Interactive cases: Prof Bain and Prof McDonald Flashcards
1
Q
How to distinguish between thymoma and ALL?
A
In thymoma you wouldn’t get high WCC unlike in ALL
ALL:
- high WCC count
- Blast cells
- possible anaemia/thrombocytopaenia due to bone marrow infiltration
- possible enlagment of organs i.e. Testes, thymus
**NB: T-cell ALL can cause a thymoma**
2
Q
Immunophenotyping vs cytochemistry
A
Immunophenotyping: used to distinguish between AML and ALL. uses flow cytometry.
Cytochemistry: looks for specific things in cells using stains. not used much anymore.
3
Q
What does high WCC in acute leukamiea signify in terms of prognosis?
A
Bad prognosis that reduces the chances of cure
4
Q
What does a coagulation screen include?
A
APTT
PT
Bleeding time
*does nOT include platelet count - this is done in FBC*
5
Q
Coagulation screen in DIC
A
- APTT:
- initially SHORT - because there’s so much activation of the clotting factors
- then later prolonged as clotting factors get used up
- PT
- prolonged
- Bleeding time
- prolonged
- Fibrinogen
- low
- FDP (D-dimer)
- elevated
6
Q
What test confirms DIC?
A
D-dimer
7
Q
Which leukamiea is associated with DIC?
A
APML
8
Q
Which ethnicities tend to have lower neutrophil counts?
A
Afrocarribbeans and Africans
ethnic neutropenia whereby Africans and Afro-Caribbeans could have lower neutrophil count and this might be NORMAL.
9
Q
Name a key haemoatological cause of macrocytic non-megaloblastic anaemia?
A
Myelodysplastic syndrome
Also multiple myeloma and myeloproliferative disorders
10
Q
What causes megaloblastic anaemia?
A
Vitamin B12 or folate deficiency or cytotoxic drugs
there are no haematological malignancies that cause megaloblastic anaemia
11
Q
Anti IF vs anti parietal cell antibodies
A
anti-IF: more specific for pernicious anaemia
anti-parietal cell: more sensitive
12
Q
Platelet count and RBC in essential thrombocythaemia vs PCV
A
PCV:
- erythrocytosis
- thrombocytosis
ET:
- isolated thrombocytosis
13
Q
PCV treatment
A
- venesection: lower the Hb
- hydroxycarbamide: lowers platelet count
- aspirin to reduce thrombosis risk
14
Q
Testicular swelling, 3-5 year old
A
ALL
15
Q
A
16
Q
Auer rods
A
AML
17
Q
Philadelphia chromosome
t (9:22)
BCR-ABL-1
Left shift
A
CML
*left shift means that you seei mmature myeloid cells in the bloodstream*
18
Q
Smear cells/smudge cells
A
CLL
or small cell lymphoma
19
Q
JAK2+
High haematocrit
flushed appearance
strokes/budd chiari
A
PCV
Budd chiari: Hepatic veins (veins that drain the liver) are blocked or narrowed by a clot (mass of blood cells).
20
Q
high platelets
strokes
may have jak2 mutation
A
ET
21
Q
Dry tap, teardorp cells (dacrocytes), massive splenomegaly
A
Myelofibrosis
22
Q
Painful LNs with alcohol
Reed0sternberg cells
EBV+
A
Hodgkin’s
23
Q
t(14,18); centroblasts
A
Follicular lymphoma
*low grade B cell NHL
24
Q
t(11,14)
mantle cells
A
mantle cell lymphoma
*aggressive B cell NHL
25
t (8,14)
starry sky appearance
EBV+
HIV+
Burkitt's
26
CRAB+
Bence jones protein\IgG/A \> 30
Multiple myeloma
\*\*rmb IgM - waldernstrom's
27
No CRAB
Paraprotein \< 30 (but elevated)
MGUS
28
WBC count normal range
Females: 4.5 to 11.0 × 109/L
Males: 4.5 to 11.0 × 109/L
29
Hb normal range: males and females
Females: 12.0 to 15.5 grams per deciliter (120-155 grams/litre)
Males: 13.5 to 17.5 grams per deciliter (135-175 grams/ litre)
30
MCV normal range
Females: 80-96 femtolitres per cell
Males: 80-96 femtolitres per cell
\*\*basc above 100 is marocytosis
31
Platelet count normal range
Males + females: 150-400 x 109/L
32
How to distingiush between PCV and chronic hypoxia induced polycythaemia (secondary polycthaemia)?
