0. A case of situs inversus detected on F18-FDG PET/CT during health examination Shih-Fu Wang, Dom-Gene Tu, Yu-Ling Hsu Department of Nuclear Medicine, Ditmanson Medical Foundation Chia-Yi Christian Hospital
Case Report:
A 70-year-old man whose job is a farmer went to our hospital and asked for health check-up. He has no systemic diseases except hyperlipidemia. Occasional cough with sputum was noted. On the day of performing PET/CT scan, his serum glucose level was 100 mg/dl, and he was injected MBq of 18F-FDG intravenously. The patient was imaged after one hour using a dedicated GEMINI GXL(PHILIPS) integrated PET/CT camera. The non-contrast CT scan was used for anatomical landmark and attenuation correction. As a result, his imaging depicted small lung nodules which were probably non-specific, and showed situs inversus incidentally.
The exact etiology of situs inversus is unknown, but an autosomal recessive mode of inheritance has been speculated. There may be a higher prevalence in certain ethnic groups. The overall incidence of this anomaly is of 1:5000 to 1:20,000, being slightly more common in males. Situs inversus may be complete (situs inversus totalis) or partial (situs inversus partialis), confined to either the thoracic or the abdominal viscera. This anomaly apparently does not influence normal life expectancy.
As a rare case of situs inversus detected on FDG PET/CT scan, the patient reminds us technicians to be aware of certain unexpected situations during daily practice. A B
Fig(A) Axial PET/CT fusion images correspond to the right-sided myocardium (arrow).
Fig(B) Axial PET/CT images correspond to the left-sided liver (short arrow) ,showing the stomach (long arrow) in right side of the abdomen.