PMC7533099_01
Selected computed tomography images of the spine. Axial (a) and sagittal (b) views demonstrate the left paraspinal soft-tissue mass (*) with an area of calcification that is extended from the level of T12/L1 down to the L4 level vertebra. Note the bone erosion changes in the lamina at the axial plane and the extension into the L1/L2 left neural foramina (arrows).
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F1
T12-L1 level to the L4 vertebral level [Figures 1 and 2].
Selected magnetic resonance images of the lumbosacral spine. Axial T1- and T2-weighted images at the L1/L2 level in the left neural foramina (a and b) demonstrate the left paraspinal soft- tissue mass causing erosion of the left side lamina and the spinous process of the L2 vertebra with extension through the neural foramina. No involvement of the cauda equina terminal nerve roots is noted. Axial and Sagittal T1 FS-weighted images (c and d) at the same level demonstrate soft-tissue mass enhancement.
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F2
T12-L1 level to the L4 vertebral level [Figures 1 and 2].
Histopathological description. Malignant spindle cell proliferation, forming sheets of cells with a prominent staghorn (hemangiopericytoma) vascular pattern (a). The cells display plump spindles to ovoid monomorphic nuclei with open chromatin. Mitotic figures are noted (b). Tumor cells are diffusely positive for TLE 1 (c). CD34 and smooth muscle actin highlight the prominent vascular network (d).
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F3
Microscopic examination revealed malignant spindle cell proliferation forming sheets of cells with a prominent staghorn (hemangiopericytoma) vascular pattern [Figure 3].