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Retropharyngeal lymph nodes

Retropharyngeal lymph nodes are a group of deep cervical lymph nodes located in the retropharyngeal space, posterior to the pharyngeal wall and anterior to the prevertebral fascia. They extend from the base of the skull down to the level of C2–C4 vertebrae, and are divided into medial and lateral groups, with the lateral nodes being larger and clinically significant. These nodes primarily drain the nasopharynx, oropharynx, posterior nasal cavity, paranasal sinuses, and middle ear, and eventually communicate with deep cervical lymph nodes, especially the jugulodigastric and spinal accessory chains. In adults, the nodes are often small and not palpable, but they may enlarge significantly in infection, inflammation, or metastatic disease, particularly from nasopharyngeal carcinoma or upper respiratory tract infections.

Synonyms

  • Retropharyngeal nodes

  • Lateral retropharyngeal lymph nodes

  • Nodes of Rouvière (lateral group)

  • Deep cervical posterior nodes

Function

  • Drain lymph from the nasopharynx, oropharynx, posterior nasal cavity, paranasal sinuses, and middle ear

  • Act as an early site for metastatic spread from nasopharyngeal, oropharyngeal, and sinonasal malignancies

  • Participate in immune surveillance of the upper aerodigestive tract

  • Communicate with deep cervical lymph nodes, maintaining lymphatic flow

MRI Appearance

T1-weighted images:

  • Retropharyngeal lymph nodes appear as small, oval, low-to-intermediate signal intensity structures within the retropharyngeal fat

  • Surrounded by hyperintense fat, which provides natural contrast

  • Enlarged nodes may appear rounded with cortical thickening

T1 Post-Contrast (Gadolinium-enhanced):

  • Normal nodes show mild homogeneous enhancement

  • Enlarged, inflamed, or metastatic nodes demonstrate marked homogeneous or heterogeneous enhancement, highlighting the cortex and sometimes the fatty hilum

  • Essential for detection of occult metastasis or abscess formation

T2-weighted images:

  • Nodes demonstrate intermediate to slightly hyperintense signal, while surrounding fat is bright

  • Useful for identifying edema, necrosis, or infiltration

  • Necrotic centers (in metastatic or abscessed nodes) appear hyperintense centrally with hypointense rim

STIR (Short Tau Inversion Recovery):

  • Fat suppression enhances detection of edema or pathological enlargement

  • Normal nodes are low to intermediate signal, whereas inflamed or metastatic nodes appear hyperintense

  • Particularly sensitive for detecting subtle retropharyngeal lymphadenopathy

CT Appearance:

  • Retropharyngeal lymph nodes appear as small, oval soft tissue density structures within the retropharyngeal space, posterior to the pharyngeal wall and anterior to the prevertebral muscles

  • Surrounding air in the pharyngeal lumen appears hypodense, providing contrast

  • Enlarged or pathological nodes appear as well-defined or irregular soft tissue masses, sometimes with central low density in necrotic nodes

  • CT is especially valuable for evaluating abscess formation, airway compromise, trauma, or metastatic spread

MRI images

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

MRI images

Retropharyngeal lymph nodes mri axial image -img-00000-00000_00001

MRI images

Retropharyngeal lymph nodes mri axial image -img-00000-00000_00002