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Primary Lateral Sclerosis

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Question: Why would hyper reflexes turn to hypo reflexes in Primary Lateral Sclerosis, after 8 yrs? Possibly ALSvsPLS? One neuro says it can't be PLS anymore, after saying it is a perfect case of PLS in 2004. Says he's puzzled. I have speech and foot drop issues, have a baclofen pump.

Answer: PLS should not have that conversion. However, PLS sometimes evolves to a more ALS picture so losing reflexes in very weak muscles might make sense with that conversion (meaning it is now ALS). Some argue that PLS is just a particular rare form of onset of ALS. Of course, with these exceedingly rare diseases one should keep an open mind as the diagnosis is tenuous. The duration of your illness may also argue a bit for other diagnoses but the PLS picture can be sustained longer than the typical ALS one.


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