👉 Sarcocollaendrochondroma, also known as a saccocollaendrochordoma or a saccocollonendrochordoma is a rare type of bone tumor that develops within the bone itself. It is characterized by the presence of abnormal cells in the bone and can occur anywhere in the body, but it is most commonly seen in the spine, especially the vertebrae. The tumor can grow rapidly and may cause pain or discomfort when touched,