# Positron emission tomography scan

Positron emission tomography scan

In prostate cancer gallium-labelled prostate-specific membrane antigen (PSMA) has been increasingly used in positron emission tomography (PET) scans. It is sensitive in detecting lymph node metastasis and may be superior to MRI; however, smaller lymph nodes can be missed on PSMA-PET . If avail able, this test o ff ers an additional and highly sensitive modality for detecting metastasis prior to o ff ering treatment. It also has an increasing role in restaging after treatment r elapse. 

Figure 84.20
Bone scan showing multiple hot spots suggestive of
metastatic disease in a man with prostate cancer.