Diffuse infiltration of bone marrow by tumor cells.
D001707:Biopsy, Needle; D001853:Bone Marrow / Q000473:pathology*; D001859:Bone Neoplasms / Q000175:diagnosis / Q000473:pathology*; D002648:Child; D002675:Child, Preschool; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007938:Leukemia / Q000175:diagnosis; D008297:Male; D009362:Neoplasm Metastasis; D009447:Neuroblastoma / Q000175:diagnosis / Q000473:pathology*; D012175:Retinoblastoma / Q000175:diagnosis / Q000473:pathology*