which way? off of, off a, or of? help?

Pulmonary nodule appears to have resolved, slightly ectatic ascending aorta off a 4.8 cm

Pulmonary nodule appears to have resolved, slightly ectatic ascending aorta off of 4.8 cm

Pulmonary nodule appears to have resolved, slightly ectatic ascending aorta of 4.8 cm

• which way? off of, off a, or of? help? - wondering
  • "OF" - travelinMT
  • I would assume "of" is what goes here. - vn
    • Thanks to both - Pammie

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