Place the romaine and dressing in a bowl and gently toss to combine. Divide and place salad down the centre of each tortilla. Arrange the shrimp in a row alongside the lettuce. Sprinkle with Parmesan cheese. Fold the sides of the tortilla partially over the filling and then roll up. Cut in half at a slight angle and arrange on plates. If desired, serve the additional Caesar salad dressing alongside for dipping.