title: Mixed Phenotypic Acute Leukemia Presenting as Mediastinal Mass-2 Cases.
abstract: Mixed phenotype acute leukemia symbolizes a very small subset of acute leukemia that simply cannot be allocated as lymphoid or myeloid lineage. The 2008 World Health Organisation classification established stringent standard for diagnosis of mixed phenotype acute leukemia, accentuating myeloperoxidase for myeloid lineage, cytoplasmic CD3 for T lineage and CD19 with other B markers for B lineage obligation. Mixed phenotype leukemia is rare and 3-5 % of acute leukmias of all age groups, is associated with poor outcome with overall survival of 18 months. We wish to present two cases of mixed phenotypic acute leukemia who presented with mediastinal masses, were suspected to be T cell lymphoma/leukemia clinically and radiologically. In one case, tissue diagnosis was given as lymphoma for which treatment was given. These cases show that patients diagnosed as lymphoma on histopathology can be cases of mixed phenotype acute leukemia and varying specific treatment protocols and follow up are required. Awareness of these entities will help in proper diagnosis and treatment.
authors.affiliation: Department of Pathology, Army Hospital (Referral & Research), Delhi, India.
authors.forename: Rig
authors.initials: R
authors.lastname: Vardhan
authors.affiliation: Department of Pathology, Army Hospital (Referral & Research), Delhi, India.
authors.forename: Jyoti
authors.initials: J
authors.lastname: Kotwal
authors.affiliation: Department of Pathology, Army Hospital (Referral & Research), Delhi, India.
authors.forename: Prosenjit
authors.initials: P
authors.lastname: Ganguli
authors.affiliation: Department of Pathology, Army Hospital (Referral & Research), Delhi, India.
authors.forename: Rehan
authors.initials: R
authors.lastname: Ahmed
authors.affiliation: Department of Hematology, Army Hospital (Research & Referral), Delhi, India.
authors.forename: Ajay
authors.initials: A
authors.lastname: Sharma
authors.affiliation: Department of Hematology, Army Hospital (Research & Referral), Delhi, India.
authors.forename: Jasjit
authors.initials: J
authors.lastname: Singh