I would like to ask if any practitioners or instructors have had any experience with treating a child with the above ailment.
Apparently this condition is caused by a mutant gene and there is no known medical cure. I have been asked to treat the child and would love to hear from anyone who has treated a case and if the client did get well.

Hi

I've got a similar condition called heterotopic ossification on my femur. I alternate with Core 2 technics and supercharging ( Unan)and made some progress. It's a tricky thing cause I haven't found a direct way to dissolve the lump. There are days where it is very easy after a session than others where it is playing up.
In your clients case I would use the black hole method of Core 2 but Supercharging and Unan can help too.

all the best

Einar