DOI: 10.36347/sjmcr.2018.v06i05.021

Pages: 362-364

This clinical case reports the story of a 54-year-old patient with extra-articular villonodular synovitis (SVN) of the knee, whose standard radiography and MRI showed extensive tissue injury in the posterior soft tissues of the right knee without bone involvement. The patient subsequently benefited from surgical excision of his lesion. Villonodular synovitis is a rare benign joint disease of unknown pathogenesis affecting tendon sheaths and synovial pouches. Its management remains complicated because of the lack of specificity of the symptomatology, delaying the diagnosis, and the very high rate of recidivism. Visualization of the lesions is done by MRI but the definitive diagnosis can only be made after ana¬tomopathological analysis of the surgical piece. The reference treatment is based on synovectomy, especially when the progression has not reached the stage of irreversible osteocartilaginous lesions. It can be performed under arthroscopy or after arthrotomy.