What's the name of this posture and what's the most likely diagnosis? I'll post the correct answer in a couple of days!
Correct answer: Question mark posture, as seen in ankylosing spondylitis. A chronic inflammatory disease of the spine and sacroiliac joints, of unknown etiology. The typical patient is a man <30 years old with gradual onset of low back pain, worse at night, with spinal morning stiffness relieved by exercise. In a few, there's progression to kyphosis (question mark posture) and spino-cranial ankylosis. Over 95% of the patients is HLA B27 +ve. I realize now that the mask is misleading, I should've said it was unrelated to the condition.