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Thyroid lymph nodes

Thyroid lymph nodes are a group of cervical lymph nodes located in the central and lateral compartments of the neck, closely associated with the thyroid gland, trachea, and recurrent laryngeal nerves. They are divided into:

  • Central (pretracheal, paratracheal, and prelaryngeal) lymph nodes – situated anterior and lateral to the trachea and thyroid isthmus, extending from the thyroid cartilage to the sternal notch.

  • Lateral (deep cervical) lymph nodes – located along the internal jugular vein and carotid sheath, receiving drainage from the thyroid lobes and surrounding structures.

These nodes play a crucial role in draining lymph from the thyroid gland, parathyroids, larynx, and adjacent cervical tissues. Normal thyroid lymph nodes are small (typically <1 cm), oval, and soft, often difficult to visualize unless enlarged.

Synonyms

  • Cervical thyroid lymph nodes

  • Central neck lymph nodes

  • Pretracheal and paratracheal nodes

  • Deep cervical thyroid nodes

Function

  • Drain lymph from the thyroid gland, parathyroids, and nearby cervical structures

  • Participate in immune surveillance, trapping pathogens, inflammatory cells, and malignant cells

  • Serve as key indicators of thyroid pathology, including thyroiditis, infection, and metastatic spread from thyroid carcinoma

  • Maintain lymphatic flow from central and lateral neck compartments

MRI Appearance

T1-weighted images:

  • Normal thyroid lymph nodes appear as small, oval, hypointense to intermediate signal structures within the neck fat

  • Surrounded by hyperintense subcutaneous or parapharyngeal fat, which provides clear contrast

  • Enlarged or pathological nodes may show cortical thickening, irregular margins, or signal heterogeneity

T1 Post-Contrast (Gadolinium-enhanced):

  • Normal nodes may show mild homogeneous enhancement of the cortex

  • Pathological nodes (inflammatory or metastatic) typically demonstrate strong homogeneous or heterogeneous enhancement, highlighting cortical and hilum differentiation

  • Post-contrast imaging is essential for detecting metastatic thyroid carcinoma and differentiating reactive versus pathological nodes

T2-weighted images:

  • Nodes are intermediate to slightly hyperintense, with surrounding fat appearing bright

  • Useful for identifying edema, cystic changes, or necrosis within nodes

  • Fatty hilum, if preserved, appears slightly hyperintense relative to cortex

STIR (Short Tau Inversion Recovery):

  • Suppresses fat signal, highlighting edema, inflammation, or metastatic infiltration

  • Normal nodes remain low to intermediate signal, whereas pathological nodes appear hyperintense

  • Highly sensitive for early lymphadenopathy detection

CT Appearance:

  • Thyroid lymph nodes appear as small, soft tissue density structures adjacent to the thyroid, trachea, and carotid sheath

  • Surrounded by hypodense fat planes, providing natural contrast

  • Pathological nodes appear as enlarged, rounded, or irregular soft tissue masses, sometimes with central necrosis or calcification

  • CT is particularly useful for preoperative mapping, detecting metastatic disease, and evaluating airway or vascular compression

MRI images

Thyroid lymph nodes mri axial image -img-00000-00000