Caring for someone with this diagnosis? Eleplan keeps diagnoses, medications, documents and every specialist in one plan.
Start free with EleplanBohring-Opitz syndrome
ORPHA:97297Malformation syndrome
Also called BOS syndrome · Bohring syndrome · C-like syndrome · Oberklaid-Danks syndrome · Opitz trigonocephaly-like syndrome
What it is
A rare multiple congenital anomalies syndrome characterized by intrauterine growth retardation (IUGR), postnatal failure to thrive, severe feeding difficulties, microcephaly/trigonocephaly, facial dysmorphism, a recognizable upper limb posture and severe developmental delay. The upper limb posture consists of internal rotation of the shoulders, flexion of the elbows, ulnar deviation of wrists and/or metacarpophalangeal joints.
Key facts
- Prevalence
- <1 / 1 000 000
- Age of onset
- Antenatal, Neonatal
- Inheritance
- Autosomal dominant
- Classified as
- Malformation syndrome
Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.
Signs and symptoms
Common30–79%
37- Agenesis of corpus callosum
- Apnea
- Axial hypotonia
- Bradycardia
- Coloboma
- Congenital contracture
- Facial hypotonia
- Feeding difficulties in infancy
- Fixed elbow flexion
- Food intolerance
- Full cheeks
- Happy demeanor
- Hypertrichosis
- Hypoplasia of the corpus callosum
- Inability to walk
- Intellectual disability, profound
- Intellectual disability, severe
- Intrauterine growth retardation
- Limitation of joint mobility
- Lower limb hypertonia
- Microcephaly
- Naevus flammeus of the eyelid
- Obstructive sleep apnea
- Optic atrophy
- Prominent metopic ridge
- Proptosis
- Recurrent infections
- Recurrent respiratory infections
- Retinal atrophy
- Severe expressive language delay
- Severe failure to thrive
- Short stature
- Sleep abnormality
- Synophrys
- Trigonocephaly
- Ulnar deviation of the wrist
- Vomiting
Sometimes5–29%
20- Anteverted nares
- Bilateral wrist flexion contracture
- Cleft lip
- Cleft palate
- Dandy-Walker malformation
- Delayed myelination
- Depressed nasal bridge
- High myopia
and 12 more in this range
These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.
Gene
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Related health topics
Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
Powered by Eleplan
A rare diagnosis is just the start. Eleplan keeps the whole care plan in one place.
Diagnoses, medications, documents, appointments, and the whole care team — organized and always in sync, so you are not retelling the same story to every new specialist. With Ellie, your AI care assistant, on top of it. Free to start.