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Are there any symptoms associated with this tumor?
The tumor itself is not painful but I am having trouble with pain and stiffness in my hip and also that leg.
It is very likely that you have a lipoma , that is fat containing tumor.Such tumor are generally harmless.
You can see a surgeon to get it removed.
I asked my ob/gyn about it two (2) times when it was small and she advised me to ignore it because removing it would be painful and leave scar tissue. It has since grown very large.
I dont think removal of this tumor can affect horse riding.
Yes, most doctor don't advise removal of such tumor since they are harmless.
Would an MRI show if there was any nerve or muscle involvement?
Only their size can cause symptoms and in such cases they need to be removed.
Yes, MRI would be ideal investigation to know the involvement.
Is there a specialist I should contact?
A general surgeon can easily handle this.
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OK, thank you very much.