Which statement best differentiates ADEM from multiple sclerosis in children?

Which statement best differentiates ADEM from multiple sclerosis in children?

• A. ADEM is post-infectious/post-vaccination with encephalopathy and monophasic; MS is relapsing.
• B. ADEM is relapsing; MS is monophasic.
• C. ADEM always involves the optic nerve; MS never involves the optic nerve.
• D. ADEM occurs only in adults.

Answer: (A)

The key idea is how the illness pattern and trigger differentiate ADEM from pediatric MS. ADEM typically follows an infection or vaccination and presents with acute encephalopathy (confusion or reduced consciousness) plus demyelinating symptoms, but it is usually a single, monophasic event. Pediatric MS, by contrast, tends to be relapsing-remitting, with separate attacks over time and without the widespread acute encephalopathy that characterizes ADEM. That is why describing ADEM as post-infectious/post-vaccination with encephalopathy and a monophasic course, while MS is relapsing, best captures the difference. The other statements don’t fit: ADEM is not reliably relapsing, optic nerve involvement can occur in MS (and is not exclusive to ADEM), and ADEM does occur in children, not only adults.

The key idea is how the illness pattern and trigger differentiate ADEM from pediatric MS. ADEM typically follows an infection or vaccination and presents with acute encephalopathy (confusion or reduced consciousness) plus demyelinating symptoms, but it is usually a single, monophasic event. Pediatric MS, by contrast, tends to be relapsing-remitting, with separate attacks over time and without the widespread acute encephalopathy that characterizes ADEM.

That is why describing ADEM as post-infectious/post-vaccination with encephalopathy and a monophasic course, while MS is relapsing, best captures the difference. The other statements don’t fit: ADEM is not reliably relapsing, optic nerve involvement can occur in MS (and is not exclusive to ADEM), and ADEM does occur in children, not only adults.