Is there a way to simplify this case statement?

I have this PHP case statement

switch ($parts[count($parts) - 1]) {
    case 'restaurant_pos':
        include($_SERVER['DOCUMENT_ROOT'] . '/pages/restaurant_pos.php');
        break;
    case 'retail_pos':
    include($_SERVER['DOCUMENT_ROOT'] . '/pages/retail_pos.php');
        break;  
    .....

}

Which works great but I have many many files (like 190) and I would love to know if there is a way to make this case statement many work with anything so I dont have to do 190 case conditions. I was thinking I can use the condtion in the case and maybe see if that file is present and if so then display and if not then maybe a 404 page but i was not sure a good way to do this...any ideas would help alot