ContourPlot3D[(x^2)+(y^2)-(z^2),{x,-2,2},{y,-2,2},{z,-3.2,3.2},Contours->{-4,-1,0,1,4},Mesh->False,RegionFunction->Function[{x,y,z},x^2+y^2≤3.8],BoxRatios->Automatic,ContourStyle->{Opacity[0.2]},BoundaryStyle->{Yellow,Thick},PlotPoints->50,Boxed->False]

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