Abstract
Purpose:
To determine the MR findings of cervical lymphadenopathy which distinguish tuberculous lymphadenitis(TL) from metastatic lymphadenopathy(ML).
Materials and Methods:
We retrospectively analyzed the MR findings of 14 patients with TL and 19 with ML. Thirty-nine lesions in 14 patients with TL and 80 lesions in 19 with ML were classified into three categories: conglomerate lesion (TL, 7 å ML, 8) å discrete lesion without necrosis (TL, 3 å ML, 15) å and discrete lesion with necrosis (TL, 29 å ML, 57). Between TL and ML, we compared age, sex, bilaterality, multiplicity, associated pulmonary tuberculosis, infiltration of adjacent fat, muscle, skin and subcutaneous tissue, margin, and signal intensities on Tl- and T2-weighted images. In discrete lesion, we also compared the minimal to maximal dimension ratio, and in discrete necrotic lesion, the thickness and evenness of rim enhancement, and the location and extent of necrosis.
Results:
There were statistically significant differences between TL and ML in age(34.7 ± 13.1 years å 56.1 土 14.3 years), male to female ratio(3 : 11; 13 : 6), bilaterality(l/l4; 10/l9), multiplicity(5 å Μ/19), and associated active pulmonary tuberculosis(7/l4; l/l9). On T2-weighted images, TL showed predominantly homogeneous (30/39) or high (20/39) signal intensity, similar to that of cerebrospinal fluid, but the signal inteusity of ML was predominantly heterogeneous(58/80), or lower than or similar to that of fat(4l/80). Between TL and ML, however, there were no statistically significant differences in infiltration of adjacent tissue, margin, signal intensity and its heterogeneity on Tl-weighted image, minimal to maximal dimension ratio, thickness and evenness of rim enhancement, or the location and extent of necrosis.
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![]() | Fig. 1.MR images of 15-year-old women with tuberculous lymphadenitis. A. Axial Tl-weighted image shows a discrete lymph node(arrows) with necrosis at level II on right side. Note slightly high signal intensity in peripheral portion and relatively low signal intensity in central area of the lesion. B. Coronal Τ 2-weighted image shows multiple enlarged lymph nodes that have homogeneously high signal intensities similar to that of cerebrospinal fluid(arrows). C & D. Gd-DTPA enhanced axial (c) and coronal(D) Tl-weighted images, obtained at the same levels as A and B, show uneven rim enhancement of the lesions(arrows). |
![]() | Fig. 2.MR images of 52-year-old man with tuberculous lymphadenitis. A. Axial Tl-weighted image shows multiple conglomerate lymph nodes in the right posterior triangle and internal jugular chain(arrows), slightly hyperintense to muscle. B. On axial T2-weighted image, lymph nodes show homogeneous and high signal intensity similar to that of cerebrospinal fluid(arrows). C. On Gd-DTPA enhanced axial Tl-weighted image, some nodes have ringlike enhancement(arrows), some have homogeneous enhancement(open arrows) with extension into adjacent soft tissues (white arrows). |
![]() | Fig. 3.MR images of 54-year-old woman with metastatic lymphadenᄋpathy. A & B. Axial Tl-(A) and T2-weighted(B) images show two enlarged lymph nodes in the right neck with difference in signal intensity. Anterior node(arrows) has homogeneity in signal intensity on Tl-weighted image, and central low signal intensity with peripheral high signal intensity on T2-weightea image. But, posterior node(open arrows) has heterogeneity in signal intensity on Tl- and 12-weighted images. C. Gd-DTPA enhanced axial Tl-weighted image shows rim enhancement with multiple central non-enhancing portions in anterior node(arrow) and heterogeneous enhancement in posterior nodefopen arrow). |
![]() | Fig. 4.MR images of 36-year-old woman with metastatic lymphadenopathy. A. Axial Tl-weighted image shows an enlarged lymph node of signal intensity similar to that of muscle(arrow) at right parapharyngeal space. B. On axial T2-weighted image, lymph node shows heterogeneous and low signal intensity similar to that of fat(arrow). C. Gd-DTPA enhanced axial Tl-weighted image shows thick peripheral enhancement(arrow). |
Table 1.
Comparison of Patients between Tuberculous Lymphadenitis and Metastatic Lymphadenopathy
Table 2.
Location of Lymph Node in Tuberculous Lymphadenitis and Metastatic Lymphadenopathy∗
Location | Tuberculosis | Metastasis |
---|---|---|
N I | 1 | 5 |
N II | 5 | 14 |
N III | 3 | 15 |
N IV | 6 | 6 |
N V | 5 | 6 |
Mediastinal | 3 | 1 |
Parapharyngeal or ι | “etropharyngeal 0 | 5 |
Table 3.
Comparison of Adjacent Tissue Invasion between Tuberculous Lymphadenitis and Metastatic Lymphadenopathy
Tuberculosis N=15(%) | Metastasis N=29(%) | P-value∗ | |
---|---|---|---|
Adjacent fat invasion | 8(53) | 16(55) | NS |
Adjacent muscle in vasion | 5(33) | 14(48) | NS |
Dermal and subcuta neous manifestation | 7(47) | 8(28) | NS |
Table 4.
Comparison of MR Characteristics of Lesions between Tuberculous Lymphadenitis and Metastatic Lymphadenopathy
Table 5.
Comparison of MR Characteristics of Necrotic Lesions between Tuberculous Lymphadenitis and Metastatic Lymphadenopathy
1998亼䰼 䴀⪤䏗㽔㻠㢨⪧⥴ 㛯㥬⩷㽔 㢄㟫 㪸佌(ΠΙ)