Anterior spinal artery syndrome (ASAS) is a very rare condition which occurs following infarction of the anterior two-third of the spinal cord supplied by the anterior spinal artery. The cause of the infarction can be either iatrogenic or secondary to diseases. Common etiologies include mediastinal surgeries [1] [2], diabetes with atherosclerosis [3], diseases of the aorta [4], hematological disorders (sickle cell, polycythemia), cervical spine injury or spondylosis [5] [6] [7], infections (tuberculosis, N.meningitidis) [8] [9] [10], drugs (cocaine) [11], vasculitis, and idiopathic.

The common clinical presentation of ASAS is sudden onset, severe, pain along the spinal nerve roots radiating to the lower limbs with quadriparesis due to corticospinal tract involvement. The myelopathy can be associated with impaired bladder, bowel and sexual function depending upon the level at which the spinal cord is affected. Pain, as well as, temperature sensation are lost below the level of the infarction as the lateral spinothalamic tract is affected while the posterior column vibration and position sense are preserved. Orthostatic hypotension may be present due to autonomic dysfunction. Occasionally the spinal cord gray matter may be involved, preferentially with the preservation of sensory, bladder and bowel functions.

ASAS should be suspected in any adult or child presenting with acute onset painful quadriparesis with preservation of posterior column sensations. History may indicate the etiology but a thorough physical and neurological examination are vital for diagnosis of the condition as well a to detect the level and extent of the neurological deficits. Routine laboratory tests such as complete blood count with differential, serum blood glucose, erythrocyte sedimentation rate (ESR), antinuclear antibody (ANA) levels, complement assay, nuclear antibody assays, serum lipids, serum electrolytes, and serology for syphilis should be ordered. An infectious etiology is indicated by leukocytosis while inflammatory markers may be elevated in infections as well as vasculitis. Besides diabetes, it is important to exclude coagulation disorders with tests like activated partial thromboplastin time, antiphospholipid antibody titer, protein C and protein S levels and platelet count [12] [13]. Cerebrospinal fluid analysis (CSF) is performed to look for infectious and autoimmune conditions while blood and CSF polymerase chain reaction (PCR) may be required to exclude viral etiologies.

However, the diagnosis of ASAS can only be confirmed with a magnetic resonance (MRI) scan of the spinal cord. This can detect all the causative lesions within or outside the spinal cord [14] [15] [16] [17] [18] [19]. Ideally, it should be performed at the earliest to avoid complications such as renal failure from developing [1]. A concomitant brain MRI may be useful in identifying lesions of multiple sclerosis, sarcoid, and other infections. A computed tomography (CT) scan and plain radiography do not have a significant role in the diagnosis of ASAS. If MRI is not available then CT myelography can help to detect tumors. Spinal angiography (arteriography) may be performed to identify an arteriovenous malformation

Other supportive tests in ASAS include electromyography (EMG) and nerve conduction velocity (NCV) tests to document neurological deficits and denervation changes. They also help to differentiate ASAS from polyneuropathy.

Temporal artery biopsy is indicated only if confirmation of giant cell arteritis as the underlying etiology of ASAS is suspected.

The treatment of Anterior Spinal Artery Syndrome primarily focuses on addressing the underlying cause and managing symptoms. If the syndrome is due to a vascular blockage, medications such as anticoagulants or thrombolytics may be used to restore blood flow. Supportive care, including physical therapy and rehabilitation, is essential to help patients regain as much function as possible. Pain management and bladder or bowel care are also important components of treatment.

The prognosis for individuals with ASAS varies depending on the severity of the initial injury and the timeliness of treatment. Some patients may experience significant recovery, particularly if treatment is initiated promptly. However, others may have persistent deficits, such as weakness or sensory loss. Early rehabilitation and supportive care can improve outcomes and enhance the quality of life for affected individuals.

The most common cause of Anterior Spinal Artery Syndrome is a blockage or narrowing of the anterior spinal artery, often due to atherosclerosis (buildup of fatty deposits in the arteries) or embolism (a blood clot that travels to the artery). Other potential causes include trauma, spinal surgery complications, or conditions that lead to reduced blood flow, such as severe hypotension (low blood pressure).

ASAS is a rare condition, and its exact incidence is not well-documented. It can occur at any age but is more commonly seen in adults. The risk factors for developing ASAS are similar to those for other vascular diseases and include hypertension, diabetes, smoking, and high cholesterol levels.

The pathophysiology of Anterior Spinal Artery Syndrome involves the interruption of blood supply to the anterior two-thirds of the spinal cord. This area is responsible for motor control and pain and temperature sensation. When blood flow is compromised, the affected spinal cord tissue becomes ischemic (lacking oxygen), leading to cell death and the subsequent neurological deficits observed in ASAS.

Preventing ASAS involves managing risk factors associated with vascular disease. This includes maintaining a healthy lifestyle with regular exercise, a balanced diet, and avoiding smoking. Controlling blood pressure, cholesterol, and blood sugar levels can also reduce the risk of vascular complications that may lead to ASAS.

Anterior Spinal Artery Syndrome is a rare but serious condition resulting from impaired blood flow to the spinal cord. It presents with sudden motor and sensory deficits, primarily affecting the lower body. Diagnosis involves clinical evaluation and imaging, while treatment focuses on restoring blood flow and managing symptoms. Prognosis varies, but early intervention and rehabilitation can improve outcomes. Understanding the risk factors and pathophysiology is crucial for prevention and management.

If you or someone you know is experiencing sudden weakness, loss of sensation, or difficulty with bladder or bowel control, it is important to seek medical attention promptly. Anterior Spinal Artery Syndrome is a condition that affects the spinal cord's blood supply, leading to these symptoms. Early diagnosis and treatment can help improve recovery and manage symptoms effectively. Maintaining a healthy lifestyle and managing risk factors can also help prevent this condition.

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