer lesion not show up on PSMA PET-CT?
Some prostate cancers produce very little PSMA on their cell surface, so the tracer has little to bind to and the lesion does not register. This is more common in certain tumour variants and can occur at lower PSA levels. A PSMA-negative result at a site your oncologist is watching for clinical reasons does not clear that site — it means the scan could not detect it, not that nothing is there.