branchial sinus


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Related to branchial sinus: branchial fistula

branchial sinus

an abnormal cavity or space that opens externally on the inferior third of the neck, anterior to the sternocleidomastoid muscle; it usually results from failure of the second pharyngeal groove and cervical sinus to obliterate.
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In rare cases, a branchial sinus is also found to have an internal opening, thus forming a true branchial fistula.