Bloch Sulzberger syndrome, also known as incontinentia pigmenti is a rare X-linked dominant syndrome with cutaneous, neurologic, ophthalmologic, and dental manifestations.
A family history is reported in the mother in about 28% patients. In about 62% patients, the syndrome manifests sporadically.
It is present at birth and if not seen at birth then most of the patients develop it within the first two weeks of birth. There is presence of vesicular eruptions on a base of erythema and the lesions follow Blaschko lines.
The lesions are more often seen over the trunk and the extremities but may be seen on other parts of the body as well. They are generally present till the fourth month of life and then resolve. Rarely recurrence of vesicular lesions have been reported in association with a febrile illness or routine immunization  .
Verrucous lesions are seen over the skin. They are typically wart like and thickened plaques appear as if on a healed lesion. They develop on the lines of Blaschko and are generally seen after the first stage of skin eruption. They occur in 80% of the patients and resolve over few weeks to months.
This stage involves the development of hyperpigmented skin where discoloration may be in the form of whorls and streaks. This is also seen along the lines of Blaschko. They cannot be correlated with the previous lesions; neither do they compulsorily appear on the same areas as the verrucous and the vesicular skin eruptions. They develop slowly and resolve during adolescence only.
The lesions are spread over the trunk, extremities, skin folds and the neck and occur in more than 90% patients.
This stage comprises of hypopigmented and atrophic patches which may be seen after the stage 3 and persist throughout adulthood. It is usually seen as hairless streaks or light colored linear patches. This is a very characteristic feature of this syndrome.
The dental and the oral changes are very prominent and seen in 50-80% patients . There is delay in eruption of the teeth. Partial anodontia or hypodontia may be noticed. There is abnormal growth of teeth, typically pegged or conical in shape. Occasionally a part of the teeth may be missing or the enamel may be under developed. The most common association is high arched palate and cleft palate.
Retinal changes involve the retinal vasoocclusive changes along with ischemia, optic atrophy and developmental defects which lead to blindness and loss of visual acuity . It leads to retinal detachment and a series of changes which ultimately lead to blindness. Other changes which may be seen are keratitis, cataracts and conjunctival pigmentation.
Neurological symptoms are seen due to microvascular vasoocclusive ischemia resulting in extensive infarction caused by cerebral arteries. Along with ischemic vascular insult we have developmental delay, neonatal seizures, recurrent acute stroke, mental retardation, ataxia, microcephaly and porencephaly as other central nervous manifestations occurring in this syndrome  .
Jaw & Teeth
In stage 3, the bumps go away, but leave behind darkened skin, called hyperpigmentation. After several years, the skin returns to normal. In stage 4, there may be areas of lighter-colored skin (hypopigmentation) that are thinner. [mountsinai.org]
However, Blaschko linear hyperpigmentation can be observed in a heterogeneous group of mosaic conditions, eg, hypomelanosis of Ito (HI). [jamanetwork.com]
As the individuals reaches adulthood, the scars and areas of hyperpigmentation fades away. [epainassist.com]
[…] overlying an erythematous base in a pattern that follows the Blaschko lines (from birth to about four months of age),2.Verrucous: lesions are crusted and appear as wart-like rash (for several months),3.hyperpigmented: grey brown linear swirling macular hyperpigmentation [dailyrounds.org]
Four clinical stages are recognized: blister, verrucous or wart like lesions, hyperpigmentation and atrophic lesions. [scielo.org.pe]
- Decreased Sweating
In lesions there is hair loss, decreased sweating. 2.2. Nail manifestations Nail dystrophy occurs in 40% of patients. Clinical manifestations vary from mild nail ripples to severe nail dystrophy resembling onychomycosis. 2.3. [vinmec.com]
The diagnosis is made on the following diagnostic criteria:
- If NEMO mutation is unconfirmed, and incontinent pigmenti is absent in first-degree female relatives, 2 major or 1 major + 1 minor criteria need to be satisfied.
- If NEMO mutation status is unconfirmed but condition is confirmed in a 1st degree female relative, then 1 major criteria or 2 minor criteria need to be satisfied.
- If NEMO mutation status is confirmed, then any 1 major or 1 minor criteria needs to be confirmed.
Major critera include typical cutaneous manifestations while minor criteria include dental, CNS, breast, nipple, palate and ocular anomalies, alopecia/abnormal hair, abnormal nails, history of multiple spontaneous abortions and typical histological skin findings.
The blood investigations show raised eosinophil counts which are commonly seen in most of the skin disorders. In patients whom Bloch Sulzberger syndrome is strongly suspected, karyotyping and genetic studies should be performed. Also, if a skin biopsy is done in the earlier stages then diagnosis of incontinentia pigmenti is confirmed. The histologic findings of every stage of skin eruption are different but extremely informative as regards the diagnosis.
