Pigmented Villonodular Synovitis of the Elbow: A Case Report and Sonographic Findings

Sonographic pictures of the PVNS in the left elbow. (A) Longitudinal view on the olecranon, a hyperechoic, heterogenous, irregularly-shaped mass was noted at the olecranon fossa, below the triceps tendon, extending to the posterior-medial aspect; (B) transverse and longitudinal view under power-mode Doppler showed increased perfusion of the irregular mass.

Sagittal MR images. (A) A fast spin-echo T2-weighted MR image showed a low-signal-intensity mass with mild adjacent cortical erosion of the dorsum aspect of the distal humerus; (B) a T1-weighted MR image showed a low-signal-intensity mass. MR=magnetic resonance.

Transverse axial T1-weighted image gadolinium-enhanced MR image. (A) Significant contrast enhancement corresponding to soft-tissue lesions and thickened synovium; (B) a region of irregular area with less prominent enhancement is related to an area with more concentrated hemosiderin deposition (arrow). MR=magnetic resonance.