title: PVNS or pseudo aneurysm: MRI-problem solving or misleading?
abstract: 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.
authors.affiliation: Department of Radiology, Shri Harilal Bhagwati Municipal Corporation Hospital, Mumbai, India.
authors.forename: Bhagya
authors.initials: B
authors.lastname: Sannananja
authors.affiliation: Department of Radiology, Shri Harilal Bhagwati Municipal Corporation Hospital, Mumbai, India.
authors.forename: Hardik Uresh
authors.initials: HU
authors.lastname: Shah
authors.affiliation: Department of Radiology, Bharatratna Dr. Babasaheb Ambedkar Hospital, Mumbai, India.
authors.forename: Varun
authors.initials: V
authors.lastname: Laxman
authors.affiliation: Department of Radiology, Shri Harilal Bhagwati Municipal Corporation Hospital, Mumbai, India.
authors.forename: Chinmay
authors.initials: C
authors.lastname: Nagesh
keywords: Dislocation; magnetic resonance imaging; pigmented villonodular synovitis; pseudoaneurysm