Space occupying lesion

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Aditya Govindavarjhulla, M.B.B.S. [2]

Overview

Intracranial space occupying lesions are tumors or abscesses present within the cranium or skull. These lesions put pressure on the adjacent brain tissue causing its damage.

Pathophysiology

• Tumors of brain may develop focally or can be of metastatic origin. They grow in size causing focal tissue damage by pressure and infiltration.

• Bleeding into the brain tissue causes formation of hematoma. If these hematoma's get infected they may turn into abscess.

• With increasing volume in the brain pressure increases too leading to signs of increased intra cranial pressure.

Causes

• Primary brain tumors
• Metastatic lesion
• Hematoma
• Cerebral abscess
• Lymphomas
• Granuloma
• Tuberculoma
• Cysticercosis

Differentiating Space occupying lesions from other diseases

Pituitary apoplexy should be differentiated from other diseases causing severe headache for example:

Disease	Symptoms	Diagnosis
		CT/MRI	Other Investigation Findings
Subarachnoid hemorrhage	Severe headache (as a worst headache of the life) Headache is the main symptom (often starts suddenly and starts after a popping or snapping feeling in the head) Double vision Nausea and vomiting Symptoms of meningeal irritation Sudden decreased level of consciousness Rapid progression of symptoms	The modality of choice for diagnosis of subarachnoid hemorrhage is noncontrast head computed tomography (CT), with or without lumbar puncture.[1] CT shows hyperattenuating material filling the subarachnoid space.	Lumbar puncture (LP) is necessary when there is a strong suspicion of subarachnoid hemorrhage. LP will show: Elevated opening pressure Elevated red blood cell (RBC) Xanthochromia
Meningitis	Headache   Neck stiffness Fever Photophobia (inability to tolerate bright light) Phonophobia (inability to tolerate loud noises)  Irritability, altered mental status (in small children)	CT scan of the head may be performed before LP to determine the risk of herniation.	Diagnosis is based on clinical presentation in combination with CSF analysis. CSF analysis is the investigation of choice. For more information on CSF analysis in meningitis please click here.
Intracranial mass	Headache Nausea Vomiting Change in mental status Seizures Focal symptoms of brain damage Associated co-morbid conditions like tuberculosis, etc	CT or MRI is the initial test to detect intracranial lesions. These imaging tests determine the location of intracranial mass lesion(s) and help in guiding therapy.	Biopsy of the lesion is needed to identify the nature of the lesion such as: Tumor Abscess X- ray of the skull is a non specific test, but useful if any of the lesions are calcified.
Cerebral hemorrhage	Headache, vomiting, and depressed level of consciousness from increased intracranial pressure (ICP)   Progression of focal neurological deficits over periods of hours	CT scan without contrast is the initial test performed to diagnose ischemic stroke and rule out hemorrhagic stroke. CT is very sensitive for identifying acute hemorrhage which appears as hyperattenuating clot. Gradient echo and T2 susceptibility-weighted MRI are as sensitive as CT for detection of acute hemorrhage and are more sensitive for identification of prior hemorrhage.	PT/ INR and aPTT should be checked to rule out coagulopathy.
Cerebral Infarction	The symptoms of an ischemic stroke vary widely depending on the site and blood supply of the area involved. For more information on symptoms of ischemic stroke based on area involved please click here.	CT scan without contrast is the initial test performed to diagnose ischemic stroke and rule out hemorrhagic stroke. CT may show hypo-attenuation and swelling of involved area. MR diffusion weighted imaging is the most sensitive and specific test for diagnosing ischemic stroke and may help detect presence of infarction in few minutes of onset of symptoms.	Carotid doppler may be done to check for patency of carotid arteries and blood supply to the brain. Cerebral angiogram is an invasive test and detect abnormalities of the blood vessels, including narrowing, blockage, or malformations (such as aneurysms or arterio-venous malformations).
Intracranial venous thrombosis	Headache: It is a common presentation (present in 90% of cases); it tends to worsen over a period of several days, but may also develop suddenly (thunderclap headache).[1] The headache may be the only symptom of cerebral venous sinus thrombosis.[2] Inability to move one or more limbs. Weakness on one side of the face. Seizures: 40% of all patients have seizure. Depressed level of consciousness and otherwise unexplained changes in mental status are common symptoms in the elderly.[4]	The classic finding of sinus thrombosis on unenhanced CT images is a hyperattenuating thrombus in the occluded sinus. CT and MRI may identify Cerebral edema and venous infarction may be apparent.	CT venography detects the thrombus, computed tomography with radiocontrast in the venous phase (CT venography or CTV) has a detection rate that in some regards exceeds that of MRI. Cerebral angiography may demonstrate smaller clots, and obstructed veins may give the "corkscrew appearance".
Migraine	Severe or moderate headache (which is often one-sided and pulsating) lasts between several hours to three days. Other symptoms include gastrointestinal upsets, such as nausea and vomiting, and a heightened sensitivity to bright lights (photophobia) and noise (phonophobia). Approximately one third of people who experience migraine get a preceding aura.[4]	CT and MRI may be needed to rule out other suspected possible causes of headache.	Migraine is a clinical diagnosis that does not require any laboratory tests. Laboratory tests can be ordered to rule out any suspected coexistent metabolic problems or to determine the baseline status of the patient before initiation of migraine therapy.
Head injury	Headache Confusion Drowsiness Personality change Seizures Nausea and vomiting Loss of consciousness lucid interval	CT scan is the first test performed and identifies cerebral hemorrhage (appears as hyperattenuating clot) following head injury. CT scan is also less time consuming. MRI is more sensitive, takes more time and is done in patients with symptoms unexplained by CT scan.	The Glasgow Coma Scale is a tool for measuring degree of unconsciousness and is thus a useful tool for determining severity of injury. The Pediatric Glasgow Coma Scale is used in young children.
Lymphocytic hypophysitis	Lymphocytic hypophysitis is most often seen in late pregnancy or the postpartum period with the following symptoms: Hypopituitarism Mass lesion effect such as headache or visual field defects	CT & MRI typically reveal features of a pituitary mass.	The most accurate test is pituitary biopsy which will show lymphocytic infiltration.
Radiation injury	Headache Impairment of mental function is the most prominent feature such as personality change, impairment of memory, confusion, learning difficulties. Focal neurological abnormalities and evidence of raised intracranial pressure.	CT & MRI will show: Focal radiation necrosis Diffuse white matter injury Contrast-enhancing mass surrounded by edema and mass effect	PET scan Radiation necrosis is hypo metabolic and will have decreased uptake of fluorodeoxyglucose.

