Where is the sigmoid sinus located?
The sigmoid sinus is a large blood vessel that is part of the main venous blood flow that leaves the brain and drains into the jugular vein. The sinus exists on both sides. The sinus is covered normally in bone through the temporal bone near the middle and inner ear.
What are the mastoid sinuses?
In fact, the mastoid is essentially the sinus of the ear. Sound resonates in the air-filled spaces of the ear including the mastoid. The spaces are lined with mucosa like the lining of your mouth, lungs, or stomach.
Is sigmoid sinus and lateral sinus same?
The transverse sinuses are formed by the tentorium cerebelli and drain into the right and left sigmoid sinuses. The transverse sinuses (left and right lateral sinuses), within the human head, are two areas beneath the brain which allow blood to drain from the back of the head.
What forms sigmoid sinuses?
The sigmoid sinus (plural: sigmoid sinuses) is a paired structure and one of the dural venous sinuses. It is the continuation of the transverse sinus (which is similarly variable in size) and becomes the sigmoid sinus as the tentorium cerebelli ends. It is here that the sinus receives the superior petrosal sinus.
What is the sigmoid sinus a continuation of?
The sigmoid sinus is a paired intracranial vessel. It begins as a continuation of the transverse sinus around the opening on the tentorium cerebelli. From here, it descends downward, forming an S-shaped curve in a groove on the mastoid process of temporal bone.
What is sigmoid sinus diverticulum?
Sigmoid sinus diverticulum is a rare vascular finding due to an opening in the bone at the area of the sigmoid sinus creating a pouch, or diverticulum. Sometimes, there may be associated stenosis. The diverticulum may present as pulsatile tinnitus.
How do you get rid of mastoid sinuses?
If the symptoms don’t quickly improve on IV antibiotics, or complications, like an abscess or bone erosion are present, surgery to remove the infected mastoid bone may be recommended. This is called a mastoidectomy. Chronic mastoiditis is treated with oral antibiotics, eardrops, and regular ear cleanings by a doctor.
Can mastoiditis be cancerous?
Malignant tumours of the mastoid are rare, the majority being squamous cell carcinomas. We report two cases whose clinical presentation mimicked mastoid abscess with intracranial complications.
What is meant by sigmoid sinus?
Medical Definition of sigmoid sinus : a sinus on each side of the brain that is a continuation of the transverse sinus on the same side, follows an S-shaped course to the jugular foramen, and empties into the internal jugular vein.
Is the sigmoid sinus intracranial?
Structure. The sigmoid sinus is a dural venous sinus situated within the dura mater.
What is the function of sigmoid sinus?
The sigmoid sinus is actually a pair of two sinuses (right and left) that enable veins to spread from the middle of the head downwards. This dual structure is considered an extension of the transverse sinus, which lies in the hind portion of the brain.
What is sigmoid sinus thrombosis?
Lateral sinus thrombosis, also known as sigmoid sinus thrombosis, forms when infection from the adjacent mastoid contacts and penetrates the venous wall and forms a thrombus. Embolization of the thrombus can cause distal disease.
Where does the sigmoid sinus begin and end?
The sigmoid sinus commences as the termination of the transverse sinus, deeply grooving the inner surface of the mastoid part of the petrous bone, as well as the temporal and occipital bones.
How is the sigmoid sinus different in males and females?
The sigmoid sinus has anastomoses with the mastoid emissary and condylar emissary veins routinely. According to Dai et al., 1 the sigmoid sinus in males is situated more posterior and lateral compared with that in females. This probably is attributable to the difference in cranial size base between the sexes.
What kind of surgery is used for sigmoid sinus?
Surgical treatment consists of sigmoid sinus wall reconstruction/resurfacing, using soft tissue graft, hydroxylapatite cement, and/or autologous bone pâté 5. 1. Dong C, Zhao PF, Yang JG, Liu ZH, Wang ZC.
Where does the sigmoid sinus drain into the jugular bulb?
It drains into the jugular bulb via which it connects with the internal jugular vein . Throughout its course, the sigmoid sinus receives tributaries that connect it to the pericranial veins. These tributaries include the mastoid and (posterior) condylar emissary veins.