DermNet provides Google Translate, a free machine translation service. Note that this may not provide an exact translation in all languages
Home Topics A–Z Lipoid proteinosis pathology
Author: Assoc Prof Patrick Emanuel, Dermatopathologist, Auckland, New Zealand, 2013.
Lipoid proteinosis is a rare autosomal recessive disease caused by mutations in the extracellular matrix protein 1 gene (ECM1).
In lipoid proteinosis, sections show deposition of an eosinophilic homogenous material in the dermis (figures 1, 2). The overlying epidermis may be papillomatous (figure 1). The material surrounds blood vessels and adnexa (figure 2).
Lipoid proteinosis pathology
The eosinophilic material is strongly positive with PAS and weakly positive or negative for congo red and thioflavine-T.
Colloid milium and amyloidosis – Both these conditions show accumulation of a similar eosinophilic material. These should both be congo red positive. Clinical history can be helpful to exclude colloid milium. Immunohistochemical studies for keratin and other amyloid-associated proteins can be helpful if amyloidosis is suspected.
Books about skin diseases
© 2022 DermNet New Zealand Trust.
DermNet NZ does not provide an online consultation service. If you have any concerns with your skin or its treatment, see a dermatologist for advice.