What is the name of a fluid collection containing lymph from an injured lymph vessel, commonly associated with organ transplant and lymph node removal?

• A. Lymphocele
• B. Retroperitoneal Abscess
• C. Abdominal Aortic Aneurysm
• D. Fusiform Aneurysm

Answer: (A)

Lymphocele forms when lymphatic vessels are injured during procedures like organ transplantation or lymph node dissection, allowing lymph fluid to accumulate in a peritransplant or retroperitoneal space. On ultrasound, it appears as a well-defined, anechoic to hypoechoic cystic collection in the expected postoperative area, often without internal echoes and usually without internal vascularity on Doppler. It can be simple or multiloculated with thin septations, and it contains sterile lymph fluid rather than pus or blood. This distinguishes it from an abscess (which would show debris, possible gas, and signs of infection) and from vascular aneurysms (which are pulsatile, connect to the arterial system, and are not cystic collections).