Paeds · haematology-oncology-and-transfusion

Pancytopenia and marrow infiltration

Also known as Pancytopenia · Marrow infiltration · Myelophthisis · Bone marrow failure · Leukoerythroblastic anaemia · Marrow replacement

Fellowship guide to pancytopenia and marrow infiltration in children. Covers the definition of a fall in all three blood lineages, the three pathogenetic mechanisms of reduced marrow production, marrow replacement by leukaemia, neuroblastoma, Langerhans cell histiocytosis and rhabdomyosarcoma, and peripheral consumption, the leucoerythroblastic blood film with nucleated red cells and teardrop poikilocytes that signals myelophthisis, the urgent diagnostic pathway from full blood count and film to bone marrow aspirate, trephine biopsy, flow cytometry, cytogenetics and molecular testing, the stabilisation of the unstable child with transfusion of irradiated leucodepleted red cells and platelets, the prevention of tumour lysis syndrome with hyperhydration and rasburicase, and the cause-specific definitive therapy for acute lymphoblastic and myeloid leukaemia, acquired and inherited marrow failure, Down syndrome transient myeloproliferative disorder, neuroblastoma, Langerhans cell histiocytosis and parvovirus B19 pure red cell aplasia.

high12 referencesUpdated 16 July 202631 min readVerification in progress

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RACP DWERACP DCEMRCPCH TheoryMRCPCH ClinicalABP General Pediatrics

Red flags

A pale, bruising, febrile child with hepatosplenomegaly or lymphadenopathy has marrow malignancy until the bone marrow proves otherwiseA leucoerythroblastic film with nucleated red cells and teardrop poikilocytes signals marrow infiltration, fibrosis or myelophthisis and demands urgent marrow examinationA high blast count with a white cell count over one hundred times ten to the nine per litre risks leukostasis in the brain and lungs and needs urgent cytoreductionA mediastinal mass with stridor, superior vena cava obstruction or respiratory distress is an anaesthetic catastrophe waiting to happen; avoid sedation before securing the airwaySevere acquired aplastic anaemia is defined by a neutrophil count under zero point five, platelets under twenty, and a corrected reticulocyte count under one percent, and carries a high early mortality without rapid treatmentA sudden fall in haemoglobin with a reticulocyte count near zero in a child with a chronic haemolysis is parvovirus B19 transient pure red cell aplasia until excluded

