Veil of obscuration sign (shoulder)
Veil of obscuration sign is a sign of posterior shoulder dislocation. It is generally seen on AP radiographs depicting a comminuted fracture of lesser tuberosity that projects over the glenohumeral joint giving rise to a "cloud-like" density or "veil of bone" density, which hides a posterior shoulder dislocation.
Veil of obscuration sign seen in up to 40% of the patients who present with posterior shoulder dislocation 1.
Fracture fragments of the lesser tuberosity are typically inferior and medially displaced, appear on plain radiographs as flat or disc-like shape.
Lesser tuberosity fracture fragments are nicely seen on CT images with 2D and 3D reformats.
- 1. Hirai Gimber L, Taljanovic MS, Rockov ZA, et al. The Veil of Obscuration: Additional Radiographic Sign of Posterior Shoulder Dislocation. (2018) Acta medica academica. 47 (2): 165-175. doi:10.5644/ama2006-124.228 - Pubmed
- 2. The “Mouzopoulos” sign: a radiographic sign of posterior shoulder dislocation. (2010) Emergency Radiology. 17 (4): 317. doi:10.1007/s10140-010-0862-2 - Pubmed
- 3. Zinon T. Kokkalis, Ilias D. Iliopoulos, Georgia Antoniou, et al. Posterior shoulder fracture–dislocation: an update with treatment algorithm. (2017) European Journal of Orthopaedic Surgery & Traumatology. 27 (3): 285. doi:10.1007/s00590-016-1840-5 - Pubmed
- 4. Doehrmann R, Doehrmann FT, Doehrmann. Posterior Shoulder Instability. (2020) . doi: - Pubmed