Skip to main content

Spontaneous intracranial hypotension associated with cerebral venous thrombosis detected by a sudden seizure: a case report



Spontaneous intracranial hypotension (SIH) is rare but can lead to life-threatening complications including cerebral venous thrombosis (CVT). The concurrence of CVT and SIH raises questions regarding priority.

Case presentation

We present the case of a 52-year-old woman who developed sudden left-sided hemiparesis and generalized tonic-clonic seizures. She experienced progressive orthostatic headaches over the prior 2 weeks. Imaging showed thrombosis in the left transverse and sigmoid sinuses, bilateral subdural hematomas, and a cervicothoracic cerebrospinal fluid leak. Low molecular weight heparin was administered, but it was discontinued 2 days later due to subarachnoid hemorrhage. She was transferred to our hospital where an epidural blood patch was applied immediately, which resulted in complete symptom relief.


CVT is a rare complication of SIH that may result in devastating consequences. Treatment of SIH should be the primary focus. Prompt diagnosis and EBP application can result in a good outcome.


Spontaneous intracranial hypotension (SIH) is an uncommon entity, resulting from spontaneous cerebrospinal fluid (CSF) leak. Although its primary clinical feature is orthostatic headache, other reported symptoms include cervical pain, dizziness, nausea and vomiting, hearing loss, tinnitus, diplopia, vision loss, and cranial nerve deficits [1,2,3]. Cranial magnetic resonance imaging (MRI) typically shows pachymeningeal enhancement, subdural collections, downward displacement of the cerebral tonsils, enlargement of cerebral venous structures, and pituitary hyperemia [4]. Given the variety of clinical and radiographic manifestations, SIH often goes unrecognized, and the diagnosis is often delayed.

Although generally benign, SIH can cause life-threatening CVT, which can result in subarachnoid hemorrhage and seizures [5]. Approximately one third of patients with CVT develop focal or generalized seizures prior to diagnosis [6]; these can result in death [7, 8]. Few reports have described sudden seizure as a primary symptom of SIH with CVT[ 9,10]. When a patient presents with both SIH and CVT, a decision regarding priority of treatment is required. First-line treatment for SIH is an application of epidural blood patch (EBP); however, its indication in the setting of concurrent CVT is unknown. Here we report a complex case of SIH and associated CVT and review the literature.

Case presentation

An unconscious 52-year-old woman with a history of hypertension presented to the emergency department of an outside hospital after acute onset left-sided hemiparesis and generalized tonic-clonic seizures. She experienced progressive orthostatic headaches during the prior 2 weeks. There was no history of major trauma or lumbar puncture, and she was not taking oral contraceptives or hormonal replacement agents. Emergency cranial computed tomography (CT) showed cerebral microbleeds in the right frontal lobe (Fig. 1a). Cranial MRI with contrast showed thrombosis in the left transverse and sigmoid sinuses, bilateral subdural hematomas, and coarctation of the lateral ventricles (Fig. 1b, c). Spinal MRI with contrast revealed a cervicothoracic CSF leak (Fig. 1d). SIH associated with bilateral subdural hematomas and CVT was diagnosed, and intravenous low molecular weight heparin therapy was initiated; the CVT resolved within a few hours.

Fig. 1

a Axial cranial CT showing microbleeds in the right frontal lobe (arrow). b Axial cranial MRI showing subdural hematomas (arrow). c Axial cranial MRI with contrast showing thrombosis in the left transverse and sigmoid sinuses and narrow lateral ventricle (arrows). d Postmyelography CT showing a cervical CSF leak into the epidural space (arrows). CSF, cerebrospinal fluid; CT, computed tomography; MRI, magnetic resonance imaging

Two days later, the patient’s left face and left arm became numb. Cranial CT showed subarachnoid hemorrhage; thus, heparin was discontinued. She then developed left-sided involuntary movements and acute worsening of the hemiparesis the next day. Heparin was initiated as worsening thrombosis was suspected.

At this point, the patient was transferred to our hospital for further treatment. On arrival, her neurologic examination was unremarkable except for left-sided muscle weakness. Cranial MRI with contrast showed diffuse pachymeningeal enhancement, enlarged pituitary gland, and diffuse cerebral edema (Fig. 2a–c). Although spinal MRI showed an anterior epidural T4-T10 fluid collection, no clear site of CSF leakage was visualized (Fig. 2d). Heparin was discontinued the next day in anticipation of EBP placement.

