  Wormholes (WH) require negative energy, and therefore an exotic matter
source. Since Casimir energy is negative, it has been speculated as a good
candidate to source that objects a long time ago. However only very recently a
full solution for D = 4 has been found by Garattini [1], thus the Casimir
energy can be a source of traversable WHs. Soon later Alencar et al [2] have
shown, that this is not true in D = 3. In this paper, we show that Casimir
energy can be a source of the Morris-Thorne WH for all spacetime with D > 3.
Finally, we add the cosmological constant and find that for D = 3 Casimir WHs
are possible, however, the space must always being AdS. For D > 3, we show that
the cosmological constant invert the signal with increasing throat size.