PCV:
* thrombocytosis + erythrocytosis
* low erythropoietin
* Jak 2 mutation
In secondary polycythaemia you would get:
* isolated erythrocytosis
* high erythropoietin
* no Jak 2 mutation
33
Test to confirm PCV
FBC:
* High HB + Hct
* high platelets
* high MCV
* WBC normal (or moderately raised)
JAK2 mutation - DIAGNOSTIC- this is the first one to do; usually this is enough
Bone marrow aspirate + trephine biopsy
* Increased cellularity- i..e **no fat spaces**, all being occupied by mature cells
* moderate reticulin fibrosis
serum EPO - low
34
Reactive neutrophilia vs CML vs AML
Reactive
* neutrophillia i.e. 15-20)
* band cells (neutrophils without segmented nucleus)
* toxic granuloation
* vacuolation
* no immature cells
CML
* neutrophilia i.e. (50-500 x 109/L)
* basiphilia
* immature myelocytes BUT **NO excess myeloblasts (\< 5%) in the bone marrow**
* eosinophilia
AML
* neutrophilia i.e. \> 300)
* myeloblasts (even more immature than myelocytes)
35
high WCC, RBC count, Hb is upper limit of normal
neutrophilia
basophilia
eosinophilia
CML
\*\*you can have high RBC\*
36
What causes gangrenes?
**Abnormlaities of the blood vessels -** atheroscleorsis
**Abnormalities of the circulating blood**-
* **polycythaemia:**
* **cold agglutinin:** which causes the RBCs to stick together in the cold
* **cryoglobulinaemia:**protein that precipitates in the cold which blocks blood vessels
37
Isolated thrombocytopaniea in an elderly man
Autoimmune thrombocytopaniea purpura
38
Differentials for bruising in a child
1. NAI
2. thrombocytopaenia
- autoimmune thrombocytopaenia
- alloimmune thrombocytopaenia
- ALL
3. coagulation disorders
- haemophilias- **most likely**
- VWD
39
What does high RCDW mean?
**RDW= red cell distribution width**
RDW= red cell distribution width (which is high) – this tells you there is anisocytosis: diff sized cells present
40
What haematological abnormalities can be seen in patients with rheumatoid arthritis?
* anaemia of chronic disease
* iron deficiency anaemia
* haemorrhage due to aspirin and NSAIDS
* neutropaenia or thrombocytopaniea
* due to drugs
* Felty syndrome
* due to the inflammation
41
What is felty syndrome?
Triad of
* neutropaenia
* splenomegaly
* raised ESR
42
43
Osteomyelitis x-ray changes
* patchy changes in bone
\*distinguishes it from septic arthritis
44
Red herrings in osteomyelitis
* fever may not be present
* WCC may not be raised
CRP is usually always raised
---\> can still be osteomyelitis
45
DDx of MAHA
1. HUS
2. TTP
3. DIC
46
TTP pentad
+ defect
+ treatment
**Pentad:**
* MAHA
* thrombocytopaenia
* renal failure
* fever
* neurological symptoms eg altered consciousness
**Defect:**
deficiency of ADAMSTS13 enzyme: von Willebrand factor cleaving protease
Causes multimers of VWF to form and cause platelet clots
47
How to treat TTP?
DO NOT GIVE PLATELET TRANSFUSION BECAUSE THIS MAKES THE CONDITION WORSE!!
tx: plasma exchange
48
Blood film features of hyposplenism
Howell–Jolly bodies - nuclear remnants
Target cells
Occasional nucleated red blood cell
Lymphocytosis
Macrocytosis
Acanthocytes
49
Normal myeloblast and lymphoblast counts in bone marrow vs myelodysplasia + AML and ALL
_myeloid cells_
\<5%: normal
5-20%: myelodysplasia
\>20%: AML
_lymphoid cells_
\<5%: normal
\>20%: ALL
50
Key marker of lymphoblasts
TDT positive
51
What may myeloblasts have in their cytoplasm?
Aeur rods
52
Which cell markers are expressed on mature B cells?
CD19: receptor for CAR T cells
CD20: receptor for rituximab
53
Cell surface markers of peripheral blood lymphoid T cells
CD3
CD4- helper T cells
CD8- cytotoxic T cells
**CD5**
54
How to distinguish between immature and mature lymphoid cells?
Immature: TDT positive
Mature: TDT negative
\*\*true for T and B lymphocytes
55
How to distinguish between mature and immature B cells?
Mature B cells and plasma cells express surface Ig
56
Which receptor on B cells to CART cells bind to?
CD19
57
If you see myeloblasts in the blood film what does that suggest?
1) AML
2) leukoerythroblastic anaemia
58
What single test distinguishes autoimmune from inherited haemolytic anaemia?
DAT test
Positive: autoimmune haemolytic anaemia
59
If you see spherocytes what two diagnoses are suggested?
1) autoimmune haemolytic anaemia
2) hereditary spherocytosis
60
What type of anaemia is haemolytic anaemia?
Can be macrocytic- because of reticulocytes are larger than normal rbc
61
Give causes of non-immune acquired haemolytic anaemia
1. malaria!!!