Fig. 2

a Coronal T1-weighted gadolinium-enhanced MRI showing diffuse pachymeningeal enhancement and cortical vein thrombosis (arrows). b Sagittal T1-weighted MRI showing enlargement of the pituitary gland (arrow head) and cortical vein thrombosis (arrow). c Axial cranial MRI showing cerebral edema. d Spinal MRI showing anterior epidural fluid collection at the level of the T4–T10 spinal canal (arrow). MRI, magnetic resonance imaging

An EBP was placed via multiple interlaminar injections using a 22-gauge Tuohy needle (Unisis Corp, Tokyo, Japan) under fluoroscopy. After successful loss of resistance, a small volume of contrast medium (Isovist Inj. 240; Bayer, Leverkusen, Germany) was injected to fluoroscopically confirm epidural spread. It was difficult to identify the leakage site; approximately 52 mL of contrast medium and sterile autologous blood mixture (1:4) was injected separately under fluoroscopy at the T1–T2 and T12–L1 levels, which are considered as the most frequent sites. The injection was stopped when the patient began to note tightness in her shoulder. Epidural blood dissemination was subsequently evaluated by spinal CT (Fig. 3). The EBP resulted in improvement of muscle power and headache by the second day after treatment. Intravenous heparin was started 6 h later, and the patient was converted to oral warfarin (6-month course). At the 3- and 6- month follow-up visits, she reported no further headache episodes and had no focal neurologic deficits. Follow-up MRI at 3 months showed recanalization of the thrombosed venous sinuses (Fig. 4).

Fig. 3

Sagittal cervicothoracic spinal MRI showing hyperintense epidural fluid collection (arrows) indicating sealing of the leakage site. MRI, magnetic resonance imaging

Fig. 4

a Sagittal T1-weighted gadolinium-enhanced MRI. Baseline imaging shows diffuse pachymeningeal enhancement, sagging of the brain, enlargement of the pituitary gland, and coarctation of the lateral ventricles. b Imaging after EBP placement shows resolution of brain sagging, smaller pituitary gland, resolution of pachymeningeal enhancement, and resolution of lateral ventricle narrowing. EBP, epidural blood patch; MRI, magnetic resonance imaging


The association between SIH and CVT was first reported in 2005 [11]. Since then, a small number of cases have been reported. A PubMed database search in April 2019 using the terms “spontaneous intracranial hypotension,” “CSF leak,” and “cerebral venous thrombosis” identified 41 cases [4, 5, 9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36]. Table 1 presents these cases, along with the present patient (iatrogenic cases were excluded). Although the prognosis of SIH and CVT is generally good, life-threatening complications, including seizures and intracranial hemorrhage, can arise. The present patient is the third reported case of diagnosis resulting after a sudden seizure.

Table 1 Clinical and radiologic data for 42 patients with CVT

Although CVT affects only approximately 5 persons per million (0.0005%) in the general population [37], the prevalence among patients with SIH increases to 2% [5]. Several SIH pathophysiological mechanisms play a role in CVT development. First, the Monro-Kellie doctrine states that a loss of one component must be compensated by an increase in another in a closed compartment such as the intracranial and spinal subdural space [38]. Therefore, any loss of CSF is replaced by an increase in the most readily expansible component, which is venous blood. Subsequently, venous engorgement results in the slowing of venous blood flow. Given that patients with SIH likely lose more CSF than those undergoing lumbar puncture, the decreased blood flow velocity in patients with SIH is likely greater.

Second, the downward sagging of intracranial structures due to the loss of CSF buoyancy [1] causes traction on cerebral veins and sinuses [4], which leads to venous flow turbulence or stasis. Third, the loss of CSF decreases CSF absorption into the cerebral venous sinuses, leading to an increase in cerebral venous blood viscosity [39]. Therefore, the occurrence of this rare condition is unpredictable and results in outcomes ranging from complete remission to severe disability or death.

Both SIH and CVT are frequently misdiagnosed, which results in treatment delay and increased risk of complications. The present case highlights the importance of prompt imaging and aggressive treatment. However, in our literature review (including this case), many patients received an incorrect initial diagnosis despite MRI results evidencing SIH in 38 patients (90%) and CVT in 36 patients (86%) (Table 1). In addition, 28 patients (67%) reported a small or sudden change in their headache pattern. None of the patients had clinical or radiographic evidence of CVT preceding the development of SIH. Twelve cases (29%) presented with seizures (Table 1); however, only 3 (7%) had seizures as a primary symptom (present patient, [10, 11]). We found no features that predicted seizures other than headache, which is almost always the primary symptom of SIH. Therefore, it is important to closely monitor patients for any change in headache pattern.

