A rare case of Primary Leptomeningeal Precursor B cell Lymphoblastic Lymphoma in a Pediatric Patient – Case report and Literature review

We present a 4 year obese child, with no mass lesion in brain/CNS, normal chest, abdomen & normal peripheral smear, Bone marrow aspirate.There was Subdural Collection and enhancement.CSF cytology showed lymphoma/leukemic infiltration, Immunophenotyping was Precursor B cell lymphoma involving meninges.FISH study showed abnormal signal pattern for BCR-ABL gene indicating trisomy 9.