2. MAHA- HUS, TTP, DIC
3. paroxysmal nocturnal haemoglobinuria
62
How can SLE affect the platelets?
Can cause idiopathic thrombocytopaenic purpura
63
Causes of autoimmune haemolytic anaemia: key
Warm: SLE, drugs, CLL (evan's syndrome)
Cold: mycoplasma, other infections
64
ACD vs iron deficiency anaemia
The key is transferrin!!!
Iron deficiency anaemia: high transferrin
ACD: low/normal transferrin
65
What protein mediates anaemia of chronic disease
hepcidin
\*this is raised in ACD as it's an inflammatory protein
it sequesters iron in macrophages so it's low in the blood
66
Can you get IDA with normal ferritin?
Yes!! If you have co-existent ACD
67
68
Isolated single lineage cytopaenia: causes
69
If you have very high MCV (higher than 120)- what are the top differentials?
B12 or folate deficiency
70
What does pancytopaenia with tear drop cells, nucleated RBC and immature granulocytes in blood film suggest?
Leukoerythroblastic anaemia- i.e. bone marrow infiltration
- haematological cancer: leukaemia, lymphoma, myeloma
- metastatic: prostate, breast, lung
71
Chronic vs acute leukemia: white cell count
Chronic always has high white cell count (Acc to Prof McDonald)
72
Classification of pancytopaenia
73
- normal Hb
- VERY HIGH WCC
- normal lymphocytes
- raised neutrophils
Confirmatory test?
CML
BCR-ABL1 gene fusion i.e philadelphia chromosome
74
What type of protein is ABL?
Tyrosine kinase
75
Treatment for CML
Tyrosine kinase inhibitor- imatinib
76
Do you see myeloblasts or myelocytes in CML?
Myelocytes - in chornic phase
if you see \>20% blasts --\> blast crisis
77
Which cell surface marker is aberrently expressed in CLL?
CD5 and CD23 POSITIVE markers
* NOTE: CD5 and CD23 should **_never_** be seen in a **normal B cell**
78
Main prognostic factor for CLL
TP53 mutation status
79
Link between CLL and anaemia
CLL can cause haemolytic anaemia
as it is a disease of the immune system
80
Can you exclude myeloma if you have normal plasma imuunoglobulin?
No- can have light chain only myeloma
Need to check serum free light chains or urine bence jones protein
81
What is the cause of renal failure in myeloma?
Cast nephropathy
- deposition of light chains in the basement membrane precipitating renal failure
82
Name a JAK1 inhibitor
Ruxolitinib
83
What causes raised ESR?
raised acute phase proteins such as fibrinogen
\*\*promotes rouleaux formation
84
Causes of isolated raised ESR and normal CRP
SLE
Multiple myeloma
lymphoma
pregnancy
anaemia
85
86
translocation : t(11,14) associated to which malignancny
mantle cell lymphoma- agressive high grade NHL
87
* A 5y/o boy of Indian ethnic origin presented with lymphadenopathy and a mediastinal mass on chest radiology
* WBC: 180 x 109/L
* Hb: 93g/L
* Platelet count: 43 x 109/L
what is the diagnosis
**ALL**
* there are blast cells present on blood film
* there was a VERY HIGH WCC
* The **low Hb and platelet count** are the result of **bone marrow infiltration**
* mediastinal mass is the thymus, which is infiltrated by T lymphoblasts
The _VERY HIGH **WCC**_ in a child means a diagnosis of **leukaemia** is almost CERTAIN
88
48y/o male- railway engineer
* 2 week history of bleeding gums
* Attended dentist- severe bleeding
* 1 episode of haematuria
* Minor bruising
* Attended A&E
_O/E_
* Left subconjunctival haemorrhage
* Small bruises over the abdomen
* No enlarged lymph nodes
* No hepatosplenomegaly
**QUESTION 3: What test is most likely to reveal the cause of the problem?**
* **Blood count, film and coagulation screen**
## Footnote
**would also do LFTs and creatinine as this sounds like a very ill patient**
89
**How could you explain a SHORT APTT and a low fibrinogen?**
* DIC
* The APTT is short is because there are activated coagulation factors in the circulation which is making it short
* will also have **severe thrombocytopaenia and low fibrinogen**
90
what does this blood film show
granules AND Auer rods
would suspect these cells are MYELOID
91
* _Granules_ strongly suggest _which lineage_
_myeloid_
92
What diagnosis do you suspect on a background of abnormal clotting
hyper-granular (very granular) promyelocytes (blast looking)
**Acute promyelocytic leukaemia**
93
**Which tests would be the most useful to confirm the APML**
* **Cytogenetic analysis/ FISH/ molecular genetic analysis**
* Do NOT need cytochemistry as you can see the brightly stained granules.
