  We report the serendipitous discovery of a $8' \times 12'$ emission shell
brightest in [O III] centered on the X-ray binary B[e] star, CI Cameleopardalis
(CI Cam). This shell, detected during a survey of optical emission associated
with the Galactic supernova remnant G150.3+4.5, is seen outside but immediately
adjacent to the remnant's optical filaments along its northwestern edge.
Assuming this shell is related to CI Cam's strong winds and transient
outbursts, the adoption of CI Cam's Gaia DR3 statistically corrected distance
of 4.1$^{+0.3}_{-0.2}$ kpc yields shell dimensions $\simeq$ 9.5 pc $\times$
14.3 pc. While the distance to the G150.3+4.5 remnant is uncertain, the
appearance of CI Cam's emission shell so close to the SNR's optical filaments
appears likely to be a chance coincidence.
