Physiological 68Ga-PSMA-11 Uptake in Dural Venous Sinuses

Area of Science:

• Nuclear Medicine
• Radiology
• Oncology

Background:

• Prostate-specific membrane antigen (PSMA) PET/CT is a key imaging modality for prostate cancer.
• Dural sinus uptake of radiotracers can sometimes be challenging to interpret.

Purpose of the Study:

• To characterize previously unreported physiological uptake of 68Ga-PSMA-11 in the dural sinuses.
• To establish the relationship between dural sinus uptake and blood pool activity.
• To provide guidance for differentiating physiological from pathological uptake.

Main Methods:

• Retrospective analysis of patients undergoing 68Ga-PSMA-11 PET/CT for prostate cancer evaluation.
• Quantification of tracer uptake in dural sinuses and superior vena cava.
• Correlation analysis between SUVmax values.

Main Results:

• Hitherto unreported physiological low-grade 68Ga-PSMA-11 uptake was observed in the dural sinuses.
• A strong positive correlation was found between SUVmax in dural sinuses and SUVmax in the superior vena cava blood pool.
• This uptake is likely due to venous blood pool activity.

Conclusions:

• Low-grade 68Ga-PSMA-11 uptake in dural sinuses is physiological and related to blood pool activity.
• This finding should not be interpreted as pathological.
• Awareness of this physiological uptake is crucial for accurate PSMA PET/CT interpretation in prostate cancer staging and follow-up.