If you are here because something looks different about your child's body: You are in the right place. This guide is built for parents who are seeing something and trying to understand what it might mean. Use the symptom cards below to find what you are seeing and learn whether it could be Poland anomaly.
How Poland anomaly presents
Poland anomaly is not a single symptom — it is a pattern. The defining feature is partial or complete absence of the pectoralis major muscle on one side of the body. But Poland anomaly can also involve the hand and fingers, the ribs, and in females, the breast — all on that same side.
What makes Poland anomaly easy to miss is that not everyone has every feature. Some people have only the missing chest muscle with no hand involvement at all. Others have significant hand differences with relatively subtle chest asymmetry. The condition exists on a spectrum, and no two cases look exactly alike.
One thing is consistent: Poland anomaly is always on one side. It never affects both sides simultaneously. About 75% of cases involve the right side of the body.
Find your symptom
Each card below links to a dedicated page explaining that symptom in detail: what it looks like, why it happens in Poland anomaly, what other conditions can cause it, when to see a doctor, and what kind of specialist to ask for.
Not sure what you are seeing?
If you are unsure which symptom best describes what you have noticed — or if your child has features across more than one category — the interactive symptom checker can help you work through the possibilities and understand whether Poland anomaly is a likely explanation.
The symptom checker is not a diagnostic tool, but it walks through the key questions a physician would ask and can help you understand whether what you are seeing fits the Poland anomaly pattern well enough to pursue an evaluation.
When to see a doctor
You should seek a medical evaluation if:
- One side of your child's chest looks consistently flatter or more hollow than the other
- The front fold of the armpit is absent or less defined on one side
- Your child has webbed, fused, or noticeably shorter fingers on one hand
- One hand is significantly smaller than the other
- A daughter's breast on one side is not developing, or is developing significantly less than the other side
- Any combination of the above features on the same side of the body
None of these features individually confirms Poland anomaly — other conditions can cause each of them. But when they appear on the same side, Poland anomaly should be on the list of considerations. A referral to a pediatric plastic surgeon or a genetics clinic is usually the most direct path to an answer. Our specialist directory can help you find experienced providers near you.
What to tell the doctor
When you bring your child to an appointment, describing all the features you have noticed — even if they seem unrelated — is important. Physicians who see only one feature may not immediately connect it to Poland anomaly. But presenting chest asymmetry, hand differences, and any other observations together gives a specialist the full picture they need.
You can also say the name directly: "I've been reading about Poland anomaly and I think this might be what I'm seeing." Most physicians respond well to an informed, specific question.