Life stages

neonateinfanttoddlerpreschoolschool-ageadolescentyoung-adult-transition

Care settings

outpatientwarded-acutepicuretrieval

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Defines pancytopenia as a reduction in all three blood cell lineages and separates reduced marrow production from peripheral consumption or sequestrationNames the common causes of marrow infiltration in a child: acute leukaemia, neuroblastoma, Langerhans cell histiocytosis, rhabdomyosarcoma and disseminated tuberculosisRecognises the red-flag pattern of a pale, bruising, febrile child with hepatosplenomegaly and lymphadenopathy as probable marrow malignancy needing urgent investigationExplains how marrow infiltration by blasts, tumour cells or fibrosis produces trilineage failure and a leucoerythroblastic film with nucleated red cells and teardrop poikilocytesCoordinates the urgent diagnostic pathway from full blood count and film through bone marrow aspirate, trephine biopsy, flow cytometry, cytogenetics and molecular testing to the named diagnosisDistinguishes acquired aplastic anaemia, inherited bone marrow failure syndromes, parvovirus B19 transient red cell aplasia, and Down syndrome transient myeloproliferative disorder from true leukaemiaPancytopenia is a reduction in haemoglobin, neutrophils under one point five times ten to the nine per litre, and platelets under one hundred and fifty times ten to the nine per litreAcute tumour lysis syndrome prevention for a high-risk marrow malignancy uses hyperhydration, allopurinol or rasburicase, and close biochemical monitoringFebrile neutropenia in a child on treatment for leukaemia is treated empirically with an antipseudomonal beta-lactam within one hourCounsels the family of a child newly diagnosed with acute leukaemia presenting as pancytopenia, explaining the diagnosis, the treatment phases and the prognosisBuilds the multidisciplinary plan that runs paediatric haematology-oncology, infectious diseases, the diagnostic laboratory, the family and the primary care team togetherSynthesises the long-case child with inherited bone marrow failure into a surveillance and transition plan covering malignancy risk, transfusion, iron overload and stem cell transplantLevel 1: Recognition of pancytopenia on a full blood count and identification of the red-flag features that mandate urgent referralLevel 2: Application of the bone marrow aspirate and trephine biopsy pathway with flow cytometry and cytogenetics to reach a named diagnosisLevel 3: Coordination of definitive therapy for marrow failure and malignancy, including transfusion support, transplant referral and long-term surveillanceThe definition of pancytopenia and the three pathogenetic mechanisms of reduced production, marrow replacement and peripheral consumptionThe leucoerythroblastic blood film and its association with marrow infiltration, fibrosis and myelophthisisThe causes of marrow failure in childhood including aplastic anaemia, Fanconi anaemia and parvovirus B19 transient red cell aplasiaStructured assessment of the pale, bruising child for pallor, petechiae, organomegaly, lymphadenopathy and signs of inherited marrow failureCommunication of a new diagnosis of acute leukaemia or marrow failure to a child and family with appropriate honesty and supportRecognition of the oncologic emergencies of hyperleukocytosis, tumour lysis syndrome and febrile neutropeniaPancytopenia in a child as a presentation that demands rapid separation of benign transient causes from marrow malignancy and failureThe diagnostic roles of the peripheral blood film, bone marrow aspirate, trephine biopsy, flow cytometry and cytogeneticsDown syndrome as a predisposition to transient myeloproliferative disorder and acute megakaryoblastic leukaemiaRecognition of the red-flag clinical and laboratory features of pancytopenia that mandate urgent referral to paediatric haematology-oncologyApplication of the initial stabilisation of a child with severe pancytopenia including transfusion and sepsis precautionCoordination of the diagnostic and multidisciplinary pathway for a child with marrow infiltration or failureCanadian approach to the urgent evaluation and referral of a child with newly identified pancytopeniaBone marrow aspirate and trephine biopsy with ancillary studies as the diagnostic standard for marrow infiltrationInherited bone marrow failure syndromes and their surveillance for clonal evolution and malignancy

Your progress

Saved locally on this device.

Practise this topic

Target exams

RACP DWERACP DCEMRCPCH TheoryMRCPCH ClinicalABP General Pediatrics

Red flags

Life stages

neonateinfanttoddlerpreschoolschool-ageadolescentyoung-adult-transition

Care settings

outpatientwarded-acutepicuretrieval

Clinical exam formats

written-only

Board mappings

Overview & Definition

A child is brought in pale, covered in bruises, with a fever, and the blood count shows that every cell line has fallen at once. This is pancytopenia, and the first job at the bedside is not to name the disease but to decide which of two very different things is happening to the bone marrow. Either the factory is empty and unable to make cells, or the factory is full but the cells inside it are the wrong ones. That single distinction, between an empty marrow and a full one, drives every decision that follows, from how fast the child must be worked up to whether the family is about to hear the word leukaemia. [1]

Pancytopenia is defined by a fall in all three circulating lineages below the age-appropriate reference range: the haemoglobin, the neutrophil count, and the platelet count. A practical working threshold is a neutrophil count under one point five times ten to the nine per litre and a platelet count under one hundred and fifty times ten to the nine per litre, alongside the anaemia. The word is a laboratory finding, never a diagnosis, and the value of recognising it quickly is that it forces the clinician away from thinking about each line in isolation and towards the marrow itself as the seat of the problem. [1]

Marrow infiltration, also called myelophthisis, is the specific mechanism in which the haematopoietic tissue of the bone marrow is crowded out and replaced by something else: malignant blasts, metastatic tumour cells, fibrous tissue, or a granulomatous process. The normal blood-forming cells are squeezed out, the marrow architecture is distorted, and immature cells leak into the blood. Acute leukaemia is the diagnosis every paediatrician fears when pancytopenia appears, because it is the commonest marrow malignancy of childhood and because a delay of days can change the outcome. [3]

The gravity of the finding is why the topic sits at the heart of the fellowship examination. A candidate who can look at a pale, bruising child, read the count and the film, decide whether the marrow is empty or full, and chart a safe path to diagnosis and stabilisation is demonstrating exactly the reasoning the boards test. The landmark evidence on childhood leukaemia, marrow failure and the oncologic emergencies frames every part of the pathway that follows. [3][12]

