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Preauricular lymph nodes

Preauricular lymph nodes are small, superficial lymph nodes located immediately anterior to the ear, along the superficial temporal and parotid region, typically overlying the parotid gland and zygomatic arch. They form part of the facial lymphatic chain and receive lymphatic drainage primarily from the lateral portions of the eyelids, temporal region, lateral face, and occasionally the scalp. Preauricular nodes then drain into the superficial and deep parotid lymph nodes and ultimately the cervical lymphatic system. They are usually 1–4 mm in size and may become palpable in response to infection, inflammation, or malignancy.

Synonyms

  • Parotid lymph nodes (superficial)

  • Anterior auricular lymph nodes

  • Lateral facial nodes

Function

  • Filter lymph from the lateral eyelids, temporal region, and lateral midface

  • Initiate immune responses by trapping pathogens and foreign particles

  • Serve as early indicators of ocular, facial, or scalp infections when enlarged

  • Drain lymph into parotid and cervical lymph nodes, maintaining facial and scalp lymphatic flow

MRI Appearance

T1-weighted images:

  • Normal preauricular nodes appear as small, oval, hypointense to intermediate signal structures within subcutaneous fat

  • Surrounded by hyperintense fat, providing contrast for identification

  • Cortical thickening or nodal enlargement may indicate inflammation or early pathology

T1 Post-Contrast (Gadolinium-enhanced):

  • Normal nodes show mild homogeneous enhancement

  • Pathological nodes may demonstrate marked homogeneous or heterogeneous enhancement, with cortical and hilar visualization

  • Useful for identifying metastatic or inflammatory involvement

T2-weighted images:

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

  • Helpful for detecting edema, infection, or tumor infiltration

  • Fatty hilum (if visible) may appear slightly hyperintense relative to cortex

STIR (Short Tau Inversion Recovery):

  • Fat suppression highlights edema, inflammation, or metastatic involvement

  • Normal nodes appear low to intermediate signal, while pathological nodes are hyperintense

  • Particularly useful for subtle or early lymphadenopathy

CT Appearance:

  • Nodes appear as small, soft tissue density structures immediately anterior to the ear, overlying the parotid gland

  • Surrounded by subcutaneous fat and adjacent air in the external auditory canal provides natural contrast

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

  • CT is excellent for assessing node size, shape, calcifications, and involvement in facial or parotid pathology

MRI images

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