COMPLEX CLINICAL CASES AND
APPLIED PATHOPHYSIOLOGY
100 Questions | Six Sections | Clinical Scenarios | Answers and Detailed Rationales
SECTION 1: Complex Cellular, Inflammatory, and Oncologic Disorders (Question
m m m m m m m m
s 1–20)
m
Question 1. A patient receiving chemotherapy develops severe neutropenia. Whi
m m m m m m m m m
ch complication is the greatest immediate concern?
m m m m m m
A. Opportunistic infection
m m
B. Hypercalcemia
m
C. Increased blood viscosity
m m m
D. Excessive erythrocyte production
m m m
Correct Answer: A. Opportunistic infection
m m m m
Rationale: Neutrophils are essential for defense against bacterial and fungal infec
m m m m m m m m m m
tions. Severe neutropenia substantially increases infection risk, and fever may be
m m m m m m m m m m
mthe only early sign of a serious infection.
m m m m m m m
Question 2. A patient has a malignancy that produces excess parathyroid hormo
m m m m m m m m m m m
ne-related peptide (PTHrP). Which metabolic abnormality is most likely?
m m m m m m m m
A. Hypercalcemia
m
B. Hypocalcemia
m
C. Severe hypoglycemia
m m
D. Hypernatremia
m
Correct Answer: A. Hypercalcemia
m m m
Rationale: PTHrP can mimic some actions of parathyroid hormone, increasing bo
m m m m m m m m m m
ne resorption and renal calcium retention. Certain malignancies produce PTHrP,
m m m m m m m m m m
causing humoral hypercalcemia of malignancy.
m m m m
Question 3. A patient has a tumor with a high Ki-
m m m m m m m m m m
67 proliferation index. What does this indicate?
m m m m m m
,A. A high proportion of actively proliferating tumor cells
m m m m m m m m
B. Complete absence of cell division
m m m m m
C. Normal tissue differentiation
m m m
D. Absence of malignant potential
m m m m
Correct Answer: A. A high proportion of actively proliferating tumor cells
m m m m m m m m m m
Rationale: Ki- m
67 is a marker of cellular proliferation. A higher index indicates that a greater pr
m m m m m m m m m m m m m m
oportion of tumor cells are cycling, although its prognostic meaning depends on
m m m m m m m m m m m m
the tumor type.
m m
Question 4. A patient with a chronic wound develops a malignant tumor arising f
m m m m m m m m m m m m m
rom the epithelial lining. Which cancer classification applies?
m m m m m m m
A. Carcinoma
m
B. Sarcoma
m
C. Lymphoma
m
D. Myeloma
m
Correct Answer: A. Carcinoma
m m m
Rationale: Carcinomas arise from epithelial cells. Sarcomas arise from mesenchy
m m m m m m m m m
mal tissues, lymphomas from lymphoid cells, and myelomas from plasma cells.
m m m m m m m m m m
Question 5. A patient with cancer develops unexplained hyponatremia due to tu
m m m m m m m m m m m
mor secretion of antidiuretic hormone. Which paraneoplastic condition is presen
m m m m m m m m m
t?
A. SIADH
m
B. Diabetes insipidus
m m
C. Primary hyperaldosteronism
m m
D. Cushing syndrome
m m
Correct Answer: A. SIADH
m m m
,Rationale: Some tumors, particularly small-
m m m m
cell lung carcinoma, can produce ectopic ADH. Excess ADH causes water retentio
m m m m m m m m m m m
n, dilutional hyponatremia, and inappropriately concentrated urine.
m m m m m m
Question 6. A patient with a rapidly growing tumor has elevated serum uric acid,
m m m m m m m m m m m m m
mpotassium, and phosphate after chemotherapy. Which complication is most likel
m m m m m m m m m
y?
A. Tumor lysis syndrome
m m m
B. Iron-deficiency anemia
m m
C. Nephrotic syndrome
m m
D. Primary hypothyroidism
m m
Correct Answer: A. Tumor lysis syndrome
m m m m m
Rationale: Rapid tumor- m m
cell destruction releases intracellular potassium, phosphate, and nucleic acids. P
m m m m m m m m m
urine breakdown increases uric acid, and these changes can cause acute kidney i
m m m m m m m m m m m m
njury and dangerous electrolyte abnormalities.
m m m m
Question 7. Which mechanism explains the elevated risk of tumor lysis syndrom
m m m m m m m m m m m
e in patients with high tumor burden?
m m m m m m
A. Large numbers of malignant cells release intracellular contents when destroye
m m m m m m m m m m
d
B. Reduced tumor-cell turnover
m m m
C. Increased renal clearance of uric acid
m m m m m m
D. Increased serum calcium after every chemotherapy dose
m m m m m m m
Correct Answer: A. Large numbers of malignant cells release intracellular content
m m m m m m m m m m
s when destroyed
m m
Rationale: A high tumor burden means many cells may undergo rapid destructio
m m m m m m m m m m m
n during treatment. The resulting release of intracellular electrolytes and nucleic
m m m m m m m m m m
macids can overwhelm normal metabolic and renal clearance mechanisms.
