  We investigate the medium modification of the generalized vector form factors
of the nucleon, which include the electromagnetic and energy-momentum tensor
form factors, based on an in-medium modified $\pi$-$\rho$-$\omega$ soliton
model. We find that the vector form factors of the nucleon in nuclear matter
fall off faster than those in free space, which implies that the charge radii
of the nucleon become larger in nuclear medium than in free space. We also
compute the corresponding transverse charge densities of the nucleon in nuclear
matter, which clearly reveal the increasing of the nucleon size in nuclear
medium.
