Explain this report to me
Reading File
Here is a plain-language explanation of this report:
What Is This Test?
This is an F18-FDG PET-CT scan - a whole body imaging test that uses a radioactive glucose tracer (fluorodeoxyglucose, or FDG) to detect cancer cells. Cancer cells consume more glucose than normal cells, so they "light up" (show as FDG-avid) on the scan. It was done at Dr. Solav's Spectlab, Pune, for a 49-year-old male patient, Ithape Sandip Tanaji.
Why Was This Scan Done? (Purpose)
The patient came in with several concerning symptoms:
- 5 kg weight loss in 3 months
- Dysphagia - difficulty swallowing
- Dysarthria - difficulty speaking/slurred speech
- Brain MRI showed some abnormal areas (T2/FLAIR hyperintense spots) in the frontal regions - possibly related to small vessel disease
- Nerve conduction tests (EMG/NCV) showed damage to the nerve supply of muscles involved in swallowing (bulbar muscles) and in the cervical/lumbar spine region
- Blood tests: Hemoglobin 12.8 g/dL (mildly low/anemic), WBC 4210/mL (normal), Platelets 2.21 lakh/mL (slightly low), Thyroid (TFT) normal
The doctors suspected a paraneoplastic syndrome - a condition where a hidden (occult) cancer somewhere in the body is causing nerve and brain damage remotely, even before the tumor is clearly detected.
What Was Done? (Method)
- A radioactive glucose tracer (5.8 mCi of F18-FDG) was injected intravenously
- Images were taken 60 minutes later using a Biograph-Horizon PET-CT machine
- Blood sugar at the time was 93 mg/dL (normal, which is important for scan accuracy)
- Patient weight: 45 kg
What Did the Scan Find? (Findings)
| Finding | Meaning |
|---|---|
| RT in situ | Likely refers to the patient being in the scanner correctly (routine note) |
| No FDG avid lesion in oral cavity, pharynx, larynx, esophagus, stomach or bowel | No cancer lighting up in these digestive/throat areas |
| Ametabolic left maxillary polyp, 13 mm | A small growth (polyp) in the left cheek sinus - it is NOT metabolically active, meaning it is almost certainly benign (non-cancerous) |
| No well-defined lung nodules | No suspicious lung masses |
| Ametabolic left para-aortic node | A lymph node near the aorta (main artery) that is also NOT active on FDG - likely benign |
| No FDG avid lesion in liver, spleen or adrenal | No cancer detected in these organs |
| No FDG avid skeletal deposits | No cancer spread to bones |
| Physiological uptake in brain precludes detailed evaluation | The brain normally uses a lot of glucose, so it always "lights up" on FDG PET - this makes it impossible to detect small brain lesions with this scan |
The Key Conclusion (Comments)
"No FDG avid occult primary."
This means: No hidden cancer was found anywhere in the body on this scan.
However, the radiologist adds an important note:
"Suggests Ga68 FAPI scan - weight loss as signet ring cell, mucinous carcinomas and NET may be cold on FDG."
This is saying:
- Certain types of cancer - signet ring cell carcinoma, mucinous carcinoma (both types of stomach/bowel cancer), and NETs (neuroendocrine tumors) - are known to NOT light up well on FDG PET scans. They can be "FDG-cold," meaning they are invisible on this particular scan even when present.
- Therefore, the radiologist recommends a different, more sensitive scan: a Ga-68 FAPI PET scan, which uses a different tracer and can detect these tumors that FDG misses.
Summary in Simple Terms
The scan was done to look for a hidden cancer that might be causing the patient's nerve damage and neurological symptoms (suspected paraneoplastic syndrome). This FDG PET-CT scan did not find any obvious cancer. However, because certain cancers are invisible on FDG scans, the radiologist is recommending a follow-up Ga-68 FAPI scan to rule out those specific cancer types before concluding that no cancer exists.
Important: This explanation is for informational purposes only. The patient and family should discuss these findings directly with the treating doctor (referred by Dr. Kashibai Nawale Hospital), who can interpret results in the full clinical context and decide on next steps.
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