Ring chromosome 13
46,XY,r(13)(p11q34)
Also known as: r(13), ring 13
46,XY,r(13)(p11q34) is a ring chromosome 13, formed when both arms of chromosome 13 break and the broken ends fuse into a circle. Ring chromosomes are unstable through cell division.
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What the notation means
46- total chromosome count (the normal human number)
XY- sex chromosomes: one X, one Y (usual male karyotype)
r(13)(p11q34)- a RING chromosome r(13): the chromosome's arms break and the broken ends fuse into a circle (usually loses the distal tips)