Lamellar Ichthyosis Clinical Presentation
- Author: Heather Kiraly Orkwis; Chief Editor: Dirk M Elston, MD more...
Physical
Newborn period
The newborn presents encased in a tough, filmlike membrane that fissures when stretched. This collodion membrane is shed by 10-14 days, revealing generalized erythema and scaling.
Childhood and adulthood
- Skin: The disease is characterized by generalized scales, which range from fine and white to thick, dark, and platelike. The scales are arranged in a mosaic pattern resembling fish skin. The lesions involve the entire body and are increased in flexural surfaces such as the axilla, groin, antecubital fossa, and neck. The individual scales tend to be larger over the legs and, in some areas, are centrally attached and raised at the edges.[5] See the image below.
Keratoderma of the palms in a patient with lamellar ichthyosis. Courtesy of Dirk Elston, MD. - Scalp: Scarring alopecia can result from the overall tightness of skin and the thick stratum corneum entrapping hairs. The hair may be thin and fine but, similar to the nails, can grow at 2-3 times the normal rate.
- Other findings: The lips and mucous membranes tend to be spared. Other associated features are ectropion, eclabium, bilateral conjunctivitis, small and deformed ears, and inflexible digits due to taut skin. See the image below.
Inflexible fingers due to taut skin in a young patient with lamellar ichthyosis. Courtesy of Dirk Elston, MD.
Causes
Lamellar ichthyosis is an autosomal recessive disorder in almost all cases. Genetic linkage studies have been performed on families with classic lamellar ichthyosis and show markers on band 14q11 in the region of the TGM1 gene locus. An autosomal dominant form of lamellar ichthyosis has been described.[6, 7]
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