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Mandibular lymph nodes

Mandibular lymph nodes are a group of superficial and deep lymph nodes located along the mandible, forming a key part of the facial and cervical lymphatic network. The superficial mandibular nodes are positioned just inferior to the body of the mandible, along the external border of the mandible, embedded within the subcutaneous tissue overlying the masseter and platysma muscles. The deep mandibular nodes lie medial to the mandible, along the facial vessels, often adjacent to the submandibular gland.

These lymph nodes receive lymphatic drainage from the lower lip, chin, anterior portion of the tongue, floor of mouth, teeth, and gingiva, and they drain into the deep cervical lymph nodes. Normal nodes are typically small (3–10 mm), soft, and non-palpable, becoming prominent in response to infection, inflammation, or metastatic disease.

Synonyms

  • Submandibular lymph nodes

  • Mandibular facial nodes

  • Facial chain nodes

  • Submandibular chain nodes

Function

  • Filter lymph from the lower lip, chin, anterior tongue, floor of mouth, and mandible

  • Participate in immune surveillance of the oral cavity and lower face

  • Drain into deep cervical nodes, maintaining lymphatic flow from the lower face

  • Serve as an early indicator of infection, inflammation, or malignancy in the mandibular and oral region

MRI Appearance

T1-weighted images:

  • Normal mandibular nodes appear as small, oval, hypointense to intermediate signal structures within subcutaneous fat or soft tissue

  • Surrounded by hyperintense fat, allowing clear visualization

  • Pathological nodes may appear enlarged, rounded, or with cortical thickening

T1 Post-Contrast (Gadolinium-enhanced):

  • Normal nodes may show mild homogeneous enhancement

  • Inflamed or metastatic nodes exhibit marked homogeneous or heterogeneous enhancement, often highlighting the cortex and sometimes the fatty hilum

  • Post-contrast imaging is crucial for detecting early metastases or active inflammation

T2-weighted images:

  • Nodes show intermediate to slightly hyperintense signal, contrasting with bright surrounding fat

  • Useful for assessing edema, inflammatory changes, or tumor infiltration

  • Fatty hilum, if present, appears slightly hyperintense relative to node cortex

STIR (Short Tau Inversion Recovery):

  • Fat suppression highlights edema or pathological changes

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

  • Particularly sensitive for detecting subtle lymphadenopathy in soft tissue

CT Appearance:

  • Nodes appear as small, soft tissue density structures along the inferior border and medial aspect of the mandible

  • Surrounded by subcutaneous fat, which provides natural contrast

  • Enlarged or pathological nodes appear as well-defined or irregular soft tissue masses

  • CT is especially useful for assessing mandibular fractures, infection, metastatic disease, or preoperative surgical planning

MRI images

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