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PubMed2005

A new model of reversible sinus sagittalis superior thrombosis in the rat: magnetic resonance imaging changes.

OBJECTIVE: The causes of cerebral sinus and vein occlusion and the accompanying parenchymal changes remain largely unexplained. The clinical variability and low incidence of the disease complicate systematic clinical investigations. Animal studies are indispensable; however, existing animal models of sinus thrombosis do not allow for long-term follow-up studies and are not suitable for pharmacological recanalization because sinus thrombosis is induced by ligation and injection of thrombogenic substances and does not resemble sinus thrombosis in humans. METHODS: We induced thrombosis of the superior sagittal sinus (SSS) by careful topical application of ferric chloride onto the SSS of rats, leading to highly reproducible occlusions. Magnetic resonance imaging was performed immediately after initiation of thrombosis and on postoperative Days 1, 2, and 7. Diffusion- and T2-weighted images allowed for calculation of the apparent diffusion coefficient and T2 relaxation time. Vascular status was assessed by venous magnetic resonance angiography. Neurological deficits were assessed with the rotarod test. RESULTS: Seven days after induction of thrombosis, partial recanalization (50.7% of the SSS remaining occluded) was accompanied by a resolution of early generalized changes of the apparent diffusion coefficient and of T2 relaxation time, indicating edema of the entire brain parenchyma. Compared with sham-treated animals, clinical skills in the experimental group improved over time, which was statistically independent from the degree of recanalization. Histopathological analysis revealed no signs of cerebral infarction. CONCLUSION: This is the first animal model of SSS thrombosis that offers the possibility to investigate pathophysiological aspects of the disease as well as the influence of therapy on the nature of disease progression.

Animals↗
PubMed1990

Postpartum intracranial venous thrombosis associated with dysfunctional protein C and deficiency of protein S.

Development of intracranial dural sinus thrombosis in the postpartum period has been attributed to the hypercoagulable state of pregnancy. With increasing recognition of the role of the vitamin K-dependent proteins, protein C and protein S, in intracranial venous and arterial thrombotic events, our understanding of the cause of thrombotic events has improved. We report a patient who developed a superior sagittal sinus thrombosis in the second week postpartum, associated with a dysfunctional protein C and a decreased free protein S concentration.

Adolescent↗
PubMed1998

[Ultrasonographic imaging of superior sagittal thrombosis].

Ultrasonographic findings of superior sagittal sinus thrombosis include dilated and hyperechoic sinus (direct imaging of the thrombus). No flow should be demonstrated by the various Doppler techniques. In the deeper sinuses, if the thrombus can not be visualized after a negative Doppler study, MR imaging is recommended. Recanalization and reflow can be demonstrated on follow-up study.

Humans↗
PubMed2000

Cerebral MR venography: normal anatomy and potential diagnostic pitfalls.

BACKGROUND AND PURPOSE: MR venography is often used to examine the intracranial venous system, particularly in the evaluation of dural sinus thrombosis. The purpose of this study was to evaluate the use of MR venography in the depiction of the normal intracranial venous anatomy and its variants, to assess its potential pitfalls in the diagnosis of dural venous sinus thrombosis, and to compare the findings with those of conventional catheter angiography. METHODS: Cerebral MR venograms obtained in 100 persons with normal MR imaging studies were reviewed to determine the presence or absence of the dural sinuses and major intracranial veins. RESULTS: Systematic review of the 100 cases revealed transverse sinus flow gaps in 31% of the cases, with 90% of these occurring in the nondominant transverse sinus and 10% in the codominant transverse sinuses. No flow gaps occurred in the dominant transverse sinuses. The superior sagittal and straight sinuses were seen in every venogram; the occipital sinus was seen in only 10%. The vein of Galen and internal cerebral veins were also seen in every case; the basal veins of Rosenthal were present in 91%. CONCLUSIONS: Transverse sinus flow gaps can be observed in as many as 31% of patients with normal MR imaging findings; these gaps should not be mistaken for dural sinus thrombosis.

