What does the subdural space contain?

The classic view has been that a so-called subdural space is located between the arachnoid and dura and that subdural hematomas or hygromas are the result of blood or cerebrospinal fluid accumulating in this (preexisting) space.

What is subdural effusion?

A subdural effusion is a collection of cerebrospinal fluid (CSF) trapped between the surface of the brain and the outer lining of the brain (the dura matter). If this fluid becomes infected, the condition is called a subdural empyema.

How do you get subdural empyema?

Subdural empyema can develop after a cranial surgery or after a trauma, particularly in cases where there is a compound depressed fracture. Subdural empyema have been reported after secondary infection of a subdural effusion or hematoma.

What causes subdural abscess?

Paranasal sinusitis is the primary cause of a subdural empyema in 50% to 80% of patients, and otitis media is the primary cause in 10% to 20%. Superficial infections of the scalp and skull, craniotomy, or septic thrombophlebitis from sinusitis, otitis, or mastoiditis may extend to the subdural space, causing empyema.

What is the difference between abscess and empyema?

Empyema is defined by purulent fluid collection in the pleural space, which is most commonly caused by pneumonia. A lung abscess, on the other hand, is a parenchymal necrosis with confined cavitation that results from a pulmonary infection.

What causes Cerebritis?

Cerebritis (or myelitis) develops with bacterial and fungal infections and may be secondary to meningitis, penetrating injury, or hematogeneous dissemination from systemic infection. Small collections of acute inflammatory cells indicate the start of a bacterial abscess (Fig.

What is a hygroma in the brain?

Intracranial Hematoma or Hygroma

An intracranial hygroma is the collection of cerebrospinal fluid without blood. Although some head injuries — such as one that causes only a brief lapse of consciousness (concussion) — can be minor, an intracranial hematoma is potentially life-threatening.

What is extradural abscess?

Definition: Circumscribed collections of suppurative material occurring in the spinal or intracranial EPIDURAL SPACE. The majority of epidural abscesses occur in the spinal canal and are associated with OSTEOMYELITIS of a vertebral body; ANALGESIA, EPIDURAL; and other conditions.

Does abscess mean?

: a localized collection of pus surrounded by inflamed tissue.

How is an epidural abscess treated?

The signs and symptoms of epidural abscess are nonspecific and can range from low back pain to sepsis. The treatment of choice in most patients is surgical decompression followed by four to six weeks of antibiotic therapy. Nonsurgical treatment may be appropriate in selected patients.

How do you describe an abscess?

An abscess is a collection of pus in any part of the body. In most cases, the area around an abscess is swollen and inflamed.

What is a spinal epidural abscess?

An epidural abscess is an infection that forms in the space between your skull bones and your brain lining (intracranial epidural abscess). Quite often, it forms in the space between the bones of your spine and the lining membrane of your spinal cord (spinal epidural abscess).

What is Ludwig angina?

Ludwig angina is an infection of the floor of the mouth under the tongue. It is due to a bacterial infection of the teeth or jaw.

What is subperiosteal abscess?

Subperiosteal abscess is a condition that typically presents as collection of pus in the space between the periorbital and the lamina papyracea as a result of the migration and spread of an infection, such as sinusitis and ethmoiditis.

What causes subdural hygroma?

Subdural hygromas most commonly occur when events such as head trauma, infections, or cranial surgeries happen in tandem with brain atrophy, severe dehydration, prolonged spinal drainage, or any other event that causes a decrease in intracranial pressure.

What is subdural hydrocephalus?

Subdural effusion with hydrocephalus (SDEH) is a rare complication of traumatic brain injury, especially following decompressive craniectomy (DC) for posttraumatic cerebral infarction. The diagnosis and treatment are still difficult and controversial for neurosurgeons.

What causes meningoencephalitis?

Meningoencephalitis can be caused by bacteria, viruses, fungi, and protozoan or as secondary sequel of other inflammations like AIDS. The viral or aseptic meningoencephalitis is mainly caused by enteroviruses, varicella‐zoster viruses, herpes simplex viruses, or measles viruses.

Is the subdural space real?

The subdural space does not exist under normal circumstances and is appreciable only when there is underlying pathology ². Bridging veins drain from the underlying brain to the dura mater and the superior sagittal sinus.

Where does the subdural space end?

It communicates with the intracranial subarachnoid space via the foramen magnum and ends at the level of the S2 vertebra. It is a relatively large space, containing approximately half of the total volume of cerebrospinal fluid (75mLs out of 150mLs) ¹.