In most reports, CVT was treated with anticoagulation (Table 1). The current consensus regarding CVT treatment with anticoagulation is based on 2 small randomized studies that concluded that it is safe and is associated with decreased risk of death and disability [40, 41]. However, anticoagulation theoretically increases the risk of bleeding and subdural hematoma (SDH) development, which is a concern in patients with SIH. Although the development or worsening of intracranial hemorrhage may not be entirely attributable to anticoagulation, 5 patients (12%) in our literature review developed SDH or SDH enlargement after treatment, and 2 (5%) developed intracranial hemorrhage or worsening of intracranial hemorrhage (Table 1); the patient with worsened intracranial hemorrhage died. Consequently, the benefit of anticoagulation should always be weighed against the risk of SDH, especially when subdural fluid collections are present [20].

The mainstay of SIH treatment is EBP placement; however, its effect on venous thrombosis development and recanalization is unknown. We hypothesized that the primary treatment focus should be SIH, given that CVT development is closely related to SIH-induced pathophysiologic changes in the brain. Thus, we prioritized EBP placement, even though the present patient had anticoagulation initiated at another hospital. In our literature review (including the present case), of the 34 patients who received anticoagulation therapy, 14 of 21 (67%) who did not receive an EBP had a complete neurologic recovery; in contrast, 11 of 13 (85%) who received an EBP recovered completely. Seven patients underwent EBP without anticoagulation, and all completely recovered. These data suggest that EBP application might be warranted for consideration as first-line therapy.

There are several limitations of this literature review. It was retrospective in nature and examined only 42 cases due to the low prevalence of SIH and CVT. Moreover, anticoagulation therapy and EBP application were not performed in the same manner across studies, although treatments likely improved over time.


We report a complex case of SIH associated with CVT, a rare complication with potential severe neurologic and life-threatening consequences. It is difficult to prevent sudden seizures before diagnosis; if seizures occur, immediate advanced diagnostic imaging should be performed along with supportive neurologic care. We believe that the primary focus of treatment should be directed at SIH, given that the underlying CVT cause is closely related to the pathophysiologic changes that occur after SIH. Prompt diagnosis and treatment with EBP application can result in a good outcome, as in the present case. Although the prevalence of SIH with CVT is low, rendering case-controlled studies impractical, additional studies are needed to determine an algorithm for early diagnosis and treatment.

Availability of data and materials

Not applicable.



Cerebrospinal fluid


Computed tomography


Cerebral venous thrombosis


Epidural blood patch


Magnetic resonance imaging


Subdural hematoma


Spontaneous intracranial hypotension


  1. 1.

    Schievink WI. Spontaneous spinal cerebrospinal fluid leaks and intracranial hypotension. JAMA. 2006;295:2286–96.

    CAS  PubMed  Google Scholar 

  2. 2.

    Mokri B. Spontaneous low pressure, low CSF volume headaches: spontaneous CSF leaks. Headache. 2013;53:1034–53.

    PubMed  Google Scholar 

  3. 3.

    Bassani L, Graffeo CS, Behrooz N, et al. Noninvasive diagnosis and management of spontaneous intracranial hypotension in patients with Marfan syndrome: case report and review of the literature. Surg Neurol Int. 2014;5:8.

    PubMed  PubMed Central  Google Scholar 

  4. 4.

    Haritanti A, Karacostas D, Drevelengas A, et al. Spontaneous intracranial hypotension: clinical and neuroimaging findings in six cases with literature review. Eur J Radiol. 2009;69:253–9.

    CAS  PubMed  Google Scholar 

  5. 5.

    Schievink WI, Maya MM. Cerebral venous thrombosis in spontaneous intracranial hypotension. Headache. 2008;48:1511–9.

    PubMed  Google Scholar 

  6. 6.

    Ferro JM, Canhão P, Bousser MG, Stam J, Barinagarrementeria F, ISCVT Investigators. Early seizures in cerebral vein and dural sinus thrombosis: risk factors and role of antiepileptics. Stroke. 2008;39:1152–8.

    PubMed  Google Scholar 

  7. 7.

    Ferro JM, Correia M, Rosas MJ, Pinto AN, Neves G, Cerebral Venous Thrombosis Portuguese Collaborative Study Group [Venoport]. Seizures in cerebral vein and dural sinus thrombosis. Cerebrovasc Dis. 2003;15:78–83.

    CAS  PubMed  Google Scholar 

  8. 8.

    Masuhr F, Busch M, Amberger N, et al. Risk and predictors of early epileptic seizures in acute cerebral venous and sinus thrombosis. Eur J Neurol. 2006;13:852–6.

    CAS  PubMed  Google Scholar 

  9. 9.

