Thiel–Behnke dystrophy

Thiel–Behnke dystrophy
Other names: Corneal dystrophy of Bowman layer, type II
Corneal phenotype illustrating TBCD as shown by slit-lamp examination
SpecialtyOphthalmology

Thiel–Behnke dystrophy (Thiel–Behnke corneal dystrophy or TBCD) is a rare form of corneal dystrophy affecting the layer that supports corneal epithelium.The dystrophy was first described in 1967[1] and initially suspected to denote the same entity as the earlier-described Reis-Bucklers dystrophy, but following a study in 1995 by Kuchle et al. the two look-alike dystrophies were deemed separate disorders.[2]

Signs and symptoms

To clarify whether Thiel–Behnke corneal dystrophy is a separate entity from Reis-Bucklers corneal dystrophy, Kuchle et al. (1995) examined 28 corneal specimens with a clinically suspected diagnosis of corneal dystrophy of the Bowman layer by light and electron microscopy and reviewed the literature and concluded that two distinct autosomal dominant corneal dystrophy of Bowman layer (CBD) exist and proposed the designation CDB type I (geographic or 'true' Reis-Bucklers dystrophy) and CDB type II (honeycomb-shaped or Thiel–Behnke dystrophy). Visual loss is significantly greater in CDB I, and recurrences after corneal transplantation seem to be earlier and more extensive in CDB I.[3]

Genetics

Some cases of it are linked to chromosome 10q24, others stem from a mutation in the TGFBI gene.[3]

Diagnosis

The diagnosis can be done via histological examinations, while the differential diagnosis is Reis-Bücklers corneal dystrophy[4]

Management

In terms of the treatment of Thiel-Behnke dystrophy, surgical or eximer laser can be done[4]

See also

References

  1. ↑ Thiel HJ, Behnke H (1967). "[A hitherto unknown subepithelial hereditary corneal dystrophy]". Klin Monatsbl Augenheilkd (in Deutsch). 150 (6): 862–74. PMID 5301630.
  2. ↑ Küchle M, Green WR, Völcker HE, Barraquer J (July 1995). "Reevaluation of corneal dystrophies of Bowman's layer and the anterior stroma (Reis-Bücklers and Thiel–Behnke types): a light and electron microscopic study of eight corneas and a review of the literature". Cornea. 14 (4): 333–54. doi:10.1097/00003226-199507000-00001. PMID 7671605.
  3. 1 2 Online Mendelian Inheritance in Man (OMIM): 602082
  4. 1 2 RESERVED, INSERM US14-- ALL RIGHTS. "Orphanet: Thiel Behnke corneal dystrophy". www.orpha.net. Archived from the original on 28 December 2022. Retrieved 28 December 2022.
Classification

Template:Human corneal dystrophy

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