Adolescent↗
PubMed1982

Computed tomographic observations pertinent to intracranial venous thrombotic and occlusive disease in childhood. State of the art, some new data, and hypotheses.

Selected topics are discussed and new observations recorded regarding computed tomographic (CT) evaluation of intracranial venous thrombotic and occlusive disease in childhood. High density of the vein of Galen and adjacent venous sinuses (relative to brain) can be seen normally in children. A number of potential pitfalls in the diagnosis of superior sagittal sinus thrombosis are also disclosed. A case of cavernous sinus thrombosis with abnormal CT changes in included. In addition, the normal CT appearance of the cavernous sinus is described. In some cases, filling defects occur which appear to correlate with normal cranial nerves. An unusual case of venous sinus occlusion by neoplasm (sarcoma) is presented. Finally, new findings in the Sturge-Weber syndrome are analyzed. Enhancement of the brain in this condition may have its basis in altered circulation resulting from fundamental venous abnormalities.

Adolescent↗
PubMed1991

Eosinophilic granuloma of the occipital bone presenting as intracranial venous hypertension.

Intracranial venous sinus thrombosis is an uncommon cause of pseudotumor cerebri. The diagnosis is often not confirmed on the rationale that treatment will not be altered. We report a case presenting a pseudotumor cerebri where the underlying pathology disclosed dural sinus thrombosis resulting from compression by an eosinophilic granuloma of the occipital bone. Routine CT of the head and Technetium-99m brain scan initially demonstrated neither tumor nor thrombosis. Plain skull x-rays subsequently revealed a lytic lesion of the occiput. When reinvestigated with CT using bone density windows the tumor was revealed. Excision of the tumor and a short course of cobalt therapy was curative. Special techniques in nuclear scanning, CT and MRI designed to improve the sensitivity for diagnosing venous sinus thrombosis are described. This case illustrates the importance of establishing a definitive diagnosis and shows the importance of pre-test consultation between clinicians and radiologists to ensure that specific investigative techniques are properly utilized.

Bone Diseases↗
PubMed1993

Meningioma in sigmoid sinus groove associated with dural arteriovenous malformation: case report.

A 65-year-old woman was evaluated for vertigo. Computed tomography and magnetic resonance imaging as well as angiography revealed the coexistence of a tumor at the junction of the right transverse-sigmoid sinuses, a dural arteriovenous malformation (AVM) of the right transverse sinus, and a right sigmoid sinus thrombosis. After transarterial embolization via the external carotid artery, the tumor was totally removed and the right transverse sinus was embolized with platinum coils and Surgicel. Postoperatively, the dural AVM was completely occluded, and the histological examination of the tumor showed it to be a transitional type of meningioma. It would be suggested that the right transverse-sigmoid sinuses are involved by the meningioma to develop the sigmoid sinus thrombosis and the dural AVM of the transverse sinus, supporting an acquired origin of the dural AVM.

Aged↗
PubMed1994

Magnetic resonance imaging of thrombosed dural sinuses.

BACKGROUND AND PURPOSE: Magnetic resonance imaging should have the potential to replace angiography in the diagnosis of dural sinus thrombosis. Concerning time-dependent signal changes of the thrombus, we intended to develop a standardized examination protocol for routine use in suspected dural sinus thrombosis. METHODS: The time-dependent signal changes of thrombosed dural sinuses were studied in 23 consecutive patients by multiplanar spin-echo and flow-sensitive sequences. Signal intensities and thrombus homogeneity were graded and related to the time after clinical onset and the results of the magnetic resonance angiography. RESULTS: Four stages of the thrombus evolution could be observed. The acute thrombosis (days 1 to 5) appeared strongly hypointense in T2-weighted images and isointense in spin density- and T1-weighted images. In the subacute stage (up to day 15) the thrombus signal was strongly hyperintense in T1- and T2-weighted images. The third stage began in the third week after clinical onset. The thrombus signal was decreased in all sequences and showed an increasing inhomogeneity. The fourth (late) stage was characterized by either the restitution of blood flow or the persistence of a residual thrombus. CONCLUSIONS: Each stage requires a different diagnostic approach. With the combined use of spin-echo and gradient-echo sequences, it is possible to make the diagnosis of acute thrombosis; in the second stage, multiplanar spin-echo sequences are sufficient. Diagnosis of dural sinus thrombosis can be established accurately with magnetic resonance imaging in the first two stages. However, the diagnosis of the later stages is difficult because of inhomogeneous signs of recanalization and flow phenomena. Therefore, a suspected older dural sinus thrombus still requires intra-arterial angiography as the primary diagnostic tool.

