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Pretibial epidermolysis bullosa: a clinicopathologic study
1Department of Dermatology, National Cheng-Kung University Hospital, Tainan, Taiwan, Republic of China.
Journal of the American Academy of Dermatology
|December 1, 1993
Summary
Pretibial epidermolysis bullosa (PEB) involves the lower legs and is a rare form of dystrophic epidermolysis bullosa (DEB). Anchoring fibril abnormalities are present throughout the skin, not just on the legs, in PEB patients.
Area of Science:
- Dermatology
- Genetics
- Molecular Biology
Background:
- Pretibial epidermolysis bullosa (PEB) is a rare variant of dystrophic epidermolysis bullosa (DEB).
- PEB predominantly affects the skin on the lower legs.
Purpose of the Study:
- To report 19 cases of DEB with pretibial predilection.
- To investigate the characteristics of anchoring fibrils in PEB.
Main Methods:
- Selected patients with blisters and scars primarily on the pretibial area.
- Examined blisters and unaffected skin using light and electron microscopy.
- Quantified anchoring fibrils via morphometry.
Main Results:
- Studied 19 patients from 13 families; inheritance was autosomal dominant in 10 families.
- All patients had nail dystrophy; pruritus was common, with four experiencing extensive prurigo.
- Eight patients had PEB exclusively on legs; others had PEB with albopapuloid or Cockayne-Touraine features.
- Anchoring fibrils were reduced in number and rudimentary in both lesional and non-lesional skin compared to controls.
Conclusions:
- Common ancestry may explain the increased incidence of DEB, particularly PEB, in Tainan, Taiwan.
- Anchoring fibril abnormalities in PEB are not confined to the pretibial area.
- The observed anchoring fibril defects do not differentiate PEB from other DEB subtypes.