| RPO | Right Posterior Oblique view |
|---|---|
| ALAO | angiographic area of left anterior oblique projection |
| AO | abdominal aorta; achievement orientation; acid output; acridine orange; ankle orthosis; anodal openi... |
| ARAO | angiographic area of right anterior oblique projection |
| IO | incisal opening; inferior oblique; inferior olive; internal os; interorbital; intestinal obstruction... |