Senile calcific scleral plaques

Senile calcific scleral plaques are benign scleral degenerations common in elderly individuals. They are a common incidental finding on orbital imaging.

Epidemiology

PrevalenceThe prevalence of senile scleral calcific plaques increases with advancing age - approximately 2age, from ~2-3% at age 60, andto 25% agedat age 80 years and over ^1,2.^(1,2) They They may be more prominent in women than men.

There are no known systemic associations ³.⁽³⁾

Clinical presentation

Senile calcific plaques appear clinically as flat, well-circumscribed, ovoid scleral patches. Plaques may appear translucent-blue (due to scleral dehydration and exposure of the underlying uvea), or an opaque grey-white (with further(due to calcification). Approximate dimensions are 2mm2 mm horizontal, 6mm6 mm vertical.

Senile scleral plaques are commonly bilateral and are located in the interpalpebral fissure, 2-3mm posterior to the limbus, and anterior to the insertion of the medial and lateral recti. Plaques involving the vertical muscle insertions are very rare^4,5.^(4,5)

Scleral plaques do not produce symptoms. There are rare reports of extrusion ⁴.⁽⁴⁾

Pathology

TheAlthough the precise aetiology is unknown, calcified senile scleral plaques are considered to represent a form of dystrophic calcification, similar to that which occurs in other parts of the body in areas of hyaline degeneration ⁶. Various proposed causes include mechanical stress from the rectus muscle insertions, dehydration, and actinic (solar) damage⁵.⁽⁵⁾

Histologic tissue sections demonstrateHistolopathologic evaluation demonstrates calcific deposits within the scleral stroma. These varyrange from fine granular deposits to the confluent plaques (as visiblewhich are apparent on imaging). Various staining methods can confirm the presence of calcium, including von Kossa and Alizarin Red stains. Senile calcific plaques were previously thought to represent focal hyalinization of the sclera; however, this is not the casehas been shown to be false ^3,4.^(3,4)

Radiographic features

If sufficiently dense, senile calcific scleral plaques will be visualised on orbital imaging.

Computed Tomography

CT appearances are ofScleral plaques appear as small ovoid calcifications on bony windowsalong the anterior globe, with stereotypical size and locationtypically anterior to the horizontal insertion of the rectus muscles ^1-3.^(1,3)

Ultrasound

Ultrasound mayMay show anterior shadowing typical of calcified lesions ^6.(6)

Optical Coherence Tomography

Senile scleral plaques are hyporeflective on OCT, with hyperreflective calcifications.

Treatment and prognosis

No treatment is required.

Differential diagnosis

When noted incidentally, clinical correlation should confirm absenceAlthough scleral calcification may occur in the setting of a foreign body if appearancesinflammation, lymphoma, and hypercalcemic states, senile scleral calcifications are generally considered "do not typicaltouch" lesions given their commonality stereotypical appearance.

A number of other conditions cause calcification of the globe. However, the typical appearance

• foreign body
  • atypical shape or location of multiple calcific classification
  • should recommend clinical correlation with physical/ophthalmologic evaluation
• scleral plaques in this location is pathognomonic. Scleral bucklesbuckle have a
  • distinct appearance, often encircling, are located more posteriorly, and are placed between the muscle and the globe.

    Clinically, senile scleral plaques must be distinguished from

• scleromalacia perforans (progressive(rare)
  • progressive thinning occurring in younger patients), and
• other pigmented ocular surface lesions.

See also

Calcification of the globe (differential)