原始神经外胚层肿瘤(PNET)首先由Hart等[1]于1973年提出。由于此病的文献报道较少,许多医务人员缺乏认识,易造成误诊。现将3例典型病例报告如下。1病例资料【例1】男,10岁。因发热、腹痛、腹部包块2个月入院。2个月前左下腹受撞后出现疼痛,呈持续性钝痛,渐加重,伴发热,排柏油便 Primitive neuroectodermal tumors (PNET) were first proposed by Hart et al. [1] in 1973. Because there are few reports of the disease in the literature, many medical personnel lack awareness and are prone to misdiagnosis. The three typical cases are reported below. 1 Case data [Example 1] Male, 10 years old. Due to fever, abdominal pain, abdominal mass was admitted to the hospital for 2 months. After 2 months ago, the left lower abdomen suffered pain, sustained dull pain, and heavier, with fever, row of asphalt.