## Core Concept
Poland syndrome is a rare congenital disorder characterized by underdevelopment or absence of the pectoralis muscle on one side of the body. It often presents with other associated anomalies.

## Why the Correct Answer is Right
The classic features of Poland syndrome include unilateral absence or hypoplasia of the pectoralis major muscle, ipsilateral syndactyly (webbing) of the fingers, and sometimes other anomalies like rib defects or vertebral anomalies. The correct answer relates to understanding what is typically not associated with Poland syndrome.

## Why Each Wrong Option is Incorrect
- **Option A:** Typically seen in Poland syndrome, as it involves the pectoralis muscle.
- **Option B:** Often associated with Poland syndrome; patients may have various upper limb anomalies.
- **Option C:** Can be associated; rib and skeletal anomalies are part of the spectrum.
- **Option D:** Usually not a feature; Poland syndrome primarily affects the anterior chest wall and ipsilateral hand.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that Poland syndrome predominantly affects males and usually presents unilaterally. A classic association is the combination of pectoralis muscle agenesis with ipsilateral hand syndactyly.

## Correct Answer: D.