PMC6187009_01
MRI pelvis of fibromatosis of right gluteal region.. Coronal plane showing mass infiltrating in the adjacent gluteus muscles and entering in pelvis.. Axial plane showing no lymphadenopathy and normal vessels.
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No significant pelvic lymphadenopathy noted and the visualized vessels showed normal flow voids (Fig. 1a & b).
Pre-operative (incisional) biopsy.. [A] Low power view of the lesion exhibiting fascicles of spindle cells against fibrotic background. (H&E stain; 100x magnification) [B] High power view of spindle cells with bland, elongated and vesicular nuclei. (H&E stain; 400x magnification) [C] Spindle cells showing patchy expression for alpha smooth muscle actin and [D] patchy nuclear expression for beta-Catenin IHC stains. (400x magnification).
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Figs. 2 & 3 shows pre-operative (incisional) biopsy and post-operative excisional biopsy respectively.