After treatment of acute leukemia (typically ALL and the monocytic var
iants of AML), relapse may occur at sites other than the marrow, Isola
ted extramedullary relapse of acute promyelocytic leukemia (APL) howev
er, is rare, We describe such an event in a man who underwent allogene
ic BMT for APL in second relapse and 4 years later presented with test
icular relapse, The marrow was morphologically and cytogenetically nor
mal, but RT-PCR analysis revealed the specific PML/RAR chimeric RNA tr
anscript.