IMG_20260929_232337.jpg
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"acute lymphoblastic leukemia" AND diagnosis
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acute lymphoblastic leukemia children diagnosis peripheral blood smear lymphoblasts thrombocytopenia authoritative
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1. Stain and peripheral smear findings
Stain: Leishman stain / Romanowsky stain.
Peripheral smear:
| Component | Findings |
|---|---|
| RBCs | Moderate anemia (Hb 9 g/dL). Predominantly normocytic to mildly microcytic, mildly hypochromic red cells with mild anisocytosis. |
| WBCs | Marked leukocytosis: TLC 120,000/µL. Differential count shows 75% lymphoblasts. Blasts are medium-sized cells with high nuclear-cytoplasmic ratio, scant basophilic cytoplasm, fine/open chromatin, and 1-2 inconspicuous nucleoli. No Auer rods. Neutrophils are relatively reduced (21%). |
| Platelets | Markedly decreased: 30,000/µL, consistent with thrombocytopenia. |
2. Neat labeled diagram: Lymphoblast
Lymphoblast
__________________
/ \
/ \
| Fine chromatin |
| NUCLEUS |
| ○ ○ | ← Nucleoli
| |
| |
| Thin rim of scanty | ← Scant basophilic cytoplasm
| cytoplasm |
\ /
\___________________/
↑ High N:C ratio
3. Provisional diagnosis
Acute lymphoblastic leukemia (ALL), most probably precursor B-cell ALL.
This is the commonest acute leukemia in children. ALL is characterized by accumulation of lymphoblasts in bone marrow and peripheral blood, with suppression of normal blood-cell production, as described by the NCI ALL overview.
4. Points in favour of ALL
- Age: 6 years, which is the typical age group for ALL.
- Symptoms of bone-marrow failure:
- Fatigue due to anemia
- Recurrent fever and urinary infection due to defective normal leukocyte production
- Recurrent epistaxis and petechiae due to severe thrombocytopenia
- Organ infiltration: Hepatosplenomegaly due to leukemic infiltration/extramedullary hematopoiesis.
- CBC findings:
- Anemia: Hb 9 g/dL
- Severe thrombocytopenia: platelet count 30,000/µL
- Marked leukocytosis: TLC 120,000/µL
- Peripheral smear: Predominance of lymphoblasts (75%), with morphology consistent with lymphoblasts and no Auer rods.
- Diagnosis should be confirmed by bone marrow aspiration/biopsy, flow-cytometric immunophenotyping, cytogenetic and molecular studies. Identification of lymphoid blasts in marrow is used to confirm ALL, as outlined by Blood Cancer United.
IMG_20260929_232350.jpg
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"acute myeloid leukemia" AND diagnosis
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acute myeloid leukemia diagnosis peripheral smear myeloblasts Auer rods authoritative
1. Peripheral smear findings
Stain: Leishman stain / Wright-Giemsa stain.
| Component | Findings |
|---|---|
| RBCs | Moderate anemia, Hb 8.5 g/dL. RBCs are predominantly microcytic hypochromic, with mild anisocytosis. |
| WBCs | Marked leukocytosis: TLC 135,000/µL. Myeloblasts 35% are seen. They are large cells with high nuclear-cytoplasmic ratio, round to oval nucleus, fine chromatin, 2-4 nucleoli, and moderate basophilic cytoplasm with azurophilic granules. Auer rods may be seen in blast cytoplasm. Remaining DLC: neutrophils 25%, lymphocytes 35%, monocytes 3%, eosinophils 2%. |
| Platelets | Reduced: 75,000/µL, indicating thrombocytopenia. |
2. Neat labeled diagram: Myeloblast
MYELOBLAST
______________________
/ \
| Fine chromatin |
| Nucleus |
| ○ ○ ○ | ← Prominent nucleoli
| |
| |
| Moderate basophilic |
| cytoplasm |
| ───── | ← Auer rod
\ /
\_____________________/
↑ High nucleus:cytoplasm ratio
3. Provisional diagnosis
Acute myeloid leukemia (AML).
4. Points in favour of AML
- Age: AML is more frequent in adults and the patient is 52 years old.
- Clinical features of marrow failure:
- Pallor and fatigue due to anemia
- Fever due to infection/neutropenia or dysfunctional leukocytes
- Gum bleeding and petechiae due to thrombocytopenia
- Mild hepatosplenomegaly suggests leukemic infiltration.
- Marked leukocytosis: TLC 135,000/µL.
- Circulating myeloblasts constitute 35% of leukocytes.
- Myeloblast morphology, particularly cytoplasmic granules and Auer rods when present, supports myeloid lineage. Auer rods are characteristic of AML and high-grade myelodysplastic syndromes. Goldman-Cecil Medicine International Edition, Fig. 143-25.
