[A contribution to pigmented villonodular synovitis of the shoulder joint (author's transl)].

Pigmented villonodular synovitis of the shoulder joint, particularly with osseous invasion, is a rare disease. Typical clinical, roentgenological and histological criteria are pointed out on the basis of the case report of one of the authors' own patients. Aetiology and pathogenesis of the changes are discussed. This disease must be included in differential diagnostic deliberations in the shoulder joint region as well, where it may be superficially confused with malignant tumours of the joint.