  We present structural studies of V$_{1-x}$Cr$_x$O$_2$ (pure, 0.7% and 2.5% Cr
doped) compounds at room temperature in a diamond anvil cell for pressures up
to 20 GPa using synchrotron x-ray powder diffraction. All the samples studied
show a persistence of the monoclinic $M_1$ symmetry between 4 and 12 GPa. Above
12 GPa, the monoclinic $M_1$ symmetry changes to isostructural $M_x$ phase
(space group $P2_1/c$) with a significant anisotropy in lattice compression of
the $b$-$c$ plane of the $M_{1}$ phase. This behavior can be reconciled
invoking the pressure induced charge-delocalization.