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References12Show ledger

[1]Bhatnagar SK, Chandra J, Narayan S Pancytopenia in children: etiological profile J Trop Pediatr, 2005.PMID 16014764
[2]Fragkandrea I, Nixon JA, Panagopoulou P Signs and symptoms of childhood cancer: a guide for early recognition Am Fam Physician, 2013.PMID 23939697
[3]Hunger SP, Mullighan CG Acute Lymphoblastic Leukemia in Children N Engl J Med, 2015.PMID 26465987
[4]Rubnitz JE, Kaspers GJL How I treat pediatric acute myeloid leukemia Blood, 2021.PMID 34115839
[5]Verma A, Lupo PJ, Shah NN Management of Down Syndrome-Associated Leukemias: A Review JAMA Oncol, 2023.PMID 37440251
[6]Sas V, Blag C, Zaharie G Transient leukemia of Down syndrome Crit Rev Clin Lab Sci, 2019.PMID 31043105
[7]Rodriguez-Galindo C, Allen CE Langerhans cell histiocytosis Blood, 2020.PMID 32106306
[8]Rastogi P, Naseem S, Varma N Bone Marrow Involvement in Neuroblastoma: A Study of Hemato-morphological Features Indian J Hematol Blood Transfus, 2015.PMID 25548446
[9]Means RT Jr Pure red cell aplasia Blood, 2016.PMID 27881371
[10]Yoshida N Recent advances in the diagnosis and treatment of pediatric acquired aplastic anemia Int J Hematol, 2024.PMID 36867357
[11]Janssens AM, Offner FC, Van Hove WZ Bone marrow necrosis Cancer, 2000.PMID 10760751
[12]Prusakowski MK, Cannone D Pediatric Oncologic Emergencies Hematol Oncol Clin North Am, 2017.PMID 29078932

Pancytopenia and marrow infiltration

Also known as Pancytopenia · Marrow infiltration · Myelophthisis · Bone marrow failure · Leukoerythroblastic anaemia · Marrow replacement

high12 referencesUpdated 16 July 202631 min readVerification in progress

Practise this topic

Overview & Definition

Paediatrics Fellowship Pro

You have read the opening of this topic. The complete unit — every section and its primary-source references — is part of the Paediatrics Fellowship fellowship atlas.

References12Show ledger

[1]Bhatnagar SK, Chandra J, Narayan S Pancytopenia in children: etiological profile J Trop Pediatr, 2005.PMID 16014764
[2]Fragkandrea I, Nixon JA, Panagopoulou P Signs and symptoms of childhood cancer: a guide for early recognition Am Fam Physician, 2013.PMID 23939697
[3]Hunger SP, Mullighan CG Acute Lymphoblastic Leukemia in Children N Engl J Med, 2015.PMID 26465987
[4]Rubnitz JE, Kaspers GJL How I treat pediatric acute myeloid leukemia Blood, 2021.PMID 34115839
[5]Verma A, Lupo PJ, Shah NN Management of Down Syndrome-Associated Leukemias: A Review JAMA Oncol, 2023.PMID 37440251
[6]Sas V, Blag C, Zaharie G Transient leukemia of Down syndrome Crit Rev Clin Lab Sci, 2019.PMID 31043105
[7]Rodriguez-Galindo C, Allen CE Langerhans cell histiocytosis Blood, 2020.PMID 32106306
[8]Rastogi P, Naseem S, Varma N Bone Marrow Involvement in Neuroblastoma: A Study of Hemato-morphological Features Indian J Hematol Blood Transfus, 2015.PMID 25548446
[9]Means RT Jr Pure red cell aplasia Blood, 2016.PMID 27881371
[10]Yoshida N Recent advances in the diagnosis and treatment of pediatric acquired aplastic anemia Int J Hematol, 2024.PMID 36867357
[11]Janssens AM, Offner FC, Van Hove WZ Bone marrow necrosis Cancer, 2000.PMID 10760751
[12]Prusakowski MK, Cannone D Pediatric Oncologic Emergencies Hematol Oncol Clin North Am, 2017.PMID 29078932