Computed tomography and magnetic resonance imaging findings of metastatic rectal linitis plastica from prostate cancer: A case report and review of literature

Figure 1 Sigmoidoscopic imaging showing narrowing of the rectal lumen with normal overlying mucosa.

Figure 2 Contrast-enhanced computed tomography and pelvic magnetic resonance imaging of secondary rectal linitis plastica from prostate cancer. A: Contrast-enhanced CT shows circumferential rectal wall thickening with marked enhancement and minimal perirectal fat stranding; B: T2-weighted images; C: Diffusion-weighted images. On T2-weighted images and diffusion-weighted images, a target sign is present; D: Apparent diffusion coefficient map, the prostate shows infiltrative lesions with low ADC values, compatible with prostatic adenocarcinoma.

Figure 3 Histological images of metastatic prostate adenocarcinoma obtained from transanal full-thickness excisional biopsy. A: Hematoxylin and eosin (HE) staining showed a moderate to poorly differentiated adenocarcinoma characterized by tumor cells diffusely infiltrated into submucosa and muscularis propria, sparing the mucosal layer (original magnification ×100); B: Immunohistochemical stains were performed and the tumor cells were positive for prostate specific antigen (PSA, original magnification ×100).