Locked hip joint: an uncommon presentation of localized pigmented villonodular synovitis

We report a 24-year-old male who was admitted to the emergency department with an unusual com- plaint of locked hip joint. Magnetic resonance imaging (MRI) showed a 3-cm intra-articular synovial nodular mass and a 3.0x2.4x1.6-cm yellow-brownish colored pediculed synovial nodular mass was excised with hip arthroscopy. Pathological examination confirmed the diagnosis of pigmented villon- odular synovitis. Excision of the mass allowed prompt resolution of the symptoms and there was no sign of recurrence at 3-year follow-up.

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