Pericentric inversion 9
46,XY,inv(9)(p11q13)
Also known as: inv(9), inversion 9 variant
46,XY,inv(9)(p11q13) is a pericentric inversion of chromosome 9. It is one of the most common structural variants in the human genome and is generally considered a benign finding.
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What the notation means
46count,XYsex chromosomes,inv(9)(p11q13)abnormality
The shape of this abnormality
invsymbol(9)chromosomes(p11q13)breakpoints
- (9)
- one chromosome, so one group of breakpoints follows.
- (p11q13)
- one band in each arm: the flipped segment spans the centromere (pericentric).
- count · sex chromosomes
- a normal count and the usual male sex chromosomes
- abnormality
- an INVERSION in chromosome 9: the segment between 9p11 and 9q13 is flipped end-for-end (pericentric, it spans the centromere)