RT Journal Article SR Electronic T1 Leukaemic mantle cell lymphoma with t(11;14) and trisomy 12 showing clinical features of state A0 B cell chronic lymphocytic leukaemia JF Clinical Molecular Pathology JO Clin Mol Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP M165 OP M166 DO 10.1136/mp.48.3.M165 VO 48 IS 3 A1 J R Neilson A1 M Cai A1 N Bienz A1 M J Leyland YR 1995 UL http://mp.bmj.com/content/48/3/M165.abstract AB The precise diagnosis of lymphoma usually requires the histological examination of lymph nodes or involved tissues. Mantle cell lymphoma is a form of intermediate grade non-Hodgkin's lymphoma in which typical morphological immunophenotypic and cytogenetic features have been recognised. A case of leukaemic mantle cell lymphoma with the characteristic reciprocal translocation t(11;14) together with trisomy 12, a chromosomal abnormality usually associated with B cell chronic lymphocytic leukaemia (CLL), is presented. This combination of cytogenetic abnormalities has not been reported previously. The lack of lymphadenopathy and hepatosplenomegaly in this patient is more in keeping with stage A0 CLL. This case demonstrates the close clinical and biological relationship between mantle cell lymphoma and CLL.