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A blood clot occurring on the wall of a blood vessel where the endothelium is damaged.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a clot of blood formed during the lumen of a blood vessel or in the heart. In a broader sense, extravascular clots of blood that form during bleeding, as well as clots of lymph in the lymphatics are also called thrombi.

The formation of a thrombus consists of the following stages: agglutination of platelets, coagulation of fibrinogen, agglutination of red blood cells, and precipitation of plasma proteins. Thrombi may be white, red, laminated, or hyaline. A white thrombus consists of platelets, fibrin, and white blood cells and is formed slowly during rapid blood flow, generally in arteries. A red thrombus, in which red blood cells predominate, forms rapidly during slow blood flow, generally in veins. The most common type of thrombus is the laminated thrombus, which has a layered structure and crimped surface and contains fragments of white and red thrombi. It is attached to the endothelium of a blood vessel, generally that of a vein; this differentiates it from a postmortem thrombus. A hyaline thrombus forms in blood vessels of the capillary bed and consists of a homogenized mass of protein.

A thrombus may be parietal or obstructive. A parietal thrombus forms within the heart in endocarditis and heart disease, in large arteries in atherosclerosis, and in veins in thrombophlebitis. As a parietal thrombus grows, it becomes obstructive, generally in small arteries and veins. A thrombus that grows rapidly into the lumen of a vessel is called progressive, and one that originates in cardiac insufficiency is called congestive. A thrombus that forms in aneurysms is called dilatational; one that is unattached within an atrium is called spherical. A thrombus can dissolve or can grow connective tissue, a process called organization. Thin-walled blood vessels may appear in this tissue (canalization), or calcium salts may be deposited (calcification). A thrombus may cause an embolism or may become purulent, a condition accompanied by a thrombobacterial embolism and leading to sepsis.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The medical records of 11 patients aged between 2 and 17 years (median age: 14 years) who were diagnosed with cerebral thrombosis between December the 1st, 2010 and December 31st, 2014 in Marmara University, Pendik Training and Research Hospital were retrospectively examined in terms of age, gender, clinical findings, etiology, risk factors predisposing to thrombosis, imaging findings, treatment and prognosis.
A diagnosis of cerebral thrombosis was made with brain magnetic resonance imaging (MRI) and brain magnetic resonance venography (MRV).
A patient aged 14 years who presented because of repeated thrombosis was followed up two years ago in another center because of cerebral thrombosis and received anticoagulant treatment for six months.
In the literature, cerebral thrombosis has been usually manifested with seizure and focal signs in infants and young children, whereas headache has been reported with a higher rate and altered consciousness and seizures have been reported more rarely in older children (15).
Stroke related to cerebral thrombosis accounts for -- % of all strokes.
Chan, "Cerebral thrombosis in [beta]-thalassemia/hemoglobin E disease," Stroke, vol.
Karimi, "Cerebral thrombosis in patients with [beta]-thalassemia: a systematic review," Blood Coagulation and Fibrinolysis, vol.
It was high in cerebral haemorrhage (51.6%) followed by subarachnoid haemorrhage (22.34) and cerebral embolism (20%); 3.7% of patients with cerebral thrombosis expired.
Among these 53 patients (53%) were Cerebral Thrombosis type, 31 patients (31%) were cerebral haemorrhagic type, 6 patients (6%) were of subarachnoid type and 10 patients (10%) cerebral embolism type.
of Patients % of Patients Expired Cerebral thrombosis 53 2 3.7 Cerebral haemorrhage 31 16 51.6 Subarachnoid haemorrhage 6 2 33.34 Cerebral embolism 10 2 20 Total 100 22 22 Table IV: Showing Relation of Level of Consciousness to Immediate Mortality Level of Consciousness Total No.
The acute cerebral thrombosis was diagnosed and after getting the couple, we arranged emergency thrombolytic therapy and then transfer to Intensive Care Unit for continuous therapy, including supportive and anticoagulation treatments.
As far as we know, prior to this, there is no relevant report of ovarian induction treatment resulted in OHSS, complicated with acute cerebral thrombosis event.