Left panel: VST image of FCSS J033710.0-354727 in g band and the isophote contours (green lines). Labels indicate the center of the galaxy, X, the two bright knots inside the polar structure, Y and Z, and several bright features, from A to G, which are apparently distributed on an elliptical orbit (blue dashed line) around the polar direction. Right panel: high-frequency residual images of FCSS J033710.0-354727 in the g band (see Sect. 3 for details). North is up and east is on the left.