A 48-year-old female presents to clinic with complaints of back pain that has been ongoing for about 3 months. The patient states that the pain started after moving around some heavy boxes in her garage. She has tried ice and over-the-counter medications with only mild relief of her symptoms. Osteopathic structural examination reveals the right transverse process of T9 to be more posterior than the left. The rotational asymmetry does not change with positional changes. Which of the following is the most likely diagnosis?