Leukocyte Abnormalities and Disorders (An overview)

Main ideas / lessons

• The video is an overview of leukocyte (white blood cell) abnormalities and disorders in hematology.
• It focuses on characteristic morphologic/anatomical findings on blood smears and how these relate to pathologic vs non-pathologic causes.
• Leukocyte disorders are organized into two major categories by quantity vs quality, and then further subdivided by malignant vs non-malignant and by morphology.

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Leukocyte (WBC) abnormalities discussed (with key meaning)

1) Smudge cells (Basket cells)

• Description: Ruptured white blood cells where the nucleus is left free.
• Can be:
  • Non-pathologic: Occurs due to heavy pressure during smear preparation.
  • Pathologic: May be associated with leukemia.

2) “Twinning deformity” / Hypersegmented neutrophil variant (as described)

• Description: Neutrophil with two diploid nuclei.
• Related conditions mentioned:
  • Hypersegmentation
  • Pernicious anemia

3) Jordan’s anomaly (Foamy cell)

• Description: Cytoplasmic vacuoles/holes, giving a foamy appearance.
• Cause mentioned: Using a 2-hour-old oxalated specimen to prepare the smear.
• Associated with (pathology mentioned):
  • Leukemia
  • Infection
  • Chemical poisoning

4) Tart cell

• Description: A monocyte engulfing a foreign nucleus (engulfed nuclear material).
• Clinical note: Often seen with drug sensitivity, but usually low/no real diagnostic value.
• Important distinction:
  • Do not confuse Tart cells with LE cells.

5) LE cells (characteristic for SLE)

• Description: A phagocytic cell (the video describes a neutrophil-type context) that has engulfed nuclear material coated by antibodies, forming the LE body.
• Associated condition: SLE (Systemic lupus erythematosus)

6) Drumstick / Barr body

• Description: A drumstick-shaped nuclear appendage in neutrophils, basophils, and eosinophils.
• Concept/meaning: Considered sex chromatin = condensed chromatin of the inactive second X in females.
• Sex association:
  • Seen only in females; stated as present in ~1–8% of female neutrophils (not all will show it).
  • If found in a male, suggests Klinefelter syndrome.

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Method of classification presented

A) Leukocyte disorders are categorized into:

• Quantitative (change in count)
• Qualitative (abnormal appearance/morphology)

1) Quantitative disorders

• Further split into:
  • Non-malignant (reactive)
  • Malignant (non-reactive)

a) Quantitative, Non-malignant (Reactive)

• Can be either increased or decreased:

Increased (philia / -philia):

• Neutrophilia
• Lymphocytosis
• Eosinophilia
• Basophilia
• Monocytosis

Decreased (penia / -penia):

• Neutropenia
• Lymphocytopenia
• Eosinopenia
• Basopenia
• Monocytopenia

Examples given:

• Neutrophilia: bacterial infection, trauma
• Lymphocytosis: viral infection
• Eosinophilia: parasitic infection
• Basophilia: chronic myelogenous leukemia, allergies
• Monocytosis: inflammation, infection
• Neutropenia: medication; other immune-mediated causes
• Lymphocytopenia: AIDS; some carcinomas
• Eosinopenia: marrow hypoplasia
• Basopenia: stress, radiation exposure
• Monocytopenia: hemodialysis; steroid therapy

b) Quantitative, Malignant

• Split into:
  • Myeloproliferative diseases
  • Lymphoproliferative diseases

i) Myeloproliferative diseases (mentioned)

• Acute myelocytic leukemia (AML)
• Chronic myelogenous leukemia (CML)
• Polycythemia vera
• Essential thrombocytosis

Related malignant morphologic finding mentioned:

• Auer rods (rod-like bodies staining reddish purple)
  • Can be seen in multiple number
  • Also noted for acute myelocytic leukemia

ii) Lymphoproliferative diseases (mentioned)

• Associated with lymphocytes
• Includes:
  • Lymphomas
  • Plasma cell leukemia

Related malignant morphologic findings mentioned:

• “Raider cell / Rader cell” (lymphocytes with pseudolobulations; said to be seen in CLL)
  • Normal lymphocytes described as having one nucleus with no lobulations
  • Raider/rader cells resemble cloverleaf-like lobulations
• Hairy cells (hairy cell leukemia)
  • Characteristic feature: irregular gray-blue hair-like cytoplasmic projections
  • Stain reaction mentioned: tartrate-resistant acid phosphatase shows red granular cytoplasmic staining

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2) Qualitative disorders

• Divided into three morphological “types/conditions”:
  1. Morphologic abnormalities
  2. Normal morphology (with specific conditions)
  3. Morphologic changes present (specific examples)

a) Qualitative disorders: Morphologic abnormalities (examples stated)

• Pelger–Hüet anomaly

  • Neutrophils fail to segment properly → bilobed nucleus connected like a dumbbell
  • Seen in leukemia (video also mentions infectious mononucleosis)

• Hypersegmented neutrophils (Macropolysegmented / discussed as “macropoliside”)

  • Neutrophils with 6–10 lobes
  • Seen in pernicious anemia

• Alder–Reilly anomaly

  • Cells with large coarse dark purple azurophilic granules
  • Seen in Alder–Reilly anomaly and mucopolysaccharide storage diseases, including Hurler/Hunter syndrome
  • Video links Hurler/Hunter to gargoyle features

• Chédiak–Higashi granules

  • Very large red/blue cytoplasmic granules
  • Associated with Chédiak–Higashi syndrome
  • Video notes decreased phagocytic activity

• May–Hegglin anomaly

  • Looks like Döhle bodies (“dollar bodies”)
  • Key triad described to distinguish it:
    • Thrombocytopenia
    • Giant platelets
    • Inclusion body (May–Hegglin anomaly)

b) Qualitative disorders: Normal morphology

• The video mentions:
  • Chronic disease
  • Leukocyte adhesion disorders
• (No further detail given in the subtitles beyond naming.)

c) Qualitative disorders: Morphologic changes present (examples stated)

• Toxic granulation

  • Neutrophils with blue-black cytoplasmic granules
  • Compared visually to basophils but actually neutrophils
  • Seen in acute infection, burns, drug poisoning

• Döhle bodies (“dollar bodies”)

  • Small pale blue peripheral cytoplasmic bodies
  • Described as remnants of ribosome/endoplasmic reticulum
  • Seen in severe infections and severe burns
  • Video notes they can look similar to May–Hegglin but differentiates via platelet appearance (platelets are not giant in Döhle bodies)

• Downy cell (atypical stimulated lymphocytes)

  • Seen in infectious mononucleosis
  • Described as a “ballerina skirt cell” appearance

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Speaker / sources featured (from the subtitles)

• No individual speakers are explicitly named in the provided subtitles.
• Source is an educational YouTube hematology video, but the creator/author is not identified in the transcript.