Diagnosis and Management of Dural Venous Sinus Thrombosis Secondary to Mastoiditis

Epidemiology & Risk Factors

In pediatric patients with otogenic sinus thrombosis, the lateral (sigmoid / transverse) sinuses are involved in ≈ 73 % of cases, whereas the superior sagittal sinus is affected in ≈ 35 %【1】.
Hemorrhagic venous infarction occurs more frequently in neonates (≈ 72 %) than in older children (≈ 48 %)【1】.
Over 50 % of children with otogenic sinus thrombosis have an underlying pro‑thrombotic disorder, supporting routine thrombophilia screening【1】.
Between 33 % and 81 % of mastoiditis patients had received prior antibiotics for acute otitis media, indicating that recent antibiotic use does not exclude the diagnosis【2】.
Brain abscess remains the most common intracranial complication of otitis media, with an estimated incidence of 1 per million per year【2】.

MRI with gadolinium‑enhanced MR venography (MRV) is the preferred diagnostic modality for detecting dural venous sinus thrombosis and associated intracranial complications; it outperforms CT in visualizing venous infarction/hemorrhage (25 % detected on MRI vs 8 % on CT)【3】【4】.
Gradient‑echo T1‑weighted post‑contrast MRI provides 92.5 % sensitivity and 100 % specificity for dural venous sinus thrombosis【1】 (high‑level diagnostic accuracy).
The classic “empty delta sign” (central hypodensity with peripheral enhancement) is reliably visualized on contrast‑enhanced MRI/CT and aids in confirming sinus thrombosis【3】【5】.
When MRI is unavailable or contraindicated, CT venography (CTV) with intravenous contrast is an acceptable alternative, demonstrating lack of contrast filling in the occluded sinus【3】【1】.
A high‑resolution contrast‑enhanced CT of the temporal bone should be performed first to confirm mastoiditis and evaluate for bony erosion of the tegmen or sinus wall【3】.

Therapeutic anticoagulation is the cornerstone of treatment and should be initiated even when hemorrhagic venous infarction is present, as intracerebral hemorrhage secondary to the thrombosis is not a contraindication【6】【5】.
The American Heart Association/American Stroke Association issues a strong recommendation for anticoagulation to prevent thrombus propagation and promote recanalization in cerebral venous sinus thrombosis【6】【5】.
Systematic reviews (Cochrane) and the European Paediatric Neurology Society conclude that anticoagulation is safe and reasonable in otogenic sinus thrombosis absent specific contraindications【2】.
Recommended duration of anticoagulation ranges from 3 – 12 months, extending to lifelong therapy when persistent thrombophilia or recurrent thrombosis is identified【5】.

Endovascular therapy (e.g., catheter‑directed thrombolysis or mechanical thrombectomy) may be considered for patients with absolute contraindications to anticoagulation or those who fail to improve on initial anticoagulant therapy【6】【5】.

Control MRI with contrast should be obtained 7‑14 days after surgical or medical intervention to assess recanalization and detect secondary complications such as brain abscess formation【2】.

The American College of Radiology recommends a stepwise approach for treating mastoid disease identified on CT scan, beginning with intravenous broad-spectrum antibiotics, with surgical intervention reserved for cases that fail to improve after 48 hours of medical therapy or show evidence of complications 7
CT findings of mastoid disease require prompt intervention as this represents a complication of acute otitis media with potential for serious morbidity and mortality, according to the American Academy of Otolaryngology-Head and Neck Surgery 8, 7
Initial treatment should include myringotomy with or without tympanostomy tube placement to provide drainage and obtain cultures, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 8

The American Academy of Otolaryngology-Head and Neck Surgery recommends high-dose amoxicillin-clavulanate as an alternative option for antibiotic regimens 8
Close monitoring for clinical improvement is essential during the first 48 hours of treatment, according to the American College of Radiology 7

Surgical management is indicated in cases that fail to improve after 48 hours of appropriate intravenous antibiotic therapy, as recommended by the American College of Radiology 7
The American Academy of Otolaryngology-Head and Neck Surgery indicates surgical management for presence of subperiosteal abscess, though some may be managed with needle aspiration 8
Evidence of intracranial complications on imaging, such as brain abscess or meningitis, requires surgical intervention, according to the American College of Radiology 7, 9

For intracranial complications, MRI with contrast is superior to CT for evaluation of intracranial spread, as recommended by the American College of Radiology 7, 10
The American Academy of Otolaryngology-Head and Neck Surgery suggests anticoagulation may be considered for sigmoid sinus thrombosis in the absence of contraindications 8

Despite prior antibiotic treatment for acute otitis media, mastoiditis can still develop, with 33-81% of mastoiditis cases having received antibiotics previously, according to the American Academy of Otolaryngology-Head and Neck Surgery 8
Cultures from mastoid infections may be negative in up to 33-53% of cases, emphasizing the importance of broad-spectrum empiric coverage, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 8