68Ga-PSMA-11 PET/CT and PET/MRI in Rectal Linitis Plastica Secondary to Prostate Adenocarcinoma

Primary or secondary rectal linitis plastica is rare. We describe MRI, Ga-68-PSMA-11 PET/CT, and PET/MRI findings in a case of rectal linitis plastica secondary to prostate adenocarcinoma. In this case, the rectal linitis plastica was the first manifestation of the prostatic adenocarcinoma, and the rectum was the only metastatic site of the prostate adenocarcinoma. The rectal wall showed circumferential thickening with a concentric ring pattern on MRI, and diffuse intense Ga-68-PSMA-11 uptake on PET/CT and PET/MRI. Familiarity with the imaging findings of rectal linitis plastica secondary to prostate adenocarcinoma may be helpful for recognition of this rare entity.