Prostatic Utricle Cysts as a Potential Pitfall in PSMA PET/CT Interpretation.

ABSTRACT

ABSTRACT A 60-year-old man with T2aN0M0 prostate cancer underwent intensity-modulated radiotherapy targeting the prostate and seminal vesicles. Experiencing biochemical recurrence after 6 years, 68 Ga-PSMA-11 PET/CT revealed focal radioactivity in the posterior midline of the prostate, identified as a prostatic utricle cyst on subsequent MRI. Similar findings appeared in a previous 18 F-piflufolastat PET/CT, with negative biopsy results. The patient then received intensity-modulated radiotherapy directed to 2 PSMA-avid pelvic nodes and leuprolide acetate, achieving an undetectable PSA in 4 months. This case highlights a potential pitfall in PSMA PET interpretation associated with prostatic utricle cysts.