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Start free with EleplanIntellectual disability, Buenos-Aires type
ORPHA:3079Malformation syndrome
Also called Mutchinick syndrome
What it is
Intellectual disability, Buenos-Aires type is a rare intellectual disability syndrome characterized by growth retardation, microcephaly, characteristic facial features (including narrow forehead, bushy eyebrows, hypertelorism, small, downward-slanting palpebral fissures with blepharoptosis, malformed and low-set ears, broad straight nose, thin upper lip, and a wide, tented mouth), developmental delay, intellectual disability, speech disorder, and multiple organ malformations (e.g. ventricular septal defect, megaloureter, dilated renal pelvis). Additional manifestations reported include neurocutaneous lesions (including palmoplantar hyperkeratosis), internal hydrocephalus, and bilateral partial soft-tissue syndactyly of second and third toe.
Key facts
- Prevalence
- <1 / 1 000 000
- Age of onset
- Neonatal
- 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
Very common80–99%
28- Abnormal cardiac septum morphology
- Abnormal dental morphology
- Abnormal fingernail morphology
- Abnormality of pelvic girdle bone morphology
- Abnormality of speech or vocalization
- Abnormality of the calvaria
- Biparietal narrowing
- Clinodactyly of the 5th finger
- Cuboid-shaped thoracolumbar vertebral bodies
- Dental malocclusion
- Downslanted palpebral fissures
- Fine hair
- High palate
- Hyperconvex thumb nails
- Hypertelorism
- Intellectual disability
- Macrotia
- Mandibular prognathia
- Microcephaly
- Open bite
- Pectus carinatum
- Photophobia
- Reduced bone mineral density
- Short stature
- Sloping forehead
- Spastic gait
- Umbilical hernia
- Wide nasal bridge
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.
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.
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