Cook pasta according to package directions, omitting salt and fat. Drain; return to pan. Stir in spinach; toss until spinach wilts. Set aside.
Melt 1 tablespoon butter in a large nonstick skillet over medium-high heat. Add mushrooms, and cook, stirring occasionally, 8 minutes or until browned. Add onion, and sauté over medium heat 10 minutes or until tender. Add garlic; sauté 1 minute.
Stir in chicken broth and white wine. Increase heat to medium-high, and cook, stirring often, 8 minutes or until mixture thickens slightly. Reduce heat to medium. Stir in cream cheese and next 3 ingredients until smooth. Add shrimp, and cook until thoroughly heated. Pour shrimp mixture over pasta mixture; toss to combine. Sprinkle evenly with grated Parmesan cheese, and serve immediately.
*1/4 cup reduced-sodium chicken broth may be substituted.