case_images: PMC11392865_01
case_images: (A) Broad line fundus imaging showed a round, pigmented cyst. (B) Ultrasound B-scan showed the posterior-located vitreous cyst. (C) Spectral-domain OCT (SD-OCT) showed an image of a cyst with an inverse line. Red arrow: High-reflectivity band corresponds to the posterior edge of the vitreous cyst. Green arrow: The reflection image formed by exceeding the SD-OCT upper limit. (D) Ultra-wide field swept-source optical coherence tomography (SS-OCT), with 9 mm scan depth and 12 mm scan length, demonstrated a complete cyst image (3.5 mm x 3.2 mm in size) with a hyper-reflective enclosure, hypo-reflective content, and shadowing of the underlying retina.
case_images: fmed-11-1428353-g001.jpg
case_images: PMC11392865_01_fmed-11-1428353-g001.jpg
case_images: fig1
case_images: The broad line fundus imaging (CLARUS 500 ; Carl Zeiss Meditec AG, Jena, Germany) showed a more clearly pigmented free-floating vitreous cyst with a defined boundary, spherical with small protrusions, located close to the mid-periphery retina (Figure 1A). However, it was difficult to determine whether the cyst adhered to the eyeball wall (Figure 1B). SD-OCT (Figure 1C, Heidelberg Spectrails, Heidelberg, Germany) showed a hyper-reflective shell with hypo-reflective contents. The ultra-wide field SS-OCT (Figure 1D, VG200D; SVision Imaging, Henan, China), with a maximum scanning depth of up to 12 mm, demonstrated a complete oval-shaped, hyper-reflective thin shell filled with a homogeneous hypo-reflective liquid that did not adhere to the retina and shadowing of the underlying retina.