A 28-year-old female reported to our hospital with a painful, bony swelling lesion in the front teeth region of her lower jaw. She had undergone a biopsy of the lesion elsewhere which proved to be aneurismal bone cyst. A 3D CT scan revealed the exact size and extent of the lesion in the anterior mandibular region. Maxillofacial Surgeon Dr. S.M. Balaji successfully performed a complete resection and reconstruction. A radical excision of the lesion was done with complete resection of all tissues lining the cyst and any of its components from the surrounding soft tissues. The involved teeth were also extracted. To reconstruct the residual defect, a graft from iliac crest was harvested using trapdoor technique. The harvested graft was used to reconstruct the residual mandibular defect. The surgical site was sutured. The patient was happy that the lesion was excised and jaw bone was reconstructed successfully.