Glomus jugulare is a paraganglioma located in the jugular foramen region — the most common locally aggressive benign tumor of the temporal bone. It originates from glomus bodies (chemoreceptor paraganglion cells) at the jugular bulb. Jugular fossa bone erosion (moth-eaten pattern) is pathognomonic. Classic salt-and-pepper pattern and avid heterogeneous enhancement on MRI. Lower cranial nerve involvement (CN IX, X, XI, XII) and extension into the middle ear in large tumors (glomus jugulotympanicum). 3-6 times more common in women, presents in middle age and above. Hereditary multiple paraganglioma may develop in SDH gene mutation carriers.
Age Range
40-70
Peak Age
55
Gender
Equal
Prevalence
Rare
Glomus jugulare originates from paraganglion cells (glomus bodies) located in the adventitia of the jugular bulb. These cells are of neural crest origin and have oxygen/CO2-sensitive chemoreceptor function. The tumor shows locally aggressive growth — bone erosion occurs through proteolytic enzymes (metalloproteinases) and chronic pressure effect. Moth-eaten pattern (multiple irregular bone defects) in the jugular plate and jugular foramen bone wall is pathognomonic. The tumor's intense vascularity is related to hypertrophy of feeding arteries (ascending pharyngeal artery, posterior auricular artery branches) and intratumoral AV shunts — creating the salt-and-pepper pattern on MRI. Growth directions: (1) superior — extension into middle ear (glomus jugulotympanicum), (2) inferior — extension into neck, (3) medial — brainstem compression, (4) anterior — carotid canal invasion. Lower cranial nerve involvement (IX: dysphagia, X: hoarseness, XI: shoulder drop, XII: tongue deviation) results from compression and invasion of nerve structures around the jugular foramen.
Multiple irregular bone defects in the jugular plate (moth-eaten pattern) are pathognomonic for glomus jugulare. Combined with salt-and-pepper pattern on MRI, it confirms the diagnosis. This combination is not seen in any other jugular foramen mass.
On HRCT, multiple irregular bone defects (moth-eaten pattern) are seen in the jugular plate and jugular fossa bone wall. This erosion pattern is pathognomonic for glomus jugulare. The normal jugular plate is a smooth, continuous thin bone layer; in moth-eaten pattern this continuity is disrupted and tumor spreads between jugular bulb and middle ear. Erosion extent correlates with tumor size. In advanced cases, carotid canal bone wall may also be eroded.
Report Sentence
Moth-eaten pattern bone erosion of the right/left jugular fossa is seen, consistent with glomus jugulare.
On contrast MRI, glomus jugulare shows avid heterogeneous enhancement. Salt-and-pepper pattern is prominent: on T1 and T2, high-flow arteries create flow voids (hypointense dots) while tumor parenchyma shows intermediate-high signal. On contrast sequences, tumor tissue enhances avidly while flow voids do not. Heterogeneous enhancement reflects mixture of necrotic/cystic areas and vascular structures.
Report Sentence
A mass showing salt-and-pepper pattern with avid heterogeneous enhancement in the right/left jugular foramen region is seen, consistent with glomus jugulare.
On arterial phase contrast CT, an avidly enhancing mass is seen in the jugular foramen region. This combination with bone erosion confirms glomus jugulare diagnosis. Tumor boundaries, carotid canal relationship, and intracranial extension are evaluated with contrast CT. CT angiography may show tumor vascular supply.
Report Sentence
An avidly enhancing mass with moth-eaten bone erosion in the jugular foramen region is seen, consistent with glomus jugulare.
On T2-weighted sequences, glomus jugulare shows heterogeneous signal. Tumor tissue produces intermediate-high signal while multiple flow voids are seen as prominent hypointense dots — the T2 component of the salt-and-pepper pattern. Peritumoral edema or brainstem compression signs are evaluated. High-resolution T2 sequences (3D CISS) show relationship with lower cranial nerves.
Report Sentence
A mass showing heterogeneous signal with prominent flow voids in the jugular foramen region is seen on T2 sequences.
In large glomus jugulare tumors, superior extension into the middle ear through jugular plate erosion is seen — then classified as glomus jugulotympanicum. On contrast MRI, a continuously enhancing mass extending from the jugular foramen region into the middle ear cavity is seen. The middle ear component settles on the promontory and may mimic glomus tympanicum — but jugular plate erosion differentiates these two tumors.
Report Sentence
The mass in the jugular foramen region shows superior extension into the middle ear through jugular plate erosion, consistent with glomus jugulotympanicum.
Criteria
Tumor confined to middle ear and mastoid, minimal jugular bulb involvement.
Distinct Features
Surgical excision relatively easy, facial nerve can be preserved, embolization usually not needed.
Criteria
Jugular foramen erosion prominent, carotid canal involvement possible (Type C). Brainstem compression may begin.
Distinct Features
Preoperative embolization mandatory, lower cranial nerve palsy risk, multidisciplinary surgery.
Criteria
Intradural/intracranial extension, >2cm intracranial component. Brainstem compression.
Distinct Features
Surgery very complex, subtotal resection + radiotherapy, high morbidity.
Distinguishing Feature
Glomus tympanicum has intact jugular plate, small mass on promontory; jugulare has jugular plate erosion, larger, lower cranial nerves affected
Distinguishing Feature
Schwannoma has homogeneous enhancement in IAC, no salt-and-pepper; jugulare has jugular foramen erosion + salt-and-pepper + heterogeneous
Distinguishing Feature
Cholesteatoma does not enhance + bright DWI; glomus jugulare enhances avidly + DWI negative + salt-and-pepper
Urgency
urgentManagement
surgicalBiopsy
Not NeededFollow-up
6-monthGlomus jugulare is treated with surgery and/or radiotherapy. Preoperative embolization (usually 24-48 hours before surgery) significantly reduces intraoperative bleeding and is standard practice. BIOPSY CONTRAINDICATED — risk of massive hemorrhage! Lower cranial nerve function must be assessed preoperatively (swallowing, voice, shoulder strength, tongue movement). SDH gene mutation screening is mandatory — multiple paragangliomas (carotid body, vagal, adrenal pheochromocytoma) must be screened. In large tumors (Fisch D), subtotal resection + stereotactic radiotherapy combination may be preferred.
Glomus jugulare is the most common locally aggressive benign tumor of the temporal bone. Its locally aggressive growth causes serious complications: lower cranial nerve paralysis, vascular invasion. Treatment: surgery (with preoperative embolization) or radiotherapy. SDH gene mutation screening and whole-body paraganglioma assessment required. Biopsy CONTRAINDICATED — risk of massive hemorrhage.