Adolescent↗
PubMed2006

Septic thrombosis of the cavernous sinus: two different mechanisms.

PURPOSE: Septic thrombosis of the cavernous sinus is a rare condition that may lead to significant morbidity and mortality if not diagnosed and treated urgently. We present two recent cases of bilateral septic cavernous sinus thrombosis with differing etiologies, the first of dental origin and the second a complication of sphenoid sinusitis. METHODS: Case report. RESULTS: A diagnosis of cavernous sinus thrombosis was made based on clinical findings and confirmed by imaging in both patients. The etiology in the first patient was related to poor dental hygiene, with resultant spread of infection to the cavernous sinuses. The second had bilateral sphenoid sinusitis, with intravascular gas noted in both orbits and cavernous sinuses. This is the first reported occurrence of such an event associated with septic cavernous sinus thrombosis. Bilateral sphenoidotomies with evacuation of the sinuses were performed, and Haemophilus influenzae was cultured from the sphenoidotomy fluid and blood. Broad spectrum intravenous antibiotics were given in both patients, and complete recovery achieved within weeks. CONCLUSION: In septic thrombosis of the cavernous sinus, early recognition and prompt management with broad spectrum intravenous antibiotics is crucial for full recovery. The primary source of sepsis may be a distant focus with septicemia preceding thrombosis of the cavernous sinus. Alternatively, infection may spread from facial regions via the facial venous plexus or from the sphenoid sinus directly to the adjacent cavernous sinus.

Adult↗
PubMed2001

Combined risk factors contributing to cerebral venous thrombosis in a young woman.

Cerebral venous thrombosis is a rare condition affecting predominantly adolescents or young adults. The presentation is often non-specific, and delay in diagnosis is common. The otolaryngologist may be consulted about the radiological findings of lateral sinus thrombosis and mastoid changes. The association of congenital thrombophilia with unusual presentations of venous thrombosis, especially in young individuals is now well documented. We present a case of lateral and sagittal sinus thrombosis complicated by cerebral venous infarction in a girl with protein C deficiency and masked mastoiditis. Unusual forms of venous thrombosis, including cerebral venous thrombosis may develop in association with a single risk factor for thrombosis, but additional risk factors should be sought especially when thrombosis presents in very young individuals. This case draws attention to the multi-causal nature of cerebral venous thrombosis in young adults, and highlights the issue of masked mastoiditis. A coordinated approach by otolaryngological and haematological teams is recommended in such cases.

Adolescent↗
PubMed2007

[Spontaneous closure of dural arteriovenous fistula after performing diagnostic angiography].

The pathogenesis and clinical treatment of dural arteriovenous fistulas (DAVF) has been well established. However, only 15 cases of spontaneous closure of DAVFs have been reported. We describe a case of spontaneous closure of a DAVF. A 60-year-old male presented with pulsatile tinnitus. Selective cerebral angiography revealed a left posterior DAVF fed by the left occipital artery and the middle meningeal artery, which drained into the left transverse sinus and sigmoid sinus. Following the initial angiography, the patient exhibited vomiting with transient disorientation and amnesia. These symptoms, along with the tinnitus, disappeared by the following day. Seven days after the initial angiography, a second angiography was performed that revealed the complete disappearance of the DAVF. Previous reports have described a long period of closure for DAVFs following initial diagnosis. Possible mechanisms for spontaneous closure of DAVFs include the development of scar tissue or a sinus thrombosis that leads to occlusion of the DAVF In this case, the DAVF closure may have been due to a sinus thrombosis induced by sinus stenosis, since occlusion of the draining sinuses coincided with the spontaneous closure of the DAVF. In cases of non-traumatic DAVF without cortical venous reflex that do not present severe symptoms, a prudent course of treatment is necessary since there is a chance of spontaneous closure of the DAVF occuring.

