PMC5768252_01
MRI images: (a) coronal T1-weighted image (TR = 680.0 TE = 20.0), (b) sagittal T1-weighted image (TR = 520.0 TE = 20.0). A heterogeneous mass, almost isointense to muscle, with a central marked hypointense area (white arrow) is shown. (c) Coronal STIR image (TR = 1780.0 and TE = 25.0), (d) axial T2 images (TR = 4340.0 TE = 100.0) conducted at three different levels. A heterogeneous hyperintense lesion with an internal low-signal septation, compatible with intralesional calcification (black arrows) is shown.
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T1-weighted sequences depicted a heterogeneous mass, almost isointense to muscle, with a central marked hypointense area (Figure 1(a) and (b)). Short T1 inversion recovery (STIR) and T2 images showed a heterogeneous marked hyperintense nodule, without intralesional fat (Figure 1(c) and (d)). Coronal STIR images (Figure 1(c)) revealed a hyperintense lesion with an internal low-signal septation, compatible with intralesional calcification.
(a) H&E 20x: the section shows a nodular, pseudoencapsulated lesion composed of papillary formations with hyaline or fibrous bundles and (b and c) H&E 100x, H&E 500x: at high magnification, it is possible to observe some vascular formations, with a labyrinthic structure, lined by plump endothelial cells. The underlying fibrous stroma appears oedematous; necrosis, cellular atypias, or atypical mitotic cannot be detected.
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Microscopic examination showed an intravascular single layer endothelial proliferation with a papillary architecture, in absence of cytologic atypia (Figure 2(a)-(c)).