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Among chest wall deformities in children, Pectus Excavatum and Pectus Carinatum are the two most common types. Many parents have difficulty distinguishing between them and may confuse the two conditions.
Although both are chest wall deformities, they differ significantly in appearance, underlying causes, health impact, and treatment approaches. This article compares them from multiple perspectives to help you accurately differentiate between the two and choose the right evaluation and treatment direction for your child.
Pectus Excavatum and Pectus Carinatum are opposite in appearance:
Pectus Excavatum (Funnel Chest)
The sternum and costal cartilages sink inward toward the thoracic cavity. From the front, the chest appears to have a "pit" or "dent," shaped like a funnel. The depression becomes more noticeable when the child takes a deep breath.
Pectus Carinatum (Pigeon Chest)
The sternum and costal cartilages protrude forward. From the side, the chest appears raised, resembling the breastbone of a chicken or pigeon. The prominence becomes more evident when the child stands upright.
A simple way to remember:
Pectus excavatum → caves in
Pectus carinatum → sticks out
| Comparison | Pectus Excavatum | Pectus Carinatum |
|---|---|---|
| Proportion among chest wall deformities | Approximately 90% or more | Approximately 9% |
| Estimated incidence in China | Approximately 1‰ – 3‰ | Lower than pectus excavatum |
| Male-to-female ratio | Boys : Girls ≈ 3–4 : 1 | Boys : Girls ≈ 4 : 1 |
| Family history | Approximately 30% – 37% | Approximately 25% |
| Typical age of detection | Often becomes noticeable after age 3–5 | Often becomes noticeable after age 3–5 |
The underlying mechanisms of both deformities share many similarities, including:
Genetic factors
Abnormal skeletal development
Rickets
Airway obstruction
Both conditions commonly become apparent during periods of rapid growth.
Pectus excavatum is more closely associated with abnormal development of the diaphragm; an excessively long central tendon of the diaphragm pulls the sternum downward, which is a key mechanism in its formation.
Pectus carinatum is more often related to overgrowth of the costal cartilages, which push the sternum forward. Rickets is a more common contributing factor in pectus carinatum.
| Aspect | Pectus Excavatum | Pectus Carinatum |
|---|---|---|
| Cardiopulmonary compression | More direct and pronounced; the depressed sternum pushes against the heart and lungs | Generally milder; the protruding sternum mainly reduces anterior chest space |
| Pulmonary function | Restrictive ventilatory impairment is common; reduced vital capacity is more evident | Pulmonary impact is usually milder |
| Cardiac effects | Severe cases may cause cardiac displacement or valve regurgitation | Cardiac compression is less common |
| Exercise tolerance | Significantly reduced; easy fatigue, shortness of breath | Reduction is usually less severe than in pectus excavatum |
| Postural effects | May cause rounded shoulders and hunched back | May cause compensatory spinal lordosis and back pain |
| Psychological impact | The depressed appearance affects self‑esteem | The protruding appearance also affects self‑esteem |
Overall, pectus excavatum tends to have a greater impact on cardiopulmonary function than pectus carinatum, while the psychological impact of the two conditions is comparable.
The Haller Index is the core quantitative measure for assessing severity. It is calculated from chest CT images. A normal value is approximately 2.5; an index > 3.25 is generally considered an indication for surgery.
There is currently no single widely accepted quantitative index equivalent to the Haller Index for pectus carinatum. Severity is assessed primarily based on clinical experience, considering factors such as the height of protrusion, changes in chest transverse diameter, and results of cardiopulmonary function tests. Some studies use a "sternal protrusion index," but no standardized measure has been established.
Electrocardiogram (ECG), echocardiogram, and pulmonary function tests are complementary assessments needed for both types of deformities.
| Aspect | Pectus Excavatum | Pectus Carinatum |
|---|---|---|
| Primary method | Vacuum bell | Brace therapy |
| Mechanism | Creates negative pressure over the depression, pulling the sternum outward | Applies inward pressure over the protrusion, pushing the sternum back to a normal position |
| Usage | 30–60 minutes per session; requires long‑term consistency | Worn 8–16 hours per day; treatment course 1–2 years |
The principles of conservative treatment are opposite: pectus excavatum uses outward pulling, while pectus carinatum uses inward pressing.
| Aspect | Pectus Excavatum | Pectus Carinatum |
|---|---|---|
| Main technique | Nuss procedure | Modified Ravitch procedure |
| Mechanism | A curved metal bar is placed behind the sternum to lift the depression using a lever effect | Overgrown costal cartilages are resected, the sternum is mobilized and repositioned |
| Features | Minimally invasive; the bar remains in place for 2–4 years before removal | More traditional open approach; recovery period is longer than for the Nuss procedure |
