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Unilateral hypoplasia of pectoralis major muscle
Hypoplasia (underdevelopment) of the pectoralis minor on only one side of the chest. [from HPO]
Poland anomaly
Poland syndrome consists of unilateral absence or hypoplasia of the pectoralis muscle, most frequently involving the sternocostal portion of the pectoralis major muscle, and a variable degree of ipsilateral hand and digit anomalies, including symbrachydactyly. Sometimes called Poland sequence, it was first described by Poland (1841). Poland syndrome is most commonly a sporadic condition (David, 1982; Opitz, 1982), but familial cases have been reported. [from OMIM]
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