Congenital kyphoscoliosis is an uncommon spinal deformity with potential for rapid progression, resulting in severe deformity and possible neurological deficits. In the past, treatment has focused on prevention of deformity progression in growing children. Little has been written about congenital kyphoscoliosis presenting in adulthood. The aging spine is rigid, and hemivertebrae often present with local segmental kyphoscoliotic alignment. Traditionally, hemivertebral excision has been conducted through a combined anterior and posterior approach. The case reported here was treated with posterior transpedicular lateral extracavitary excision of a thoracic, fully segmented hemivertebra. The use of the cantilever bending technique achieved satisfactory correction, and no neurological complications were observed. The patient was thus spared a thoracotomy, and no chest tube was required.