- Associated anemia and thrombocytopenia reflect replacement/suppression of normal bone-marrow hematopoiesis.
Confirmation requires bone-marrow examination, cytochemistry such as myeloperoxidase, flow cytometry, cytogenetics, and molecular testing. The Merck AML diagnostic summary notes that peripheral blasts and Auer rods support AML, with marrow and genetic testing used for diagnostic classification.
IMG_20260929_232350.jpg
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1. Peripheral smear examination
Stain: Leishman stain / Wright-Giemsa stain.
RBCs
- Moderate anemia: Hb 8.5 g/dL.
- Predominantly microcytic hypochromic RBCs based on low MCV (76.1 fL) and MCHC (29.4 g/dL).
- Mild anisocytosis may be present.
WBCs
- Marked leukocytosis: TLC 135,000/µL.
- Numerous circulating myeloblasts (35%).
- Myeloblasts are large cells with:
- High nuclear-cytoplasmic ratio
- Round/oval nucleus
- Fine, delicate chromatin
- 2-4 prominent nucleoli
- Moderate basophilic cytoplasm
- Fine azurophilic granules
- Needle-like Auer rods may be demonstrable in some blasts
- DLC: neutrophils 25%, lymphocytes 35%, monocytes 3%, eosinophils 2%, basophils 0%, myeloblasts 35%.
Platelets
- Decreased: 75,000/µL, indicating thrombocytopenia.
2. Labeled diagram of a myeloblast
MYELOBLAST
______________________
/ \
| Fine chromatin |
| NUCLEUS |
| ○ ○ ○ | ← Nucleoli
| |
| Moderate basophilic |
| cytoplasm |
| ───── | ← Auer rod
\ /
\______________________/
High nucleus:cytoplasm ratio
3. Provisional diagnosis
Acute myeloid leukemia (AML).
4. Points in favour of AML
- Adult age group: Patient is 52 years old. AML is more common in adults.
- Features of marrow failure:
- Pallor and fatigue due to anemia
- Fever due to infection
- Gum bleeding and petechiae due to thrombocytopenia
- Mild hepatosplenomegaly, suggesting leukemic infiltration.
- Marked leukocytosis: TLC is 135,000/µL.
- Myeloblasts constitute 35% of peripheral leukocytes, strongly indicating acute leukemia of myeloid lineage.
- Blast morphology is consistent with myeloblasts, and the presence of Auer rods, if seen, supports AML.
- Associated anemia and thrombocytopenia result from suppression of normal bone-marrow hematopoiesis by leukemic cells.
Auer rods are cytoplasmic inclusions found in myeloid blasts and are characteristic of AML. Goldman-Cecil Medicine International Edition, Fig. 143-25.
Confirmation: Bone-marrow aspiration/biopsy, myeloperoxidase or Sudan black B cytochemistry, flow-cytometric immunophenotyping, cytogenetic testing, and molecular studies.
IMG_20260929_232403.jpg
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"sickle cell disease" AND diagnosis
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sickle cell disease diagnosis peripheral smear sickle cells hemoglobin S mutation authoritative
1. Peripheral smear findings
Stain: Leishman stain / Wright-Giemsa stain.
| Component | Findings |
|---|---|
| RBCs | Moderate anemia, Hb 8.3 g/dL. Marked anisopoikilocytosis with numerous sickle cells (drepanocytes), shown by the arrows. Microcytosis is present (MCV 64 fL). Target cells, polychromatophilic cells, and occasional nucleated RBCs may be seen. Reticulocytosis is present: 7%. |
| WBCs | Total WBC count is normal: 7,300/µL. DLC is essentially normal: neutrophils 57%, lymphocytes 35%, monocytes 5%, eosinophils 3%. |
| Platelets | Adequate/normal: 1.9 lakh/µL. |
2. Labeled diagram: Sickle cell
SICKLE CELL / DREPANOCYTE
__________
___/ \___
__/ \__
/ \
\__ __/
\___ ___/
\__________/
Crescent-shaped, elongated RBC
Pointed ends due to HbS polymerization
3. Provisional diagnosis
Sickle cell disease, most likely sickle cell anemia (HbSS), presenting with vaso-occlusive crisis and probable acute chest syndrome.
The combination of fever, cough, dyspnea, chest pain, severe limb pain, priapism, jaundice, splenomegaly, chronic transfusion history, and sickled RBCs is strongly supportive. Sickle cells result from polymerization of deoxygenated hemoglobin S. Costanzo Physiology 7th Edition, section on O₂ bound to hemoglobin.
4. Genetic abnormality
A missense point mutation in the beta-globin gene (HBB) on chromosome 11 causes hemoglobin S.
