293. The report of an expert stands in lieu of their testimony. To be admissible, the expert report must have been disclosed to the parties and filed in the record within the time limits for disclosure and filing of evidence. Otherwise, it may be admitted only if it was made available to the parties by another means in a timely manner so that they could react and determine whether the expert’s presence might be useful. It may however be admitted outside such time frames with leave of the court.