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Eye signs in radiology

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Eye signs in radiology

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Eye signs in radiology

  1. 1. EYE SIGNS IN RADIOLOGY -DR. BHAVANA K.
  2. 2. EYE OF THE TIGER SIGN
  3. 3. EYE OF THE TIGER SIGN ■ PKAN (Pantothenate kinase- associated neurodegeneration) Hallervorden-Spatz syndrome ■ The "eye" corresponds to the low signal globus pallidus with the central focus of high signal. The low signal is secondary to the iron deposition.
  4. 4. BULL’S EYE SIGN
  5. 5. BULL’S EYE SIGN  Intussusception  Alternating hypoechoic & hyperechoic concentric rings gives the 'Bull's eye' or target appearance on ultrasound examination.  Submucosa forms hypoechoic ring and mucosa and muscularis propria form echoic rings
  6. 6. RA’S EYE SIGN
  7. 7. RA’S EYE SIGN ■ Sprengel Shoulder ■ On MRI in the sagittal plane, the appearance of the omovertebral band, in association with the peripheral fat tissue, has been termed the 'Ra's eye' sign
  8. 8. SNAKE EYE SIGN
  9. 9. SNAKE EYE SIGN ■ Snake eyes appearance has been described in disorders like compressive myelopathy, ALS, cervical spondylotic amyotrophy, Hirayama disease, and ossification of posterior longitudinal ligament ■ On axials, the gray matter is seen to be oedematous and hyperintense, giving the 'snake eyes' sign.
  10. 10. SNAKE EYE’S SIGN  The facial nerve on coronal CT  Posterior to the genu of the facial nerve, the tympanic and labyrinthine segments are seen as two 'dots' which look like eyes of a snake
  11. 11. FROG EYE SIGN
  12. 12. FROG EYE SIGN ■ Anencephaly on ultrasound ■ On coronal ultrasound, the absence of the calvaria coupled with prominent orbits gives the fetus the 'frog eye' sign
  13. 13. HARLEQUIN EYE SIGN
  14. 14. HARLEQUIN EYE SIGN ■ The harlequin eye deformity may be seen in unilateral or bilateral coronal suture synostosis, and refers to the elevation of the superolateral corner of the orbit.
  15. 15. BLACK EYEBROW SIGN
  16. 16. BLACK EYEBROW SIGN ■ This 'black eye brow' sign signifies an orbital floor or medial wall fracture ■ On plain facial radiograph, lucent intra-orbital air gives the appearance of a black eye brow.
  17. 17. WINKING OWL SIGN
  18. 18. WINKING OWL SIGN ■ The absent pedicle represents the 'winking eye'. ■ The right pedicle is the open eye and the spinous process represents the beak of an owl ■ Destroyed pedicle- spinal metastases, tuberculosis and other infections, primary bone lesions like lymphoma ■ Congenital absence/hypoplasia of a pedicle ■ Neurofibromatosis ■ Radiation therapy

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