Introduction
Lattice degenerations are oval/round/linear areas of retinal thinning with adjacent vitreoretinal adhesion anomalies.
- Has a classic circumferential shape in the peripheral retina
- Commonly associated with RPE hyperplasia, leading to associated pigmentation.
- Temporal location most common --> associated with central retinal thinning and anomalous VR adhesion at lesion edges.
- Affects 7-10% of the population and is usually bilateral
- Approximately 20-30% of patients with RRD have lattice degeneration
Snail Track Degenerations:
- Variant of lattice degeneration, sometimes hypothesized to be early stage lattice degeneration.
Dead Giveaways
Fundus Appearance:
Is characterised by the classic web-like structure due to sclerosed ghost vessels
From the Retinal Centre of San Diego. Sclerosed vessels form a lattice appearance, very typical in lattice degeneration. 
Snail Track Degeneration. Whilst still circumferential, lacks the sclerosed vessel networks. Additionally, some atrophic holes may be seen, which can also manifest in lattice degeneration.
OCT Appearance:
On the OCT, will have a U-shaped vitroretinal traction, which can sometimes manifest with hyper-reflective dots. The hyper-reflective dots, if they manifest are thought to be changes in the cell morphology and adherent vitreous gel.
Tsai C.Y. et al. 2019. Shows the U-shaped traction, with subclinical tractional retinal detachments, with potential spaces. This is also known as tractional linear retinal tears. RRD may follow
diagnostic features
Other Features:
Can manifest with internal holes, or retinal tears
The holes can be atrophic holes of full thickness, and can also begin to tear. Refer to images above for examples.