Edit: I see you mentioned that you ruled out Pediatric stroke (I am not familiar with this,) so that seems to answer my question. hmm...
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If the patient were elderly, just based on the symptoms you described (and I have no medical experience and thus cannot offer more than my own thoughts,) I would suspect a blood clot.
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For example, my elderly grandmother was temporarily unable to talk well, or at all briefly if I remember right. Those symptoms gradually improved after she was taken to the ER. Â After doing some ultrasounds, the doctors found blood clots in both her legs. I believe they called the symptoms a Transient Ischemic Attack [TIA] (a mini-stroke.) They performed surgery to add a filter that was designed to break up and prevent future blood clots.Â
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She seemed to improve relatively quickly once she was in the initial ER. Â I wonder if they gave her some initial medicine or something that helped. I am unsure. I think later they did maybe if anything. I believe it took a day or so for them to perform the surgery because they needed to run the tests to determine the cause.
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She has other elderly health conditions as well. Thus, there could be more than one problem existing here. But that's my shot in the dark. Take it with a grain of salt of course.
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I will pray for improved health for your son.Â