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Before 5 Years. The sphenoid sinuses begins to form at age 2, and are air-filled and visible on X-rays by age 5. The sphenoid sinuses sit behind the eyes and are located deeper than the other sinuses, behind the ethmoid sinuses. The right and left sphenoid are next to each other, only separated by the septum, a thin plate of bone.
Nondisplaced Tear. Fig. 2. Subcortical cysts and posterior capsular stripping in a 16-year-old male who had right shoulder pain when throwing for 3 months. (A) Subcortical cysts (arrow) in the greater tuberosity at the insertion of the supraspinatus tendon are seen as high signal intensity on a fat-suppressed T2-weighted image. (B) Axial gradient echo T2-weighted image shows a nondisplaced tear of the posterior labrum and capsular stripping (arrow). Fig. 3. Posterosuperior labral tear and impaction of the greater tuberosity in a 17-year-old female pitcher who had right shoulder pain and impingement for 5 years.