Idiopathic Scoliosis: This is the most common cause of spinal curvature, especially in adolescents and young adults. The presence of a left curvature of the thoracic and lumbar spine with a Cobb angle of 36 degrees is consistent with this diagnosis. The lack of a rotational component does not rule out idiopathic scoliosis.

Degenerative Scoliosis: This condition typically occurs in older adults and is caused by degenerative changes in the spine, such as osteoarthritis or disc degeneration. The curvature can be progressive and may cause symptoms such as back pain or radiculopathy.
Congenital Scoliosis: This condition is present at birth and can be caused by abnormalities in the development of the spine. The curvature can be progressive and may require surgical intervention.
Scoliosis due to Neuromuscular Disease: Certain neuromuscular diseases, such as muscular dystrophy or cerebral palsy, can cause scoliosis due to muscle weakness or imbalance.

Spinal Tumor or Infection: A spinal tumor or infection, such as osteomyelitis or a spinal abscess, can cause curvature of the spine. These conditions can be life-threatening if not promptly diagnosed and treated.
Osteogenesis Imperfecta: This genetic disorder can cause brittle bones and scoliosis. It is essential to consider this diagnosis in patients with a family history of the condition.
Ehlers-Danlos Syndrome: This genetic disorder can cause hypermobile joints and scoliosis. It is crucial to consider this diagnosis in patients with a family history of the condition.

Scheuermann's Kyphosis: This condition is a rare cause of spinal curvature, characterized by a kyphotic deformity of the thoracic or thoracolumbar spine.
Marfan Syndrome: This genetic disorder can cause scoliosis, as well as other systemic symptoms such as tall stature, joint hypermobility, and eye abnormalities.
Neurofibromatosis: This genetic disorder can cause scoliosis, as well as other systemic symptoms such as cafe-au-lait spots, neurofibromas, and optic gliomas.