m m m m m m m m
Question 8. A patient has a malignancy with loss of E-
m m m m m m m m m m
cadherin expression. Which process may be promoted?
m m m m m m
, A. Reduced cellular adhesion and increased invasion
m m m m m m
B. Increased normal epithelial attachment
m m m m
C. Complete suppression of metastasis
m m m m
D. Increased DNA repair accuracy
m m m m
Correct Answer: A. Reduced cellular adhesion and increased invasion
m m m m m m m m
Rationale: E- m
cadherin helps maintain adhesion between epithelial cells. Reduced expression c
m m m m m m m m m
an facilitate detachment and invasion, contributing to malignant progression.
m m m m m m m m
Question 9. A patient with chronic inflammation has elevated C-
m m m m m m m m m
reactive protein. Which statement best describes CRP?
m m m m m m
A. It is an acute-phase protein produced mainly by the liver
m m m m m m m m m m
B. It is a thyroid hormone
m m m m m
C. It is produced exclusively by red blood cells
m m m m m m m m
D. It directly measures kidney filtration
m m m m m
Correct Answer: A. It is an acute-phase protein produced mainly by the liver
m m m m m m m m m m m m
Rationale: CRP is produced by the liver in response to inflammatory cytokines, p
m m m m m m m m m m m m
articularly IL-6. It is a nonspecific marker of systemic inflammation.
m m m m m m m m m
Question 10. A patient develops widespread tissue injury after restoration of blo
m m m m m m m m m m m
od flow to an ischemic organ. Which process is most likely involved?
m m m m m m m m m m m
A. Ischemia-reperfusion injury
m m
B. Physiologic hypertrophy
m m
C. Normal cellular differentiation
m m m
D. Reduced oxidative stress
m m m
Correct Answer: A. Ischemia-reperfusion injury
m m m m
Rationale: Reperfusion can restore oxygen but also generate reactive oxygen spe
m m m m m m m m m m
cies, activate inflammatory pathways, and produce calcium-
m m m m m m
related injury. These processes may worsen tissue damage after ischemia.
m m m m m m m m m
APPLIED PATHOPHYSIOLOGY
100 Questions | Six Sections | Clinical Scenarios | Answers and Detailed Rationales
SECTION 1: Complex Cellular, Inflammatory, and Oncologic Disorders (Question
m m m m m m m m
s 1–20)
m
Question 1. A patient receiving chemotherapy develops severe neutropenia. Whi
m m m m m m m m m
ch complication is the greatest immediate concern?
m m m m m m
A. Opportunistic infection
m m
B. Hypercalcemia
m
C. Increased blood viscosity
m m m
D. Excessive erythrocyte production
m m m
Correct Answer: A. Opportunistic infection
m m m m
Rationale: Neutrophils are essential for defense against bacterial and fungal infec
m m m m m m m m m m
tions. Severe neutropenia substantially increases infection risk, and fever may be
m m m m m m m m m m
mthe only early sign of a serious infection.
m m m m m m m
Question 2. A patient has a malignancy that produces excess parathyroid hormo
m m m m m m m m m m m
ne-related peptide (PTHrP). Which metabolic abnormality is most likely?
m m m m m m m m
A. Hypercalcemia
m
B. Hypocalcemia
m
C. Severe hypoglycemia
m m
D. Hypernatremia
m
Correct Answer: A. Hypercalcemia
m m m
Rationale: PTHrP can mimic some actions of parathyroid hormone, increasing bo
m m m m m m m m m m
ne resorption and renal calcium retention. Certain malignancies produce PTHrP,
m m m m m m m m m m
causing humoral hypercalcemia of malignancy.
m m m m
Question 3. A patient has a tumor with a high Ki-
m m m m m m m m m m
67 proliferation index. What does this indicate?
m m m m m m
,A. A high proportion of actively proliferating tumor cells
m m m m m m m m
B. Complete absence of cell division
m m m m m
C. Normal tissue differentiation
m m m
D. Absence of malignant potential
m m m m
Correct Answer: A. A high proportion of actively proliferating tumor cells
m m m m m m m m m m
Rationale: Ki- m
67 is a marker of cellular proliferation. A higher index indicates that a greater pr
m m m m m m m m m m m m m m
oportion of tumor cells are cycling, although its prognostic meaning depends on
m m m m m m m m m m m m
the tumor type.
m m
Question 4. A patient with a chronic wound develops a malignant tumor arising f
m m m m m m m m m m m m m
rom the epithelial lining. Which cancer classification applies?
m m m m m m m
A. Carcinoma
m
B. Sarcoma
m
C. Lymphoma
m
D. Myeloma
m
Correct Answer: A. Carcinoma
m m m
Rationale: Carcinomas arise from epithelial cells. Sarcomas arise from mesenchy
m m m m m m m m m
mal tissues, lymphomas from lymphoid cells, and myelomas from plasma cells.
m m m m m m m m m m
Question 5. A patient with cancer develops unexplained hyponatremia due to tu
m m m m m m m m m m m
mor secretion of antidiuretic hormone. Which paraneoplastic condition is presen
m m m m m m m m m
t?
