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.

Keywords: CSF cytology; obese child; Immunophenotyping, B cell lymphoma.

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Dr Ashwini Nargund

Associate Professor, Department of Pathology, Dr M H Marigowda road, Kidwai Cancer Institute, Bengaluru, India