t-cell acute lymphoblastic leukemia with del (7) (q11.2q22) and aberrant expression of myeloid markers.

t cell acute lymphoblastic leukemia (all) is an invasive disease with a higher incidence in children and adolescents. in terms of immunophenotype, t-all is positive for cd2, cd7, cd34 and hla-dr, and the level of these markers is increased with increasing age. in addition, the myeloid markers (cd13, cd33) are sometimes expressed in t-all. in this study, we introduce a rare case of a 28-year-old woman with t-all with aberrant expression of myeloid markers (cd13), without lymphadenopathy and with 94% blasts in bone marrow specimens. the patient has the rare karyotype of 46,xx del(7)(q11.2q22). the presence of del7 is a rare phenomenon in t-all.