Parachordoma: A Rare Sarcoma with Clonal Chromosomal Changes

This is the first report on clonal chromosomal aberrations in a metastatic parachordoma lesion. All neoplastic cells had the karyotype 33–47,X,der(X)t(X;3)(p11;p11),der(3)t(3;6)(p11;q13), del(6)(q13),−9,−13,r(13),+mar. The presence of t(X;3) with a breakpoint at band Xp11 as in synovial sarcoma may suggest a common histological origin of the two tumor types.