PMC3290003_01
Imaging of prostatic SFT. Pelvic axial CT-scan (a) detecting a medial massive mass lesion in pelvic and hypogastric regions. Axial (b) and sagittal (c) T2-weighted magnetic resonance image showing an inhomogeneous mass lesion with necrotic areas (stars), arising from prostatic basis (black arrow), with a distinct margin between the mass as well as between the posterior wall of the bladder and the anterior wall of the rectum (white arrows). Sagittal T1-weighted injected magnetic resonance image (d) shows an inhomogeneous and highly contrast-enhanced mass.
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F1
Otherwise, MRI showed fat interface between the mass, the posterior bladder wall and the anterior rectal wall without any sign of involvement (fig. 1).
Prostatic SFT: histological aspects. a Low-power view of a highly cellular area with characteristic 'staghorn' vessels (black arrows) (HE staining, original magnification x40). b An area of lower cellularity: cells are mixed with collagen bundles (HE, original magnification x200). c High-power view showing oval to fusiform cells with scant atypias (HE, original magnification x400). d Tumor cells strongly express CD34 (CD34 immunodetection, original magnification x100).
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F2
Microscopical analysis (fig. 2) showed a well-encapsulated lesion composed of spindle cells arranged without any particular architecture (so-called 'patternless pattern'), associated with variable amounts of collagen and a distinctive vascularization ('staghorn' vessels).