Juxta-articular myxoma and intramuscular myxoma are two distinct entities. Activating Gs alpha mutation at Arg 201 codon does not occur in juxta-articular myxoma.

Abstract excerpt

Juxta-articular myxoma is a rare myxoid tumor of soft tissue that bears a close histologic resemblance to intramuscular myxoma but is distinguished from the latter by its clinical setting and behavior. Activating missense mutations at the Arg 201 codon of the Gs alpha gene ultimately leading to increased levels of cyclic adenosine monophosphate have been implicated in McCune-Albright syndrome and sporadic fibrous...

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