PMC6087572_01
(a) T1 coronal magnetic resonance image showing nodular intra-articular mass with low signal intensity (arrow). (b) T2 fat-saturated coronal magnetic resonance image showing nodular intra-articular mass with high signal intensity (arrow).
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Advanced imaging with a magnetic resonance arthrogram was available for review at the initial visit and demonstrated a pedunculated intra-articular mass in the superolateral aspect of the joint, near the femoral head-neck junction (Figure 1).
Gross specimen of the resected tumor.
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A nodular mass was encountered at the anterior and anterolateral femoral head-neck junction (Video 1) and excised (Figure 2).
(a) Low power histopathology view demonstrating one of the circumscribed nodules that comprised the multinodular tumor. Fibroblastic cells are spindled to stellate with variable cellularity set in a collagenous stroma. Slit-like capillaries can be seen as well (center to left). The right side of the image is the surface of the nodule (magnification 10x). (b) Tumor nodules had variable cellularity with hypocellular hyalinized appearing areas (top and left) alternating with regions with higher cellularity (right) (magnification 10x).
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Pathological examination of the mass was remarkable for a multinodular proliferation of benign fibroblasts with variable cellularity including hyalinized hypocellular areas (Figures 3(a) and 3(b)). The vascular consisted of small capillaries along with elongated slit-like vessels (Figure 3(a)).