Complicated (Haemorrhagic) 2nd Branchial Cleft Cyst.
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___ Clinically :
It may presents in childhood as a swelling or later when complicated.
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___ Findings :-
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A well-defined complex cyst in left lateral neck.
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With fluid-debris level (layering means complication either hge or infection which causes rapid increase in size).
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Located superficial to CCA, submandibular galnd and inferolateral to angle of mandile.
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___ DD :-
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1st branchial cleft cyst (higher location near parotid or ear).
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Plunging ranula (if has deeper component and dumbbell shape).
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Sternomastoid haematoma or abscess (intra-muscular and different history).
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Lymphatic or vascular malformation (younger age, multicoluar,…).
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LN (esp. if cystic as in suppurative nodes or pseudocystic as in lymphomatus nodes).