Fig. 4
From: Fifth lumbar vertebrae solitary osteochondroma arising from the neural arch, a case report
surgical excision of the lesion, a: intraoperative picture showing a lumbar spine posterior midline approach exposing the tumor in situ in contiguous to the spinous process of L5 causing adjacent left paraspinal muscular compression (black arrowhead), b the lesion cancellous bony bed after excision (blue arrowhead), c the resected mass showing the cartilaginous cap (white asterisk) and the bony stalk (red asterisk)