Risk factors

• Trauma
• HIV infection
• Diabetes
• Malignancy
• COPD (Chronic obstructive pulmonary disease)
• Tuberculosis

History and symptoms

• Headache
• Nausea
• Vomiting
• Change in mental status
• Seizures
• Focal symptoms of brain damage
• Associated co-morbid conditions like tuberculosis, etc

Diagnosis

Blood tests

• Total blood count, hemoglobin levels for general condition of the person.
• Electrolyte levels
• Serum BNP(Brain natriuretic peptide)

Biopsy

• Biopsy of the lesion is needed to know the nature of the lesion.

X ray

• X- ray skull is quite a non specific test, but useful if any of the lesions are calcified.

• X- ray chest may be warranted if any metastatic tumor is suspected.

CT and MRI

• These tests are of higher value to detect intracranial lesions.
• They have higher sensitivity and specificity compared to X-rays.

Treatment

Treatment depends on the type of the lesion and associated co morbid conditions.

Medical therapy

• Pain killers to relieve the person from headache.
• Steroids to reduce cerebral edema.
• Mannitol to reduce intra cranial pressure.
• Anticonvulsant medication to cover seizures.
• Infections will need antibiotics which can cross blood brain barrier.
• Tumors will treated with chemotherapy.

Surgery

• Primary brain tumors can be surgical excised if they are amendable to surgery.
• Brain radiation is useful in radio sensitive tumors.
• Hematomas are surgically evacuated.