Cook spaghetti according to package directions; drain. Meanwhile, in a large skillet, heat butter over medium-high heat. Add mushrooms, celery and onion; cook and stir 6-8 minutes or until mushrooms are tender., Add cream cheese and broth; cook, uncovered, over low heat 4-6 minutes or until blended, stirring occasionally. Add turkey, pimientos, salt and spaghetti; heat through, tossing to coat. Serve with Parmesan cheese.