This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
All are true about cystic hygroma except 
Select and explain. 
A. Pulsatile, B. May cause respiratory obstruction, C. Common in neck, D. present in bih
A: Pulsatile
Answer: A: Pulsatile 
Explanation: Cystic hygroma is not pulsating .So option 1 is incorrect. Cystic hygroma is sequestration of lymphatic tissue. Cyst filled with clear lymph and lined by single layer of epithelium. Mostly found in the neck. It can obstruct labour, and can also cause respiratory difficulty. Swelling is brilliantly transluminant. Management: Injection of sclerosant and excision of Cyst. Reference: Bailey and love 27th edition, page no. 754.