SCALA: Find the previous and next elements of an item in a list

PrevNext.scala

def getPrevAndNext[A](lst: List[A], el: A): Option[(Option[A], A, Option[A])] = {
    lst match {
      case Nil => None
      case x :: Nil if x == el => Some(None, x, None)
      case _ :: Nil => None
      case x :: y :: Nil if x == el => Some(None, x, Some(y))
      case x :: y :: Nil if y == el => Some(Some(x), y, None)
      case x :: y :: z :: zs if x == el => Some(None, x, Some(y))
      case x :: y :: z :: zs if y == el => Some(Some(x), y, Some(z))
      case _ => getPrevAndNext(lst.tail, el)
    }
 }