小儿降结肠系膜巨大囊性淋巴管瘤是一种罕见的先天性疾病。多数症状不明显。患者偶而发现腹部包块或囊肿增大压迫周围组织器官甚至引起并发症才来医院就诊的机会不少。 B型超声波检查中发现肠系膜囊性淋巴管瘤的病例,尚很少见。最近我科用日本产 Pediatric descending mesenteric giant cystic lymphangioma is a rare congenital disease. Most of the symptoms are not obvious. Occasionally, patients have found that there are many opportunities to visit the hospital for abdominal masses or cysts that increase the pressure on the surrounding tissues and organs and even cause complications. The cases of mesenteric cystic lymphangioma found in B-mode ultrasound examination are rare. Recently our department used Japanese products