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We show that signed weak solutions to obstacle problems for porous mediumtype equations with Cauchy-Dirichlet boundary data are continuous up to theparabolic boundary, provided that the obstacle and boundary data arecontinuous. This result seems to be new even for signed solutions to the(obstacle free) Cauchy-Dirichlet problem to the singular porous mediumequation, which is retrieved as a special case.

Continuity up to the boundary for obstacle problems to porous medium type equations