PVNS or pseudo aneurysm: MRI-problem solving or misleading?

• Main Authors: Bhagya Sannananja, Hardik Uresh Shah, Varun Laxman, Chinmay Nagesh
• Format: Article
• Language: English
• Published: Thieme Medical and Scientific Publishers Pvt. Ltd. 2015-01-01
• Series: Indian Journal of Radiology and Imaging
• Subjects: dislocation; magnetic resonance imaging; pigmented villonodular synovitis; pseudoaneurysm
• Online Access: http://www.thieme-connect.de/DOI/DOI?10.4103/0971-3026.150152

Pigmented villonodular synovitis (PVNS) is a benign neoplastic process affecting the synovium.Magnetic resonance imaging (MRI) is considered as the imaging modality of choice, where PVNS is seen as a soft tissue lesion affecting the synovium with characteristic hypointense signal on T2-weighted images (T2WI) and typically blooming on gradient echo (GRE) sequences. MRI can sometimes be misleading, with many non-neoplastic pathologies having a tendency of recurrent bleeding closely mimicking PVNS. We report a case  of pseudoaneurysm from posterior circumflex humeral artery, a branch of axillary artery, secondary to recurrent shoulder dislocation mimicking PVNS on MRI.