Infratentorial Tumors and the Dural Venous Sinuses

A paramedian or midline suboccipital approach for craniotomies and craniectomies is commonly employed for decompression or tumour resections from posterior cranial fossa. The reference for midline is taken as the line joining the nasion and inion on the surface of the skull which is the estimated position of superior sagittal sinus. In the interior, the internal occipital protuberance is the site of confluence of sinuses which presents a spectrum of variations. An unusual pattern of drainage of dural venous sinuses was observed at the site of customary confluence during routine dissection of head region for undergraduate medical students in a sixty-year-old female cadaver. The superior sagittal sinus continued as right transverse sinus as usual but it was connected to the left transverse sinus through a venous channel. There was no appreciable confluence of sinuses at this site. A prominent and atypical cerebellar process emerged from right hemisphere of cerebellum and projected between right transverse sinus and the venous channel connecting right and left transverse sinuses. In the posterior cranial fossa, the internal occipital crest was present on the left of midline separated from internal occipital protuberance. Another small ridge was present to the right of midline. A triangular fossa thus formed on the right side of internal occipital crest was occupied by the unusual prominent process emerging from the right hemisphere of cerebellum.Pre-operative assessment of dural venous sinuses is imperative before any surgical intervention especially around the confluence of the sinuses.

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Superior sagittal sinus thrombosis in childhood – a case report

Archives of Public Health ◽

10.3889/aph.2021.5722 ◽

2021 ◽

Vol 13 (1) ◽

pp. 1-5

Author(s):

Aleksandra Gavrilovska-Dimovska ◽

Andreja Gavrilovski ◽

Venko Filipce

Keyword(s):

Superior Sagittal Sinus ◽

Sinus Thrombosis ◽

Cerebral Vein ◽

Cerebral Veins ◽

Venous Sinuses ◽

Sagittal Sinus ◽

Sagittal Sinus Thrombosis ◽

Superior Sagittal Sinus Thrombosis ◽

Dural Venous Sinuses

Cerebral venous sinus thrombosis (CVST) is presence of a blood clot in the dural venous sinuses. This is a rare, but dangerous condition. CSVT is characterized by a highly variable clinical spectrum, difficult diagnosis, variable etiologies and prognosis. The International Study on Cerebral Vein and Dural Sinus Thrombosis (ISCVT) determined the frequency of the sites of SCVT. The aim of this case study was to show the clinical presentation, the examination we made, the therapy that was ordinated and the outcome of the treatment. Case study: A 14-year-old male teenager was admitted to the University Clinic for Neurosurgery in Skopje with GCS 10, accompanied with tonic-clonic epileptic seizures. CT examinations by systems were made, and during the time of recording the patient was given Dormicum 2mg overall dose. CT scan of the brain showed hyperdense zones formation around superior sagittal sinus (SSS), the rest of the medical finding was normal. We ran laboratorytests and the test for hemostasisshowed deviation from the normal range. With the ordinated therapy the clinical condition of the patient drastically improved. He was discharged home 12 days after the admission. He was given a recommendation for further check-ups by a transfusiologist and regular visits to our clinic. Occlusion of the cerebral veins and dural venous sinuses may occur on the basis of local trauma, neoplasm or infection. Primary aseptic thrombosis may involve either cerebral veins or dural venous sinuses, or both in combination. The clinical picture and the prognosis of intracranial venous thrombosis probably depend largely on the location, extent, and rapidity of development of the venous occlusion. Conclusion: Superior sagittal sinus thrombosis is a condition that can be manifested with diverse and many symptoms and signs, which often can start unexpectedly and can be life-threatening.

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