31. Unlike the cardiovascular system, the lymphatic system is not closed and has no central pump. 32. Anatomist Henri Rouvi�re ( 1876-1952 ) continued Sappey's anatomical work of the human lymphatic system . 33. Instead it's picked up by the lymphatic system . 34. Several months later, David found out he had Hodgkin's disease, a cancer of the lymphatic system . 35. Today, his anatomical collections involving the lymphatic system are preserved in museums of Heidelberg and Li�ge. 36. It contains large cyst-like cavities containing lymph, a watery fluid that circulates throughout the lymphatic system . 37. Ong had suffered for years from lymphoma, a form of cancer that targets the lymphatic system . 38. :* In lymphedema abnormal removal of interstitial fluid is caused by failure of the lymphatic system . 39. For years, Ong, 66, has suffered from lymphoma, a form of cancer that targets the lymphatic system . 40. Cystic hygromas occur when the lymphatic vessels that make up the lymphatic system are not formed properly.