Incontinentia pigmenti achromians
A cutaneous condition with hypopigmentation along Blaschko's lines.
Incontinentia pigmenti achromians, also called hypomelanosis of Ito or pigmentary mosaicism, is a skin disorder marked by irregular patches of lighter skin that follow Blaschko’s lines on one or both sides of the body. Although the term "hypomelanosis of Ito" comes from the consistent appearance of the skin, the condition actually encompasses a range of disorders with different genetic origins, such as polyploidies and aneuploidies. Depending on the specific genetic abnormality, the skin changes may be accompanied by a wide variety of systemic issues, including problems with the eyes, bones, muscles, and central nervous system. Unlike incontinentia pigmenti, hypomelanosis of Ito occurs equally in males and females. The condition was first documented by Japanese dermatologist Minoru Ito in 1952.
Diagnosis is made through a clinical exam, sometimes with a Wood’s lamp to better see the pigment differences. Imaging of the skeleton is also recommended. If a patient has neurological symptoms, a CT scan and MRI should be performed, and those with seizure disorders should undergo electroencephalography (EEG) to assess brain activity.
Quick Facts
- Diagnosis
- Clinical; use of Wood's lamp; skeletal imaging; computed tomography and MRI if there are neurological symptoms
Facts from the source article.
Lore & Background
Incontinentia pigmenti achromians was first described by Japanese dermatologist Minoru Ito in 1952. The condition is also known as hypomelanosis of Ito or pigmentary mosaicism. It presents with various patterns of hypopigmentation following the lines of Blaschko on one or both sides of the body.
Reader's Guide
Incontinentia pigmenti achromians is significant as a cutaneous condition that highlights the concept of pigmentary mosaicism. Its recognition as a group of disorders with various genetic causes, including polyploidies and aneuploidies, underscores the complexity of genetic skin diseases. The condition affects both genders equally, distinguishing it from incontinentia pigmenti. Diagnosis relies on clinical examination, often aided by Wood's lamp, and may involve skeletal imaging, CT scans, MRI for neurologic symptoms, and electromyography for seizure disorders. The legacy of this condition lies in its demonstration that skin findings can be a marker for broader systemic involvement, including ocular, musculoskeletal, and central nervous system defects.
Did You Know?
- The condition affects both genders equally, unlike incontinentia pigmenti.
- Diagnosis may involve Wood's lamp, skeletal imaging, CT scan, MRI, and electroencephalography (EEG).
More in Genetic disorders with OMIM but no gene 1-24
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