CERTIFIED MULTIPLE SCLEROSIS SPECIALIST EXAM PREP (CMSC) WITH
COMPLETE SOLUTIONS
MULTIPLE SCLEROSIS
Q1. Which immune cells play the most significant role in the pathogenesis of multiple
sclerosis?
A. Neutrophils
B. B lymphocytes and T lymphocytes
C. Eosinophils
D. Natural killer cells
Correct Answer: B
Explanation:
MS is an immune-mediated inflammatory disease primarily driven by autoreactive T cells
(especially CD4+ Th1 and Th17) and B cells, which contribute through antibody production,
antigen presentation, and cytokine release. This understanding explains why B-cell–depleting
therapies (e.g., ocrelizumab) are effective.
Q2. Which factor is MOST strongly associated with increased MS risk?
A. High vitamin D levels
B. Childhood exposure to EBV
C. Female sex
D. Smoking
Correct Answer: B
Explanation:
Almost 100% of people with MS have evidence of prior EBV infection. EBV is considered
one of the strongest environmental risk factors, likely triggering autoimmune mechanisms via
molecular mimicry.
Domain 2: Clinical Presentation & Diagnosis
Q3. A patient presents with unilateral optic neuritis, pain with eye movement, and
decreased color vision. What is the MOST likely diagnosis?
A. Ischemic optic neuropathy
B. Neuromyelitis optica
, C. Multiple sclerosis
D. Acute glaucoma
Correct Answer: C
Explanation:
Optic neuritis with pain on eye movement and color desaturation is classic for MS, especially
in younger adults. NMO typically presents with bilateral or severe optic neuritis.
Q4. According to the McDonald Criteria, dissemination in time can be demonstrated by:
A. Two clinical attacks
B. New T2 lesion on follow-up MRI
C. Elevated ESR
D. Positive ANA
Correct Answer: B
Explanation:
Dissemination in time is shown by:
A new MRI lesion on follow-up
Simultaneous enhancing and non-enhancing lesions
CSF-specific oligoclonal bands
Q5. Which CSF finding supports a diagnosis of MS?
A. Elevated protein >200 mg/dL
B. Neutrophilic pleocytosis
C. Oligoclonal bands unique to CSF
D. Low glucose
Correct Answer: C
Explanation:
Oligoclonal IgG bands in CSF but not serum reflect intrathecal antibody production and are
present in ~95% of MS patients.
Domain 3: MS Disease Courses
COMPLETE SOLUTIONS
MULTIPLE SCLEROSIS
Q1. Which immune cells play the most significant role in the pathogenesis of multiple
sclerosis?
A. Neutrophils
B. B lymphocytes and T lymphocytes
C. Eosinophils
D. Natural killer cells
Correct Answer: B
Explanation:
MS is an immune-mediated inflammatory disease primarily driven by autoreactive T cells
(especially CD4+ Th1 and Th17) and B cells, which contribute through antibody production,
antigen presentation, and cytokine release. This understanding explains why B-cell–depleting
therapies (e.g., ocrelizumab) are effective.
Q2. Which factor is MOST strongly associated with increased MS risk?
A. High vitamin D levels
B. Childhood exposure to EBV
C. Female sex
D. Smoking
Correct Answer: B
Explanation:
Almost 100% of people with MS have evidence of prior EBV infection. EBV is considered
one of the strongest environmental risk factors, likely triggering autoimmune mechanisms via
molecular mimicry.
Domain 2: Clinical Presentation & Diagnosis
Q3. A patient presents with unilateral optic neuritis, pain with eye movement, and
decreased color vision. What is the MOST likely diagnosis?
A. Ischemic optic neuropathy
B. Neuromyelitis optica
, C. Multiple sclerosis
D. Acute glaucoma
Correct Answer: C
Explanation:
Optic neuritis with pain on eye movement and color desaturation is classic for MS, especially
in younger adults. NMO typically presents with bilateral or severe optic neuritis.
Q4. According to the McDonald Criteria, dissemination in time can be demonstrated by:
A. Two clinical attacks
B. New T2 lesion on follow-up MRI
C. Elevated ESR
D. Positive ANA
Correct Answer: B
Explanation:
Dissemination in time is shown by:
A new MRI lesion on follow-up
Simultaneous enhancing and non-enhancing lesions
CSF-specific oligoclonal bands
Q5. Which CSF finding supports a diagnosis of MS?
A. Elevated protein >200 mg/dL
B. Neutrophilic pleocytosis
C. Oligoclonal bands unique to CSF
D. Low glucose
Correct Answer: C
Explanation:
Oligoclonal IgG bands in CSF but not serum reflect intrathecal antibody production and are
present in ~95% of MS patients.
Domain 3: MS Disease Courses
