Define Approach to a Dysmorphic Child. Describe its investigations, management and prognosis.

Definition

A dysmorphic child has abnormal physical features arising from abnormal development. A systematic approach helps reach a specific diagnosis, which guides management, prognosis and recurrence-risk counselling.

Key Terminology

History

• Antenatal — teratogen/drug/alcohol exposure, maternal illness (diabetes), infections (torch), oligo/polyhydramnios.
• Family history — a three-generation pedigree, consanguinity, recurrent miscarriages, similarly affected relatives.
• Birth and developmental history.

Examination

• Growth parameters including head circumference; note proportionate vs disproportionate.
• Systematic head-to-toe survey for major and minor anomalies (facies, ears, eyes, hands, genitalia), with objective measurements (inter-canthal distance, span, etc.).
• Examine parents/relatives where relevant.

Investigations

• Karyotype for suspected chromosomal disorders; fish for microdeletions (e.g. 22q11).
• Chromosomal microarray (copy-number changes) and targeted molecular/gene testing.
• Metabolic screen (TMS/urine organic acids) if an IEM is suspected; imaging (skeletal survey, echo, cranial/renal ultrasound).

Approach & Management

• Pattern recognition (and use of dysmorphology databases) to reach a syndromic diagnosis.
• Multidisciplinary management of the associated problems; developmental support.
• Genetic counselling — diagnosis, prognosis, recurrence risk and options.

Minor VS Major Anomalies

• Minor anomalies (e.g. Single palmar crease, epicanthic folds, ear tags) have little functional impact but, when multiple, flag an underlying syndrome.
• Major anomalies (e.g. Congenital heart disease, cleft palate, neural-tube defect) have functional/cosmetic consequences and need treatment.

Common Patterns to Recognise

• Down (upslanting fissures, simian crease), Turner (webbed neck, short stature), Marfan (tall, arachnodactyly).
• DiGeorge (cardiac + hypocalcaemia), Prader-Willi (hypotonia → obesity), fetal alcohol syndrome (teratogen).

Multidisciplinary Care

Once a diagnosis is reached, a team (paediatrics, cardiology, surgery, ophthalmology, genetics, therapy services) manages the associated problems, and the family receives counselling and support.

Common Teratogens (a Key History Point)

• Alcohol (fetal alcohol syndrome), phenytoin, valproate, warfarin, retinoids, thalidomide.
• Maternal diabetes, and congenital infections (torch) — rubella, CMV, toxoplasma.

When to Refer to Genetics

• Multiple anomalies, dysmorphism with developmental delay, a positive family history, or diagnostic uncertainty.
• Before/after prenatal testing and for recurrence-risk counselling.

Deformation VS Malformation (clinical Value)

Distinguishing a deformation (e.g. Positional talipes from oligohydramnios — good prognosis, often correctable) from a malformation (intrinsic, e.g. A structural heart defect) matters for prognosis, recurrence risk and management.

Prognosis & Counselling

Prognosis depends entirely on the specific diagnosis and its associated anomalies; even without a treatment change, a precise diagnosis provides the family with recurrence risk, expected complications to watch for, and access to support networks.

Principles of Evaluation (summary)

Detailed history (antenatal, family, pedigree) → Systematic examination with measurements → Targeted investigations (karyotype/microarray/molecular/metabolic/imaging) → Pattern recognition → diagnosis → Multidisciplinary management + genetic counselling