A B-scan ultrasound of a patient with sudden floaters shows a thin, undulating, hyperechoic membrane that inserts into the ora serrata but not the optic disc. On dynamic scanning, it shows high after-movement. This finding is most characteristic of:
- A Total retinal detachment
- B Posterior vitreous detachment ✓
- C Choroidal detachment
- D Vitreous hemorrhage
Correct answer: B. Posterior vitreous detachment
Explanation
A posterior vitreous detachment appears as a thin, undulating, highly mobile membrane that does not insert onto the optic disc. A total retinal detachment inserts onto both the optic disc and ora serrata and has limited mobility. Choroidal detachment appears as a smooth, dome-shaped, non-undulating elevation without disc insertion. Vitreous hemorrhage shows diffuse, low-amplitude vitreous opacities.
Reference: AAO BCSC Section 12: Retina and Vitreous, 2022-2023 ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.