Which of the following is NOT one of the four main types of Multiple Sclerosis?

The choice of “Progressive-Continuing” is correct as it is not recognized as one of the four main types of Multiple Sclerosis (MS). The established categories are Relapsing-Remitting MS, Secondary Progressive MS, Primary Progressive MS, and Progressive-Relapsing MS.

Relapsing-Remitting MS is characterized by clear episodes of relapse and remission, where new symptoms appear or existing ones worsen, followed by periods of partial or complete recovery.

Secondary Progressive MS begins with a relapsing-remitting course but later transitions into a phase of progressive worsening of neurologic function.

Primary Progressive MS is defined by gradual tissue damage and worsening of function from the onset, without distinct relapses.

Progressive-Continuing does not fit within the confirmed classifications and lacks the clinical characteristics that define the recognized forms of MS. Hence, this choice stands out as incorrect in the context of the standard categorizations of MS.