Ellen S Haddock1, Antoanella Calame2, Chisato Shimizu3, Adriana H Tremoulet3, Jane C Burns3, Wynnis L Tom4. 1. School of Medicine, University of California, San Diego in La Jolla, California. 2. Department of Dermatology, University of California, San Diego, California; Compass Dermatopathology, La Jolla, California. 3. Department of Pediatrics, University of California, San Diego, California; Rady Children's Hospital, San Diego, California. 4. Department of Dermatology, University of California, San Diego, California; Department of Pediatrics, University of California, San Diego, California; Rady Children's Hospital, San Diego, California. Electronic address: wtom@rchsd.org.
Abstract
BACKGROUND: A psoriasis-like eruption develops in a subset of patients with Kawasaki disease (KD). OBJECTIVE: We sought to systematically compare KD-associated psoriasiform eruptions with classic psoriasis and the outcomes of KD in children with and without this rash. METHODS: This was a retrospective study of 11 KD cases with a psoriasiform eruption matched 1:2 by age, gender, and ethnicity with psoriasis-only and KD-only controls. Genotyping was performed in 10 cases for a deletion of 2 late cornified envelope (LCE) genes, LCE3C_LCE3B-del, associated with increased risk for pediatric-onset psoriasis. RESULTS: Similar to classic psoriasis, KD-associated eruptions were characterized clinically by well-demarcated, scaly pink plaques and histopathologically by intraepidermal neutrophils, suprabasilar keratin 16 expression, and increased Ki-67 expression. They showed less frequent diaper area involvement, more crust and serous exudate, and an enduring remission (91% vs 23% with confirmed resolution; P < .001). Frequency of LCE3C_LCE3B-del and major KD outcomes were similar between cases and controls. LIMITATIONS: The study was limited by the small number of cases, treatment variation, and availability of skin biopsy specimens. CONCLUSIONS: Although the overall clinical and histopathologic findings were similar to conventional psoriasis, this appears to be a distinct phenotype with significantly greater propensity for remission. No adverse effect on KD outcomes was noted.
BACKGROUND: A psoriasis-like eruption develops in a subset of patients with Kawasaki disease (KD). OBJECTIVE: We sought to systematically compare KD-associated psoriasiform eruptions with classic psoriasis and the outcomes of KD in children with and without this rash. METHODS: This was a retrospective study of 11 KD cases with a psoriasiform eruption matched 1:2 by age, gender, and ethnicity with psoriasis-only and KD-only controls. Genotyping was performed in 10 cases for a deletion of 2 late cornified envelope (LCE) genes, LCE3C_LCE3B-del, associated with increased risk for pediatric-onset psoriasis. RESULTS: Similar to classic psoriasis, KD-associated eruptions were characterized clinically by well-demarcated, scaly pink plaques and histopathologically by intraepidermal neutrophils, suprabasilar keratin 16 expression, and increased Ki-67 expression. They showed less frequent diaper area involvement, more crust and serous exudate, and an enduring remission (91% vs 23% with confirmed resolution; P < .001). Frequency of LCE3C_LCE3B-del and major KD outcomes were similar between cases and controls. LIMITATIONS: The study was limited by the small number of cases, treatment variation, and availability of skin biopsy specimens. CONCLUSIONS: Although the overall clinical and histopathologic findings were similar to conventional psoriasis, this appears to be a distinct phenotype with significantly greater propensity for remission. No adverse effect on KD outcomes was noted.
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