Figure 1: Images of a 43-year-old male with SFT of the prostate. Axial (a) T1-weighted and (b) T2-weighted MRI showing the tumor (red arrows) in the region of the prostatic gland anterior to the rectum and posterior to the bladder without necrosis. Fat tissue between the tumor and neighboring organs was not invaded. The tumor was isointense on T1 sequence and heterogeneous hyperintense on T2 sequence; (c) sagittal T2-weighted MRI indicating the tumor (red arrow) arising from the posterosuperior of the prostate basis (white arrow), with a distinct margin between the posterior wall of the bladder and the anterior wall of the rectum. The seminal vesicle and pelvic lymph nodes were not invaded; (d) hematoxylin–eosin staining showing proliferative oval/spindle-shaped neoplastic cells arranged in a storiform pattern with alternating hyper- and hypocellular areas intermixed with sclerotic collagenous matrix (×10, scale bar = 200 μm); (e) immunodetection showing strong diffuse tumor cell staining for CD34 (×20, scale bar = 100 μm). (f) Axial and (g) sagittal T2-weighted MRI showing the recurrent SFT (red arrows) in the pelvic cavity anterior to the first sacral vertebrae level. The tumor was heterogeneously hyperintense on T2 sequence; (h) diffusion-weighted MRI showing the distinctly heterogeneous hyperintense tumor with an irregular lobule margin (red arrow); (i) hematoxylin–eosin staining showing higher density of oval/spindle tumor cells with more distinctly atypical hyperplasia and mitotic activity (×20, scale bar = 100 μm). SFT: solitary fibrous tumor; MRI: magnetic resonance imaging.