N1 Single lymph node metastasis, 2 cm or less in greatest dimension N1 Single regional lymph node metastasis in the true pelvis (hypogastric, obturator, external iliac or presacral lymph node) N2 ...

Effect of C7-T1 Extensional Posterior Transpedicle Osteotomy on Mobility and Quality of Life in Patients with Ankylosing Spondylitis Complicated with Lumbar Kyphosis and Related Factors.