a turbine assembly includes a shroud for being mounted around a last stage of the low pressure turbine rotor . the shroud includes an arcuate body having spaced - apart forward and aft ends and spaced - apart circumferential ends . attachments are provided for securing the shroud body to the surrounding engine case . an arcuate extension member protrudes rearward from the aft end of the shroud body . the extension member has an inner surface which defines a portion of the gas flowpath through the engine . seals may be provided to prevent leakage between adjacent shroud segments . the shroud is especially useful for protecting a downstream turbine frame from debris and thermal stress .