1818
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Diffuse infiltration by acute lymphoblastic leukemia (T-ALL, infiltration volume 80%).
Bone Marrow
Haematoxylin & Eosin (H&E)
15 years
male
Normocelluar bone marrow (80-90%) showing diffuse infiltration of small lymphoid cells. However, if one pays attention to cytological details, the lymphoid cells exhibit blastoid morphology with an open chromatin, which is not compatible with a mature lymphoma diagnosis.
Philippe Brunner, University of Basel
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