What causes Pericentric inversions?
Pericentric inversions result from a two-break event in which there is a break in each arm including the centromere.  An inversion does not usually have phenotypic effect in the majority of pericentric inversion heterozygote carriers, when it is a balanced rearrangement.
How are Paracentric and pericentric inversion difference?
Inversions are of two types: paracentric and pericentric. Paracentric inversions do not include the centromere, and both breaks occur in one arm of the chromosome. Pericentric inversions include the centromere, and there is a break point in each arm.