    Rozen TD. Pachymeningeal enhancement detected on MRI: a venous phenomena not always related to intracranial hypotension (resolving pachymeningeal enhancement and cerebral vein thrombosis). Headache. 2013;53:673–5.

    PubMed  Google Scholar 

  10. 10.

    Lai PH, Li JY, Lo YK, Wu MT, Liang HL, Chen CK. A case of spontaneous intracranial hypotension complicated by isolated cortical vein thrombosis and cerebral venous infarction. Cephalalgia. 2007;27:87–90.

    PubMed  Google Scholar 

  11. 11.

    Flemming KD, Link MJ. Spontaneous CSF leak complicated by venous thrombosis and dural arteriovenous fistula. Cephalalgia. 2005;25:751–3.

    CAS  PubMed  Google Scholar 

  12. 12.

    Berroir S, Grabli D, Héran F, Bakouche P, Bousser MG. Cerebral sinus venous thrombosis in two patients with spontaneous intracranial hypotension. Cerebrovasc Dis. 2004;17:9–12.

    PubMed  Google Scholar 

  13. 13.

    Sopelana D, Marcos A, Arroyo R, et al. May intracranial hypotension be a cause of venous sinus thrombosis? Eur Neurol. 2004;51:113–5.

    CAS  PubMed  Google Scholar 

  14. 14.

    Savoiardo M, Armenise S, Spagnolo P, et al. Dural sinus thrombosis in spontaneous intracranial hypotension: hypotheses on possible mechanisms. J Neurol. 2006;253:1197–202.

    PubMed  Google Scholar 

  15. 15.

    Richard S, Kremer S, Lacour JC, Vespignani H, Boyer P, Ducrocq X. Cerebral venous thrombosis caused by spontaneous intracranial hypotension: two cases. Eur J Neurol. 2007;14:1296–8.

    CAS  PubMed  Google Scholar 

  16. 16.

    Tan K, Venketasubramanian N, Hwang CY, Lim CC. My headache does not get better when I lie down: spontaneous intracranial hypotension complicated by venous thrombosis. Headache. 2008;48:149–52.

    PubMed  Google Scholar 

  17. 17.

    Ivanidze J, Zimmerman RD, Sanelli PC. Spontaneous intracranial hypotension followed by dural sinus thrombosis: a case report. Clin Neurol Neurosurg. 2010;112:498–500.

    PubMed  Google Scholar 

  18. 18.

    Nardone R, Caleri F, Golaszewski S, et al. Subdural hematoma in a patient with spontaneous intracranial hypotension and cerebral venous thrombosis. Neurol Sci. 2010;31:669–72.

    PubMed  Google Scholar 

  19. 19.

    Dangra VR, Sharma YB, Bharucha NE, Deopujari CE. An interesting case of headache. Ann Indian Acad Neurol. 2011;14:130–2.

    PubMed  PubMed Central  Google Scholar 

  20. 20.

    Mao YT, Dong Q, Fu JH. Delayed subdural hematoma and cerebral venous thrombosis in a patient with spontaneous intracranial hypotension. Neurol Sci. 2011;32:981–3.

    PubMed  Google Scholar 

  21. 21.

    Ferrante T, Latte L, Abrignani G, Russo M, Manzoni GC, Torelli P. Cough headache secondary to spontaneous intracranial hypotension complicated by cerebral venous thrombosis. Neurol Sci. 2012;33:429–33.

    CAS  PubMed  Google Scholar 

  22. 22.

    Costa P, Del Zotto E, Giossi A, et al. Headache due to spontaneous intracranial hypotension and subsequent cerebral vein thrombosis. Headache. 2012;52:1592–6.

    PubMed  Google Scholar 

  23. 23.

    Tian CL, Pu CQ. Dural enhancement detected by magnetic resonance imaging reflecting the underlying causes of cerebral venous sinus thrombosis. Chin Med J (Engl). 2012;125:1513–6.

    Google Scholar 

  24. 24.

    Rice CM, Renowden SA, Sandeman DR, Cottrell DA. Spontaneous intracranial hypotension and venous sinus thrombosis. Pract Neurol. 2013;13:120–4.

    PubMed  Google Scholar 

  25. 25.

    Fujii N, Fujii H, Fujita A, Kim Y, Sugimoto H. Spontaneous intracranial hypotension complicated by cerebral venous thrombosis. Radiol Case Rep. 2018;13:834–8.

    PubMed  PubMed Central  Google Scholar 

  26. 26.

    Wang YF, Fuh JL, Lirng JF, Chang FC, Wang SJ. Spontaneous intracranial hypotension with isolated cortical vein thrombosis and subarachnoid haemorrhage. Cephalalgia. 2007;27:1413–7.

