Abstract
BackgroundPigmentary mosaicism (PM), also known as Blaschkoid dyspigmentation, is a rare pigmentary anomaly. Although several case reports have been published describing extracutaneous manifestations associated with PM, there are very few studies on the clinical characteristics of patients with PM. AimTo describe the clinical characteristics of patients with PM. Patients and methodsThis descriptive cross-sectional study was conducted among 47 children examined by a dermatologist and a pediatrician. The pattern and location of the PM, type of pigmentation and extracutaneous manifestations were documented. ResultsThe most common pattern of PM was narrow-band PM, followed by broad-band and checkerboard patterns. The trunk was the most affected region, followed by the legs and arms. PM manifested as hypopigmentation in 51.1% of cases, as hyperpigmentation in 27.6%, and as hypo/hyperpigmentation in 21.2%. Accompanying diseases were present in 40.4% of patients: neuropsychiatric diseases were the most common, followed by endocrinological or hematological diseases and growth/developmental delay. ConclusionPM has been associated with several extracutaneous findings but there is still some debate whether these associations reflect different PM phenotypes or whether they are simply coincidental. Our study suggests that extracutaneous involvement in PM patients is frequent, thus warranting careful examination of PM patients.
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