Trade encourages specialisation, which brings prosperity; global capital markets, for all their problems, allocate money more efficiently than local ones; economic co-operation encourages confidence and enhances security. Yet despite its obvious benefits, the globalised economy is under threat.
RA (the most common disease cause) and Paget disease of the cervical spine can cause atlantoaxial dislocation or subluxation, basilar invagination, or platybasia. Metastatic tumors that affect bone can cause atlantoaxial dislocation or subluxation.
Overlying bowel gas, overlying lung base or rib shadows can cause problems. Slowly roll the patient, to improve visualistaion. Try inspiration,expiration,distended abdomen,erect. Rarely the left lobe of the liver (if enlarged) may be used as a window to assess to superoanterior portion of the spleen.