Fig. 65.

Optical coherence tomography (OCT) findings of perivascular infiltration before and after treatment. Along each row of images, the left panel shows an infrared scanning laser ophthalmoscopic image showing the scan location, the middle panel shows the entire OCT scan, and the right panel shows a highlighted area as demarcated by the white rectangle in the middle panel. (A) Horizontal OCT section through an involved segment of the superotemporal arcade vein. There is an annular zone of increased perivascular reflectivity (arrowheads) around a vein (arrow). Adjacent to this is a region of loss of the laminations of the retina (double arrow). Contained within this region is a zone of increased reflectivity of the inner nuclear layer. It is possible this could be called paracentral acute middle maculopathy, but this term ignores the associated changes in other layers of the retina and the area imaged is not within the anatomic macula. (B) A scan perpendicular to that shown in (A) shows the variable thickening of the retina in the region of loss of laminations. Note the focal area of thinning (blue arrow). The choroid shows increased reflectivity and a loss of visible structure. (C) One week after intravitreal triamcinolone the retina shows thinning in the region of the double arrow. The perivascular reflectivity is thinner (arrowheads) around the retinal vein (arrow). (D) An OCT scan taken perpendicular to (C) shows the thinning