How likely is the fluid in and around my ankle joint, found via a CT scan, an infection like septic joint?

Depends. Fluid around the ankle joint is probably caused by trauma to the joint. A septic joint will be red, swollen, hot to touch, very painful, and possibly accompanied by a fever.
Ct vs MRI . Ct will will give good results but an MRI is the gold standard.

Related Questions

Hi, I recently found out I have increased fluid in and around my ankle joint. Is it possible to be an infection like septic joint?

Joint effusion. It may be infectious or noninfectious. An arthrocentesis should be performed and the aspirated fluid analyzed. Read more...
Less likely. Fluid can be due to an infection but otherwise healthy individuals don't typically develop a septic joint. More common causes include arthritis, inflammation, etc. Read more...
Fluid. Fluid in the ankle could mean many different things, infection, gout, arthritis, etc. Italy be prudent to have your ankle checked out and possibly have the fluid collected through a needle to send out for specimen. I hope this helps! Read more...
Fluid. All joints have some fluid in them but if painful it could be due to a number of things. Infection is possible but without a portal of entry it's more likely from arthritis . Get aspiration have it tested. Read more...