    PubMed  Google Scholar 

  27. 27.

    Takeuchi S, Takasato Y, Masaoka H, et al. Spontaneous intracranial hypotension associated with dural sinus thrombosis. Neurol Med Chir (Tokyo). 2007;47:555–8.

    Google Scholar 

  28. 28.

    Yoon KW, Cho MK, Kim YJ, Lee SK. Sinus thrombosis in a patient with intracranial hypotension: a suggested hypothesis of venous stasis. A case report. Interv Neuroradiol. 2011;17:248–51.

    PubMed  PubMed Central  Google Scholar 

  29. 29.

    Zhang D, Wang J, Zhang Q, He F, Hu X. Cerebral venous thrombosis in spontaneous intracranial hypotension: a report on 4 cases and a review of the literature. Headache. 2018;58:1244–55.

    PubMed  Google Scholar 

  30. 30.

    Kataoka H, Tanizawa E, Ueno S. Spontaneous intracranial hypotension is associated with a risk of venous sinus thrombosis and subdural hematoma. Cerebrovasc Dis. 2007;23:315–7.

    PubMed  Google Scholar 

  31. 31.

    Albayram S, Tasmali KM, Gunduz A. Can spontaneous intracranial hypotension cause venous sinus thrombosis? J Headache Pain. 2007;8:200–1.

    PubMed  PubMed Central  Google Scholar 

  32. 32.

    Ade S, Moonis M. Intracranial hypotension with multiple complications: an unusual case report. Case Rep Neurol Med. 2013;2013:913465.

    PubMed  PubMed Central  Google Scholar 

  33. 33.

    Garcia-Carreira MC, Vergé DC, Branera J, et al. Cerebral venous thrombosis in two patients with spontaneous intracranial hypotension. Case Rep Neurol Med. 2014;2014:528268.

    CAS  PubMed  PubMed Central  Google Scholar 

  34. 34.

    Sinnaeve L, Vanopdenbosch L, Paemeleire K. Association of cerebral venous thrombosis and intracranial hypotension: review of 3 cases. J Stroke Cerebrovasc Dis. 2017;26:e165–9.

    PubMed  Google Scholar 

  35. 35.

    Perry A, Graffeo CS, Brinjikji W, Copeland WR, Rabinstein AA, Link MJ. Spontaneous occult intracranial hypotension precipitating life-threatening cerebral venous thrombosis: case report. J Neurosurg Spine. 2018;28:669–78.

    PubMed  Google Scholar 

  36. 36.

    Lan MY, Chang YY, Liu JS. Delayed cerebral venous thrombosis in a patient with spontaneous intracranial hypotension. Cephalalgia. 2007;27:1176–8.

    PubMed  Google Scholar 

  37. 37.

    Stam J. Thrombosis of the cerebral veins and sinuses. N Engl J Med. 2005;352:1791–8.

    CAS  PubMed  Google Scholar 

  38. 38.

    Mokri B. The Monro-Kellie hypothesis: applications in CSF volume depletion. Neurology. 2001;56:1746–8.

    CAS  PubMed  Google Scholar 

  39. 39.

    Park JH, Yoon SH. New concept of cerebrospinal fluid dynamics in cerebral venous sinus thrombosis. Med Hypotheses. 2008;70:143–7.

    PubMed  Google Scholar 

  40. 40.

    de Bruijn SF, Stam J. Randomized, placebo-controlled trial of anticoagulant treatment with low-molecular-weight heparin for cerebral sinus thrombosis. Stroke. 1999;30:484–8.

    PubMed  Google Scholar 

  41. 41.

    Einhaupl KM, Villringer A, Meister W, et al. Heparin treatment in sinus venous thrombosis. Lancet. 1991;338:597–600.

    CAS  PubMed  Google Scholar 

Download references


Not applicable.



Author information




YA helped draft the manuscripts. SU helped revise the manuscripts. The authors read and approved the final manuscript.

Corresponding author

Correspondence to Yoshiyasu Hattammaru.

Ethics declarations

Ethics approval and consent to participate

Not applicable.

Consent for publication

Written informed consent was obtained from the subject for publication of this case report and accompanying images.

Competing interests


Additional information

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Yamamoto, A., Hattammaru, Y. & Uezono, S. Spontaneous intracranial hypotension associated with cerebral venous thrombosis detected by a sudden seizure: a case report. JA Clin Rep 6, 59 (2020).

Download citation


  • Spontaneous intracranial hypotension
  • Cerebral venous thrombosis
  • Epidural blood patch