If we perform a CT scan and a MRI in view of the neurological and ophthalmic manifestations, we will notice decreased blood supply and other ischemic changes. There will be seen areas of infarcts in the brain.
Complications like secondary bacterial infections should be prevented aggressively. Treatment of the symptomatic complaints is the only relief. As the disease is the result of a genetic mutation, there can be no reversal.
Use of anticonvulsants for seizure control is recommended. Pediatric periodontist must be visited regularly for prevention of further damage to the oral cavity. Ophthalmologist consultation at regular intervals is necessary for management of retinal damage. Cryosurgery might help treat retinal proliferation .
Dermatologists and neurologists are indispensable in throughout life for recurrent symptomatic relief and management.
Bloch Sulzberger syndrome is caused due to a genetic mutation in the X sex chromosome and hence, it is a dominant X-linked disorder.
It is the result of a mutation in the NEMO/IKK-gamma gene located on the sex chromosome Xq28. The gene is necessary for activation of a transcription factor NF-kappaB that is key to regulate immunity, apoptosis and inflammation.
A single mutation in the gene is the cause for almost 80% of the cases. Recently, 21 point mutations have been discovered that lead to incontinent pigmenti . The condition when occurring in males is also called as ‘male lethal syndrome’.
It is an X-linked disorder and hence most commonly seen in females at the prenatal age. In rare cases, it may be seen in males manifesting Klinefelter Syndrome or due to mosaicism/hypomorphic mutations in the gene called NEMO .
Its manifestations are seen in children at birth or develop during infancy in about 90% patients. The skin manifestations are characteristic and remain for lifetime. After the skin eruptions show up, there may be neurological manifestations and also dental changes seen in early childhood.
Morbidity and mortality depend on the age and severity of the cutaneous as well as extracutaneous signs and symptoms. It is more commonly seen in whites than blacks.
Uptill 1987, just 700 cases of this rare disease had been reported in literature. The underreporting is probably due to many cases going undiagnosed or misdiagnosed.
Bloch Sulzberger syndrome is an X-linked dominant disorder and affects those tissues that arise from the ectoderm and neuroectoderm.
Involvement of skin, central nervous system and dental tissues is a part of this syndrome. It manifests as an ectodermal dysplasia affecting even the hair, teeth and nails.
In females, lionization produces functional mosaicism of the X-linked genes. This is manifested as blaschkoid distribution of skin . Normal chromosomes are active in the areas where the skin is unaffected whereas the abnormal mutated X chromosome is active in the skin lesions which are affected by the disease.
There are no guidelines for prevention of Bloch Sulzberger syndrome.
Bloch Sulzberger syndrome is also called as Incontinentia Pigmenti. It is a dominant X-linked disorder affecting the skin, central nervous system, eyes and teeth.
The first case was seen in 1906 by Garrod and later on the condition was redefined in 1926 and 1928 by Bloch and Sulzberger as a syndrome with multi-systemic affections.
Bloch Sulzberger syndrome is a dominant X linked disorder due to genetic changes. A lot of symptoms are seen in various systems in the individual. The symptoms are seen at birth or within 2 weeks of birth. The most dominant skin manifestations are excellent for diagnosis of the syndrome.
There are four stages of skin eruptions described as vesicular, verruceous, hyperpigmentation and hypopigmentation stage. Apart from the cutaneous manifestations there occur changes in the central nervous system, eyes, hair, nails, teeth and oral changes. There is blockage in the arteries of the retina and the brain which lead to further complications like blindness and stroke etc. The dental and oral changes are seen more as abnormal growth of teeth and enamel. There is lack of enamel and pegged teeth are seen along with delayed dental development. Alopecia is seen as the hair change and there is nail ridging.
To investigate the condition one must carefully take the history, notice the skin eruptions and send in for histologic findings, blood tests which shows eosinophilia, CT scan and MRI scan which reveal infarction and ischemic changes. As the disease is genetic in nature one must conduct karyotyping and genetic study report.
There are no specific drugs which help in recovery; only symptomatic relief can be given. Prognosis is good if the extra cutaneous manifestations are taken care off.
- Kenwrick S, Woffendin H, Jakins T, et al. Survival of male patients with incontinentia pigmenti carrying a lethal mutation can be explained by somatic mosaicism or Klinefelter syndrome. Am J Hum Genet. Dec 2001;69(6):1210-7.
- Conte MI, Pescatore A, Paciolla M, Esposito E, Miano MG, Lioi MB, et al. Insight into IKBKG/NEMO Locus: Report of New Mutations and Complex Genomic Rearrangements Leading to Incontinentia Pigmenti Disease. Hum Mutat. Feb 2014;35(2):165-77
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