.intralumenal growth pattern- often resulting in distal atelectasis or post-obstructive pneumonitis (a non-infectious process). .the lowest frequency of distant metastases,spreads to involve local nodes by direct extension .the most favorable prognosis Hypertrophic osteoarthropathyintralumenal growth pattern￾often resulting in distal atelectasis or post-obstructive pneumonitis (a non-infectious process). the lowest frequency of distant metastases, spreads to involve local nodes by direct extension the most favorable prognosis Hypertrophic osteoarthropathy