Absence of the inferior portion of the trapezius muscle in three family members.

Abstract excerpt

Absence of the trapezius muscle is regarded as relatively rare. This report presents the clinical observations for absence of the inferior portion of the trapezius muscle in three family members that were later confirmed in vivo with magnetic resonance imaging. The absences occurred in two sisters and the son of one sister. The inferior portion of trapezius was absent bilaterally in the sisters but was absent on...

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