we describe the imaging features of a metastatic superscan on gallium-68 glu - nh - co - nh - lys-(ahx)-[ga-68(hbed - cc ) ] , abbreviated as gallium-68-prostate - specific membrane antigen ( 68ga - psma ) positron emission tomography / computed tomography ( pet / ct ) imaging . 
 68ga - psma is novel radiotracer undergoing evaluation for pet / ct imaging of prostate carcinoma . 
 this patient had a superscan of metastases on conventional bone scintigraphy and was referred for 68ga - psma pet / ct to evaluate the feasibility of 177lu - psma therapy .