  We investigate medium modifications of the pentaquark $\Theta^+$ in dense
medium, taking into account different parities of the exotic $\Theta^+$ baryon.
We find that the chemical potential of the $\Theta^+$ is shifted in a
density-dependent way to one-loop order. We also investigated the effect of the
scaled nucleon mass in dense medium on the $\Theta^+$ propagator. The results
turn out to depend sensitively on the scaled nucleon mass and on the parity of
the $\Theta^+$.
