Intracranial Hemorrhage Shows Different Timing Patterns in Pediatric Acute Leukemia

A retrospective study published in Pediatric Blood & Cancer examined intracranial hemorrhage (ICH) in 340 children with newly diagnosed acute leukemia. Investigators compared clinical characteristics and overall survival between patients with and without ICH and assessed neuroimaging and neurological outcomes in affected children. Early-onset ICH was defined as hemorrhage within seven days after leukemia diagnosis; late-onset ICH occurred thereafter.

Eleven children (3.2%) developed ICH. They were significantly younger and more frequently had KMT2A rearrangements, hyperleukocytosis, thrombocytopenia, and coagulation abnormalities than children without ICH. Five-year overall survival was 55.4% versus 90.4%, respectively (p < 0.001). Early-onset ICH predominantly affected patients with acute myeloid leukemia and featured multifocal hemorrhages at presentation. Late-onset ICH occurred exclusively in acute lymphoblastic leukemia (ALL). Three infants with KMT2A-rearranged B-cell ALL developed marked cerebral atrophy followed by subdural hematoma. Five patients required neurosurgical intervention, and all survivors with ICH had persistent neurological sequelae.

These findings suggest that hemorrhage timing may help clinicians recognize different presentations and guide neuroimaging evaluation and neurosurgical assessment. However, the retrospective design and only 11 ICH cases limit conclusions about risk prediction and causality. The abstract does not establish whether earlier imaging or intervention improves outcomes; full text was unavailable for review.