Most occur in the base of the neck, both in the anterior and the posterior triangle, and may extend up to the jaw, over the anterior chest wall, and down into the axilla. Rarely, it occurs alone in the axilla, pelvis, or groin.
It presents as a soft, fluctuant and highly transilluminable lump just beneath the skin. It may be lobular and usually is painless. It contains clear fluid and may be of any size.
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