based on 8 personal cases and a 81-cases review of literature , it 's authors ' opinion that cystic or solid masses issued form posterior lumbar articular process and called according to the cases synovial cyst , ganglion cyst , benign synovialoma , pigmented villonodular synovitis , are a single variety of benign degeneration of soft articular tissues .
C0039106
pigmented villonodular synovitis
C0225317
soft