Abstract
Incontinentia pigmenti (IP) is an X-linked genodermatosis caused by loss-of-function mutations in the IKBKG gene (previously known as the NEMO gene). De novo mutations are responsible for the majority of IKBKG pathogenic variants, and a common recurrent rearrangement (deletion of exons 4–10) accounts for 80% of cases. The disorder is seen primarily in heterozygous females as the moderating effects of X-chromosome mosaicism allow for survival, although males can also be affected in rare circumstances. Incontinentia pigmenti is a multisystemic disorder with highly variable phenotypic expressivity. It is characterized by distinct cutaneous features which occur in four successive and overlapping stages (vesicular, verrucous, hyperpigmented, hypopigmented) with linear arrangements along Blaschko lines.
Additional neuroectodermal manifestations include varying degrees of involvement of the eyes, nails, hair, teeth, and central nervous system. These extracutaneous manifestations, particularly the ophthalmologic and neurologic, have potentially serious long-term sequelae including retinal detachment, seizures, and ischemic stroke leading to motor and/or cognitive impairment. Early recognition and diagnosis of incontinentia pigmenti are therefore critical so that appropriate monitoring, treatment, and support for these patients can be established.
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Abbreviations
- CBCT:
-
Cone beam computed tomography
- CNS:
-
Central nervous system
- DWI:
-
Diffusion-weighted imaging
- EEG:
-
Electroencephalography
- IKBKG:
-
Inhibitor of κB kinase gamma
- IP:
-
Incontinentia pigmenti
- IV:
-
Intravenous
- MDT:
-
Multidisciplinary team
- MRI:
-
Magnetic resonance imaging
- NEMO:
-
Nuclear factor-κB essential modulator
- NF-κB:
-
Nuclear factor-κB
- OCT:
-
Optical coherence tomography
- OT:
-
Occupational therapy
- PCR:
-
Polymerase chain reaction
- PT:
-
Physiotherapy
- RPE:
-
Retinal pigment epithelium
- SLT:
-
Speech and language therapy
- STIPs:
-
Subungual tumors of IP
- SWI:
-
Susceptibility-weighted imaging
- TNF:
-
Tumor necrosis factor
- VGEF:
-
Vascular endothelial growth factor
- XR:
-
X-ray
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Kieswetter, L., Pope, E. (2022). Incontinentia Pigmenti. In: Panteliadis, C.P., Benjamin, R., Hagel, C. (eds) Neurocutaneous Disorders. Springer, Cham. https://doi.org/10.1007/978-3-030-87893-1_8
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