淋巴管瘤是淋巴系統一種少見、先天性或後天性生成異常的疾病，通常好發於皮膚及皮下組織，而以頭部、頸部最為常見。且因其容易復發，而使得其治療變得非常具有挑戰性。至於侵犯骨骼肌肉系統的病灶，通常是橢圓形且囊狀，而以股骨及骨盆腔最為常見。淋巴管瘤大致上可以區分為三大類。不管是哪一類型的病灶，臨床上都有相同的病理表現，且可能同時存在於同一個病灶內。大部分的淋巴管瘤都是良性的，而完全切除病灶是避免其復發的唯一方法。
我們要報告的是一位患有膝部淋巴管瘤的病人，該病人肺部尚未有病灶侵犯現象，且在完全切除手術之後，復原狀況良好。在最近一次的追蹤，也就是手術後一年，並未有復發現象。

Lymphangiomas are uncommon, hamartomatous, congenital or acquired malformations of the lymphatic system that involve the skin and subcutaneous tissues. These lesions occur most often in the head and neck area, and the treatments continues to be a challenge. Skeletal involvement usually consists of multiple rounded, cystic lesions that most commonly occur in the femur and pelvis. Lymphangiomas can be classified into three categories; all of them showed the same pathological process and often coexist within a single lesion. Most of the lymphangiomas are benign lesions; radical excision of the lesion is the only treatment to prevent local recurrence.
A case with solitary lymphangioma over right knee was reported. No pulmonary involvement was noted. The mass was removed smoothly through anterolateral approach. No recurrence was noted in our latest follow up one year later.