A. SIADH
m
B. Diabetes insipidus
m m
C. Primary hyperaldosteronism
m m
D. Cushing syndrome
m m
Correct Answer: A. SIADH
m m m
,Rationale: Some tumors, particularly small-
m m m m
cell lung carcinoma, can produce ectopic ADH. Excess ADH causes water retentio
m m m m m m m m m m m
n, dilutional hyponatremia, and inappropriately concentrated urine.
m m m m m m
Question 6. A patient with a rapidly growing tumor has elevated serum uric acid,
m m m m m m m m m m m m m
mpotassium, and phosphate after chemotherapy. Which complication is most likel
m m m m m m m m m
y?
A. Tumor lysis syndrome
m m m
B. Iron-deficiency anemia
m m
C. Nephrotic syndrome
m m
D. Primary hypothyroidism
m m
Correct Answer: A. Tumor lysis syndrome
m m m m m
Rationale: Rapid tumor- m m
cell destruction releases intracellular potassium, phosphate, and nucleic acids. P
m m m m m m m m m
urine breakdown increases uric acid, and these changes can cause acute kidney i
m m m m m m m m m m m m
njury and dangerous electrolyte abnormalities.
m m m m
Question 7. Which mechanism explains the elevated risk of tumor lysis syndrom
m m m m m m m m m m m
e in patients with high tumor burden?
m m m m m m
A. Large numbers of malignant cells release intracellular contents when destroye
m m m m m m m m m m
d
B. Reduced tumor-cell turnover
m m m
C. Increased renal clearance of uric acid
m m m m m m
D. Increased serum calcium after every chemotherapy dose
m m m m m m m
Correct Answer: A. Large numbers of malignant cells release intracellular content
m m m m m m m m m m
s when destroyed
m m
Rationale: A high tumor burden means many cells may undergo rapid destructio
m m m m m m m m m m m
n during treatment. The resulting release of intracellular electrolytes and nucleic
m m m m m m m m m m
macids can overwhelm normal metabolic and renal clearance mechanisms.
m m m m m m m m
Question 8. A patient has a malignancy with loss of E-
m m m m m m m m m m
cadherin expression. Which process may be promoted?
m m m m m m
, A. Reduced cellular adhesion and increased invasion
m m m m m m
B. Increased normal epithelial attachment
m m m m
C. Complete suppression of metastasis
m m m m
D. Increased DNA repair accuracy
m m m m
Correct Answer: A. Reduced cellular adhesion and increased invasion
m m m m m m m m
Rationale: E- m
cadherin helps maintain adhesion between epithelial cells. Reduced expression c
m m m m m m m m m
an facilitate detachment and invasion, contributing to malignant progression.
m m m m m m m m
Question 9. A patient with chronic inflammation has elevated C-
m m m m m m m m m
reactive protein. Which statement best describes CRP?
m m m m m m
A. It is an acute-phase protein produced mainly by the liver
m m m m m m m m m m
B. It is a thyroid hormone
m m m m m
C. It is produced exclusively by red blood cells
m m m m m m m m
D. It directly measures kidney filtration
m m m m m
Correct Answer: A. It is an acute-phase protein produced mainly by the liver
m m m m m m m m m m m m
Rationale: CRP is produced by the liver in response to inflammatory cytokines, p
m m m m m m m m m m m m
articularly IL-6. It is a nonspecific marker of systemic inflammation.
m m m m m m m m m
Question 10. A patient develops widespread tissue injury after restoration of blo
m m m m m m m m m m m
od flow to an ischemic organ. Which process is most likely involved?
m m m m m m m m m m m
A. Ischemia-reperfusion injury
m m
B. Physiologic hypertrophy
m m
C. Normal cellular differentiation
m m m
D. Reduced oxidative stress
m m m
Correct Answer: A. Ischemia-reperfusion injury
m m m m
Rationale: Reperfusion can restore oxygen but also generate reactive oxygen spe
m m m m m m m m m m
cies, activate inflammatory pathways, and produce calcium-
m m m m m m
related injury. These processes may worsen tissue damage after ischemia.
m m m m m m m m m
