D2I2.
congenital

Sprengel's deformity

Sprengel's deformity is a rare abnormality where a person has one shoulder blade that sits higher on the back than the other. The deformity is due to a failure in early development, where the shoulder fails to descend properly from the neck to its final position. The majority of cases are , with very few having inheritance.

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Plain-language summary adapted from Wikipedia. Not medical advice.