A case of difficult decannulation due to non radio opaque foreign body (fish bone) left bronchus is presented because of its rare combination with diptheria which often calls for tracheostomy in children. Various factors of decannulation panic are discussed. Where there is no obvious obstruction such as the original condition. Granulation tissue and scar tissue, odema, thick mucus, crusts, tracheomalacia and displacement of tracheal flap, a non radioopaque F.B. causing incomplete obstruction should be thought of. © 1974 Association of Otolaryngologists of India.