Central Nervous System Vascular Malformations↗
PubMed2001

Intracranial complications of acute and chronic mastoiditis: report of two cases in children.

OBJECTIVE: The clinical picture of mastoiditis, sigmoid sinus thrombosis and brain abscess has changed with the advent of antibiotics. A delay in the recognition of intracranial complications in children and in the institution of appropriate therapy may result in morbidity and mortality. Increased mortality of the children has been correlated with the neurological status of the patient on admission to hospital. METHOD: A retrospective study was made of two children with acute mastoiditis and sigmoid sinus thrombosis and chronic mastoiditis with cerebellar abscess treated in 1997 in the ENT Department of the Medical University of Gdansk. RESULTS: We present two cases of intracranial complications in children (13 and 11 years old) originating from acute and chronic otitis media. The first case, of a 13-year-old boy with sigmoid sinus thrombosis as a complication of acute otitis media took its course as a typical Symonds Syndrome. Mastoidectomy, thrombectomy and jugular vein ligation associated with antibiotics and edema-reducing drugs and anticoagulants proved to be successful. The second case of an 11-year-old boy with exacerbated chronic otitis media with cholesteatoma and mastoiditis, was complicated by suppurative meningitis, cerebellar abscess, perisinual abscess and sigmoid sinus thrombophlebitis. Neurosurgical approach by suboccipital craniotomy and abscess drainage was ineffective. Otological treatments of modified radical mastoidectomy, thrombectomy, jugular vein ligation, perisinual and cerebellar abscess drainage associated with wide-spectrum antibiotics and edema-reducing drugs were performed with a very good outcome. After 3 years of follow-up the patients remain without any neurological and psychiatric consequences. CONCLUSION: The authors show different courses of both presented complications and imaging techniques and surgical procedures performed in these children. The sigmoid sinus trombosis with Symonds Syndrome may be difficult to diagnose due to previous antibiotics valuable in establishing the diagnosis and the extent of disease. The successful therapy is based on understanding of pathogenesis of the intracranial complication and the cooperation of an otolaryngologist, a neurologist, a neurosurgeon and an ophthalmologist.

Acute Disease↗
PubMed2006

Infantile spasms as an adverse outcome of neonatal cortical sinovenous thrombosis.

Cerebral sinovenous thrombosis is a rare but potentially serious condition often occurring in children with nonspecific presenting features. Much remains to be learned about the long-term outcome of infants with cerebral sinovenous thrombosis. We report a series of four patients taken from a prospective database of neonates with sinovenous thrombosis who subsequently developed infantile spasms, three with hypsarrythmia on electroencephalography and one with multiple independent spike foci. The first patient presented at 2 weeks of age with hypernatremia, dehydration, and seizures. He was found to have extensive thrombosis and hemorrhagic infarction of the right basal ganglia. The second patient presented at 5 weeks of life and was found to have sagittal sinus thrombosis with bilateral intracranial hemorrhage. The third patient presented with seizures on day 1 of life and was found to have venous thrombosis involving the torcular, extending into the sagittal sinus. The fourth patient presented at 3 weeks with lethargy and seizures. He was diagnosed with bacterial meningitis and also had extensive sinus thrombosis. All patients developed infantile spasms at ages 9, 7, 11, and 10 months, respectively. This is the first report in the English literature describing infantile spasms as a possible outcome of sinovenous thrombosis in early infancy.

Anticoagulants↗