Multiparametric-MRI in diagnosis of prostate cancer

Sangeet Ghai, Masoom A Haider, Sangeet Ghai, Masoom A Haider

Abstract

Multiparametric-magnetic resonance imaging (mp-MRI) has shown promising results in diagnosis, localization, risk stratification and staging of clinically significant prostate cancer. It has also opened up opportunities for focal treatment of prostate cancer. Combinations of T2-weighted imaging, diffusion imaging, perfusion (dynamic contrast-enhanced imaging) and spectroscopic imaging have been used in mp-MRI assessment of prostate cancer, but T2 morphologic assessment and functional assessment by diffusion imaging remains the mainstay for prostate cancer diagnosis on mp-MRI. Because assessment on mp-MRI can be subjective, use of the newly developed standardized reporting Prostate Imaging and Reporting Archiving Data System scoring system and education of specialist radiologists are essential for accurate interpretation. This review focuses on the present status of mp-MRI in prostate cancer and its evolving role in the management of prostate cancer.

Keywords: Diffusion imaging; MRI-guided biopsy; functional imaging; multiparametric-MRI; prostate cancer.

Conflict of interest statement

Conflict of Interest: None declared.

Figures

Figure 1
Figure 1
A 55-year-old man with Gleason 7 (4 + 3) prostate cancer. (a) Axial T2-weighted image (T2WI) shows the normal hyperintense T2 signal in the peripheral zone (white arrow) from the high water content with cancer (black arrow) appearing as an area of low signal on T2WI. (b) Apparent diffusion coefficient map at the same level showing low signal from the restricted diffusion at the site of cancer (arrow)
Figure 2
Figure 2
Transition zone tumor. A 54-year-old male with biopsy-confirmed Gleason 8 prostate carcinoma. The T2-weighted image showing a typical “erased charcoal” (arrow) appearance in the transition zone
Figure 3
Figure 3
Extracapsular extension of tumor. A 64-year-old male with biopsy-confirmed Gleason 7 (3 + 4) prostate carcinoma. Axial T2-weighted image obtained with the endorectal coil shows the low signal tumor in the left peripheral zone with minimal extension along the left neurovascular bundle (arrow)
Figure 4
Figure 4
Residual tumor following focal therapy. Dynamic contrast-enhanced axial subtraction image 6 months following focal therapy shows a nodular area of enhancement at the margin of the treatment. Magnetic resonance-directed fusion biopsy of the area was performed, which revealed Gleason 6 disease

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