* Immunophenotyping can help but it is less specific than **cytogenetic analysis** to show the **translocation** or **FISH** to show the **15;17 fusion gene**
**Fish:** FISH showed ***PML-RARA*** fusion
94
what is treatment for APML + prognosis
* Platelets
* Chemotherapy
* **All-*trans*-retinoic acid** (**ATRA**)
_Complete remission_ can be achieved
95
* 68 y/o woman, retired secretary
* Gradual onset of fatigue, lethargy and exertional dyspnoea
* Non-smoker, not much alcohol, good diet
_O/E:_
* Pallor (conjunctival and nail bed)
* Mild ankle oedema
which one test should you do next :
* Blood film
* Bone marrow aspirate
* Liver function tests
* Thyroid function tests
* Serum Vitamin B12 and red cell folate
Blood film
In reality, with a macrocytosis you would also do Vitamin B12 and Cell folate and LFTs
96
what does this show
* There are **_macrocytes_** but **NO oval macrocytes nor hypersegmentation of neutrophils**
* There are **_hypochromic microcytes_**
* There is also an **elliptocyte**
* This is a **dimorphic film**
* This is NOT associated with B12/ folate deficiency, hypothyroidism or liver disease
97
what does this show of bone marrow aspirate
* shows **increased blast cells** (12%)- the normal is \< 5%
* **_ring sideroblasts_** (can see the *_ring of iron-containing granules around the nucleus)_*
## Footnote
*__*
**DIAGNOSIS: myelodysplastic syndrome with excess blasts**
98
* 72y/o Indian woman
* Vegetarian, teetotal, non-smoker
* SOBOE
* Fatigue
* Painful gums and tongue
* Unable to eat spicy food
O/E: pallor only
FBC:
* low Hb
* normal platelets
* high MCV
* normal WCC
what does this show + What is the most important test
hyper-segmented neutrophils
_macrocytes_ and _oval macrocytes_ too
**Vitamin B12 and folate assays**
99
what is the next investigation to do if there is unexplained macrocytes (normal B12 + folate) and elevated LDH
Bone marrow aspirate
100
101
if anaemia was caused by vitamin B12 and folate what would you see in the blood film
oval macrocytes
macrocytosis
hypersegmented nuclei
102
what is the diagnosis of this blood film
* Giant metamyelocytes are present
* Megaloblasts are also present
* Hyper-segmented neutrophils can also be seen
This is CLASSICAL for a vitamin B12 and folate deficiency
103
+ What test would you do next to try and confirm the diagnosis?
* **Polycythaemia vera**
* With polycythaemia vera, you also often have a:
* **High platelet count**
* **High WCC**
Note: Essential Thrombocythemia, there is an isolated high platelet count
* **Molecular analysis for *JAK2* mutation**
104
what does this show
* The RBC, Hb and Hct are HIGH
* The patient appears to be **polycythaemic**
This can be true or pseudopolycythaemia- canno tell from these results
105
identify which is normal/abnormal + most likely diagnosis given this is seen on a background of low Hb and MCV
* The left film= normal, right film= abnormal
hypochromia (increased pallor in the centre of the RBCs)- **confirms anaemia**
some poikilocytes and anisocytosis
* **Iron deficiency anaemia**
106
107
what is the likley diagnosis
* **Osteomyelitis**
* The abnormality in the bone (patchy changes) points you to osteomyelitis more so than septic arthritis
Note can get osteomyleitis in the absecne of fever, raised WCC. but CRP would almost always be high
108
* 21-year-old woman presented with abdominal pain, bruising and altered level of consciousness
* She had a low-grade fever
* Her platelet count was 15 x 109/L
* Her bilirubin was increased and LDH was gently increased
Her creatinine was marginally increased
**QUESTION 8: What is the most likely diagnosis?**
* There are RBC fragments - **indicative of MAHA**
* Microspherocytes are present
* **Thrombotic thrombocytopaenic purpura**
109
most common complication of infectious mononucleiosis
* splenomegaly occurs in 50% of patients with infectious mononucleosis
* Splenic rupture occurs in 0.1-0.5% of patients
110
risks of hyposplenism
* Overwhelming bacterial sepsis (particularly pneumococcal or H. influenzae
* Fatal malaria
* Fatal *Capnocytophaga canimorsus* infection (typically occurs from dog bites)
* Babesiosis (parasitic infection
111
follow up for hyposplenism
* Vaccinate for:
* Pneumococcus
* Meningococcus
* *Haemophilus influenzae*
* Vaccinate against influenza
* Prescribe life-long penicillin
* Advise the patient on:
* Dog bites
* Travel to malaria zones
* Prompt treatment of infection
* Issue a splenectomy card and information sheet
