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Clinical study of 40 cases of incontinentia pigmenti
Smaïl Hadj-Rabia1, David Froidevaux, Nathalie Bodak
1Department of Dermatology, Hôpital Necker-Enfants-Malades, Paris, France.
Insights
Incontinentia pigmenti (IP) diagnosis requires careful clinical evaluation, especially in neonates. Early multidisciplinary follow-up is crucial for managing potential ocular and neurological complications in children with IP.
Area of Science:
- Dermatology
- Pediatrics
- Genetics
Background:
- Incontinentia pigmenti (IP) is a rare genetic disorder affecting the skin, nails, teeth, eyes, and central nervous system.
- Accurate diagnosis and management are essential due to the potential for severe complications.
Purpose of the Study:
- To analyze the distribution of clinical manifestations in a pediatric cohort with incontinentia pigmenti.
- To establish guidelines for the follow-up of children diagnosed with IP.
Main Methods:
- Retrospective study of 47 children diagnosed with IP between 1986 and 1999.
- Clinical diagnosis evaluated using Landy and Donnai criteria.
- Data collected from private and institutional practices of dermatologists and pediatricians.
Main Results:
- 7 patients were misdiagnosed due to overlapping features with other pigmented disorders.
- Neonatal skin lesions (erythema, vesicles, hyperkeratosis) were rarely absent in IP patients.
- Ocular and neurological abnormalities were frequent (20% and 30%), though typically not severe (8% and 7.5%).
Conclusions:
- Clinical diagnosis is paramount for phenotype/genotype correlation, aiding understanding and therapy development for IP.
- Molecular analysis and characteristic histological features are valuable in diagnosing IP, especially in ambiguous cases.
- Multidisciplinary follow-up, particularly in the first year, is vital for detecting ophthalmologic and neurological complications; neuroimaging is recommended for abnormal neurological findings or retinopathy.
Objective:
To analyze the distribution of manifestations in a pediatric cohort and define guidelines for follow-up of incontinentia pigmenti (IP).
Design:
Retrospective study of 47 children referred to the Department of Pediatric Dermatology with a diagnosis of IP between 1986 and 1999.
Setting:
The private or institutional practice of participating dermatologists and pediatricians.
Main Outcome Measures:
Evaluation of IP clinical diagnosis using the Landy and Donnai criteria.
Results:
Because hyperpigmentation following the Blaschko lines may be observed in several pigmented disorders, 7 patients were found misdiagnosed. During the neonatal period, erythema, vesicles, and hyperkeratotic le sions were rarely absent in the patients with IP. Ocular and neurological abnormalities were frequent (20% and 30%, respectively) but rarely severe (8% and 7.5%, respectively).
Conclusions:
Clinical diagnosis is the first main step for a correct phenotype/genotype correlation, which remains indispensable to better understand the pathological mechanisms of IP and develop new therapies. In doubtful cases, molecular analysis is helpful but characteristic histological features must be added as major criteria for IP diagnosis. Multidisciplinary follow-up is needed, particularly during the first year of life, to detect possible ophthalmologic and neurological complications. Neuroimaging ought to be performed in the case of abnormal neurological examination results or when vascular retinopathy is detected.
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