RESULTS: B-scan ultrasonography detected macular thickening with a high degree of sensitivity (91%) and specificity (96%). There was a high degree of agreement between findings on ultrasonography and FA (kappa 0.80). Ultrasonographic diagnosis correlated with OCT measurements for both central macular thickness (r

B-scan ultrasonography (USG) is a simple, noninvasive tool for diagnosing lesions of the posterior segment of the eyeball. Common conditions such as cataract, vitreous degeneration, retinal detachment, ocular trauma, choroidal melanoma, and retinoblastoma can be accurately evaluated with this modality.

The B-scan provides visualization of ocular structures when direct visualization is not possible due to media and/or structural anomalies. When intraocular structures can be seen, the use of the B-scan allows clinicians to differentiate ocular findings that may otherwise appear similarly on other modes of ancillary imaging.

Longitudinal macular scan in an eye with macular edema. The optic nerve shadow is seen at the bottom of the right side of the scan, with the macula just above. The probe is held on...

B-scan can be particularly useful in dif­ferentiating between optic disc drusen (ODD) and papilledema, conditions that are often confused on direct ex­amination. Calcified ODD will be seen as highly reflective elevated foci at the optic nerve head .