传染性单核细胞增多症同时合并流行性腮腺炎临床较少见 ,我科于２０００年７月收治１例并作了肝脏穿刺组织活检 ,现就其临床特点及肝活检组织超微结构特点报道如下。患儿女性 ,４岁。因发热、两耳下肿痛７天于２０００年７月５日入院。发病后无头痛、呕吐、腹痛 ,无皮疹、黄疸 Infectious mononucleosis combined with mumps clinical less common, our department in July 2000 admitted to a case and made a liver biopsy, are now on its clinical features and ultrastructural features of liver biopsy reported as follows. Children with children, 4 years old. Due to fever, swelling and pain in both ears 7 days in July 5, 2000 admission. After the onset of no headache, vomiting, abdominal pain, no rash, jaundice