Clinical and radiographic records during the treatment. (A) Plentiful errhysis originating from the pulp chamber during and after accessing the cavity. (B) 3% hydrogen peroxide along with bloody pus leaking from the extra-oral drainage sinus during irrigation. (C) Working length determination. (D) Floor of the pulp chamber showing four orifices after preparation. (E) The root canals were packed with Vitapex after preparation. (F) The resolution of the sinus tract after dressing for one month.