Absolute-intensity, small-angle X-ray scattering is used to investigate the pore structure of a carbon foam and its corresponding poly(acrylonitrile) foam precursor, both having a concentric band structure of unusually large spacing. The poly(acrylonitrile) foam was prepared from a solidified blend, containing crystallized maleic anhydride, by subliming the crystalline material. The scattering patterns for both foams reveal anisotropy in their pores and identical periodicity in the pore orientation as a function of distance along the radial direction. The period of pore-orientation oscillations, 3.5 mm, is the same as the period of macroscopically-visible bands present on the surface of both the carbon and poly(acrylonitrile) foams. Furthermore, the pore orientations in both samples show the same oscillatory orientation as the maleic anhydride crystals of the blend from which they were derived. The data suggest that a spherulitic orientation of the maleic anhydride crystals in the blend was imprinted on the polymer phase during crystallization.