Post and core with first molar

Post and core with first molar : - 

This the RVG of the female patient age 23 years giving history of hemisection with post and core with lower left first molar one and half year ago .Now she is having pain and swelling clinically . Radigraphically there is periapical abscess seen with distal canal which  is not obturated in middle and apical third .Probably the same tooth will for the extraction after working for one and half year with sacrifice of  enamel of adjacent molar for additional support .