Combine meat, eggs, Romano cheese, breadcrumbs, parsley, salt, and pepper; mix well. Shape into a ball, and place on a lightly greased 12-inch pizza pan. Press evenly on bottom and sides of pan.
Cook macaroni according to package directions; drain well. Combine macaroni, 2 table spoons tomato sauce, and mushrooms; spread evenly over meat. Top with remaining tomato sauce.
Brown sausage in a small skillet, stirring to crumble: drain well. Sprinkle sausage evenly over tomato sauce. Top with mozzarella cheese. Bake at 350° for 20 minutes. Cut into wedges to serve.