We have reported rare case of tubercular aortic aneurysm which has developed as complication of spinal tuberculosis. Imaging of patient is available prior to starting of antitubercular treatment which showed vertebral tuberculosis with absence of aortic aneurysm. However, patient defaulted on treatment after taking antitubercular chemotherapy only for 2 months. Patient again reported after 14 months with chest pain. At this stage, imaging showed progression of spinal tuberculosis with development of pseudoaneurysm in adjacent descending thoracic aorta. This contiguous spread of tuberculosis from spine to aorta may have been prevented if patient had completed complete course of antitubercular therapy with regular follow-ups. Patient of spinal tuberculosis need to be counselled and informed regarding its various complications, so that they remain adhered to antitubercular chemotherapy and timely follow-ups to prevent complications.