Objective:To compare the CT manifestation between lymphoma accompanied with necrotic lymph node and lymph node tuberculosis. Methods:CT findings were reviewed in 21 patients with lymphoma accompanied with necrotic lymph node and in 35 patients with lymph node tuberculosis. The differences in the discreteness

size

proportion

enhanced form

necrotic area and CT value between necrotic lymph node in lymphoma and lymph node tuberculosis were analyzed. Results:CT findings:1Discreteness:no sta tistical significant discrepancy was found between the two groups(χ2= 0. 479

P = 0. 489). 2 Size :the short dimension of necrotic lymph node in lymphoma group(3.09±1.44)cm was significantly longer than that in lymph node tuberculosis group(1.45±0.67)cm(t=5.74

P=0.000). 3Proportion:the necrotic lymph node predominance type was more commonly seen in the lymph node tuberculosis group

but the necrotic lymph node minority type was more commonly seen in the lymphoma group(χ2=15.157

P=0.000). 4Enhanced form:non-regular enhancement was more commonly seen in the lymphoma group(χ2=8.443

P=0.004.)5Necrotic area and CT value:the necrotic area less than 50% was more commonly seen in the lymphoma group(χ2=30.366

P=0.000). The CT value of necrotic area was(39.2±9.5)HU in the lymphoma group and(40.4±10.9)HU in the lymph node tuberculosis group. No statistical significant CT value was found between the two groups(t=-0.412

P=0.682). Conclusion:There are differences in the CT manifestation between lymphoma accompanied with necrotic lymph node and lymph node tuberculosis. The necrotic lymph node minority type is more commonly seen in the lymphoma group;the necrotic lymph node is bigger in size and non-regularly enhanced

and the necrotic area is small.