- Normal codon 6: GAG coding for glutamic acid
- Mutant codon 6: GTG coding for valine
- Amino-acid substitution: β6 Glu → Val
Thus, hemoglobin S is α₂βS₂. In HbSS disease, the patient inherits the HbS gene from both parents. The abnormal beta chain causes deoxygenated HbS to polymerize, distorting RBCs into the characteristic sickle shape.
5. Points in favour of the diagnosis
- Typical recurrent vaso-occlusive pain crises involving the lower limbs and chest.
- History of priapism, a recognized complication of sickle cell disease.
- Anemia with Hb 8.3 g/dL and raised reticulocyte count (7%), indicating chronic hemolysis with marrow response.
- Icterus, due to increased bilirubin production from hemolysis.
- Splenomegaly, consistent with hemolytic anemia/sickle cell disease.
- Peripheral smear shows sickle-shaped RBCs, the key morphological feature.
- Chest pain, cough, fever, and dyspnea suggest acute chest syndrome, an important sickle cell complication.
- Multiple prior transfusions support a chronic severe hemolytic disorder.
Diagnosis is confirmed by hemoglobin analysis, such as Hb electrophoresis or HPLC, demonstrating HbS, with molecular testing if needed. The NHLBI diagnostic guidance notes that blood testing can determine the presence and amount of hemoglobin S, while genetic testing can confirm the genotype.
IMG_20260929_232417.jpg
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"beta thalassemia" AND diagnosis
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beta thalassemia major diagnosis peripheral smear HbF elevated HbA2 authoritative
1. Peripheral smear findings
Stain: Leishman stain / Wright-Giemsa stain.
| Component | Findings |
|---|---|
| RBCs | Severe microcytic hypochromic anemia: Hb 5 g/dL, MCV 51 fL. Marked anisocytosis and poikilocytosis. Numerous microcytes, hypochromic cells, target cells, pencil/elliptical forms, polychromasia and occasional nucleated RBCs are expected. Basophilic stippling may be seen. Reticulocytosis is present (6%). |
| WBCs | Total count is normal: 7,300/µL. Differential count is within normal limits: neutrophils 52%, lymphocytes 40%, monocytes 5%, eosinophils 3%. |
| Platelets | Adequate/normal: 1.9 lakh/µL. |
2. Labeled diagram: Target cell
TARGET CELL / CODocyte
___________
.-' '-.
/ \
| _______ |
| / \ | ← Central hemoglobinized area
| \_______/ |
| Pale zone | ← Zone of central pallor
\ /
'-._________.-'
Peripheral rim of hemoglobin
3. Provisional diagnosis
Beta-thalassemia major (Cooley anemia).
The skull radiograph represents a hair-on-end / crew-cut appearance, caused by expansion of the marrow spaces due to marked erythroid hyperplasia.
4. Points in favour of beta-thalassemia major
- Early childhood presentation with severe weakness, fatigue and dyspnea.
- Severe chronic anemia: Hb 5 g/dL.
- Marked microcytosis: MCV 51 fL, with relatively high RBC count (5.5 million/µL) despite severe anemia, which favors thalassemia over iron deficiency.
- Peripheral smear shows microcytic hypochromic cells with marked anisopoikilocytosis and target cells.
- Hemolysis: icterus and reticulocytosis (6%).
- Massive hepatosplenomegaly, due to extramedullary hematopoiesis and increased RBC destruction.
- Chipmunk facies, frontal bossing and malocclusion result from marrow expansion.
- Hair-on-end skull X-ray appearance due to erythroid marrow hyperplasia.
- Both parents have fatigue, which may indicate beta-thalassemia trait in the parents.
- Hemoglobin analysis shows markedly raised HbF (75%) and raised HbA₂ (4.5%).
5. Hemoglobin electrophoresis pattern
Expected pattern in beta-thalassemia major:
| Hemoglobin fraction | Pattern |
|---|---|
| HbF | Markedly increased, about 75% in this case |
| HbA₂ | Increased, 4.5% in this case |
| HbA | Absent or markedly reduced, depending on whether the mutation is β⁰ or β⁺ |
Thus, the reported electrophoresis is:
HbF : 75% ↑↑
HbA2 : 4.5% ↑
HbA : markedly decreased / absent
The main underlying defect is reduced or absent beta-globin-chain synthesis due to pathogenic variants in the HBB gene on chromosome 11. Severe beta-thalassemia produces microcytic hypochromic anemia, marrow expansion with bone deformity, and extramedullary hematopoiesis, consistent with this case. The NCBI beta-thalassemia reference describes markedly raised HbF in beta-thalassemia major and the typical microcytic, hypochromic smear.
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