Splenic infarction is a serious condition, though its severity varies widely depending on the underlying cause and how much of the spleen is affected. In one clinical study, overall mortality was 5 percent, while 36 percent of patients experienced complications, most commonly involving the lungs. That means most people recover, but the condition demands prompt medical attention because it can signal a dangerous underlying disease and, in rare cases, lead to life-threatening complications like abscess or rupture.
What Happens During a Splenic Infarction
A splenic infarction occurs when blood flow to part of the spleen gets blocked, starving the tissue of oxygen. Without blood supply, the affected tissue dies. The blockage can happen in an artery feeding the spleen or in the veins draining it. Most often, a clot or cluster of abnormal cells travels through the bloodstream and lodges in one of the spleen’s blood vessels.
In people with sickle cell disease, the mechanism is slightly different. Episodes of low oxygen or increased acidity cause red blood cells to deform into a rigid, crescent shape. These misshapen cells clump together and physically clog the spleen’s tiny vessels. The result is the same: tissue downstream from the blockage dies.
Common Underlying Causes
Splenic infarction is rarely a standalone problem. It almost always points to something else going on in the body, and the seriousness of the infarction often depends on that underlying condition.
The two major categories are heart-related clot disorders and blood cancers. Atrial fibrillation, an irregular heart rhythm, is the leading cardiac cause, especially in older adults. The irregular heartbeat allows blood to pool in the upper chambers of the heart, forming clots that can break loose and travel to the spleen. Even the intermittent form of atrial fibrillation (called paroxysmal) carries this risk.
On the blood cancer side, conditions like chronic myeloid leukemia create a prothrombotic state, meaning the blood is more prone to clotting. This happens through a combination of elevated and overactivated blood cells, chronic inflammation, and damage to blood vessel walls. When both atrial fibrillation and a blood cancer are present in the same patient, the clotting risk compounds through overlapping but distinct mechanisms. Other causes include infectious diseases and infiltrative conditions that affect the spleen directly.
Symptoms and How It’s Found
The hallmark symptom is pain. In a study tracking patients over 10 years, 80 percent presented with abdominal or left flank pain. Left upper quadrant pain, specifically in the area beneath the lower left ribs where the spleen sits, was the single most common complaint at 33 percent. Tenderness in that area on physical exam was found in about 35 percent of cases. Fever and chills showed up in roughly 27 percent of patients.
Some splenic infarctions, particularly small ones, produce no symptoms at all and are discovered incidentally on imaging done for another reason. This is part of why severity is so variable. A tiny infarct found by accident in an otherwise healthy person is a very different situation from a large infarct in someone with uncontrolled atrial fibrillation or leukemia.
CT scans with contrast are the primary tool for diagnosis. The dead tissue appears as a wedge-shaped area that doesn’t light up with contrast dye, because blood is no longer flowing through it. Imaging also helps rule out complications like abscess formation.
The Complications That Make It Dangerous
Most splenic infarctions heal on their own with supportive care. The two complications that elevate the danger are abscess and rupture.
A splenic abscess forms when the dead tissue becomes infected, creating a walled-off pocket of pus. This is uncommon overall, with reported incidence between 0.14 and 0.7 percent across clinical series, but it is life-threatening when it occurs. If a splenic abscess ruptures, it can spill infected material into the abdominal cavity, causing peritonitis. Fewer than 10 cases of a ruptured splenic abscess causing free air in the abdomen had been reported in the medical literature as of the most recent review, making it exceptionally rare but extremely dangerous.
Splenic rupture without abscess is another possibility, particularly if the infarction is large or the spleen was already enlarged from the underlying disease. This can cause significant internal bleeding and may require emergency surgery.
How It’s Treated
Treatment depends on the size of the infarction, the stability of the patient, and what caused the event in the first place.
For most cases, the approach is conservative. That means managing pain, monitoring for complications with repeat imaging, and treating the underlying cause. If atrial fibrillation triggered the clot, blood thinners become a priority to prevent further embolic events. If a blood cancer is responsible, treatment of that cancer takes center stage.
Surgery to remove the spleen (splenectomy) is reserved for more severe situations: significant bleeding that can’t be controlled, rupture, or abscess that doesn’t respond to drainage and antibiotics. In recent years, less invasive techniques like blocking the bleeding vessel with a catheter-based procedure have been used increasingly in stable patients who have evidence of active vascular injury on their CT scan, sometimes avoiding the need for full spleen removal.
Recovery and Life Without a Spleen
When treated conservatively, small to moderate splenic infarctions typically heal over several weeks as the body reabsorbs the dead tissue. The area may scar, but the remaining healthy spleen tissue continues to function. Follow-up imaging is usually done to confirm healing and watch for delayed complications like abscess formation.
If the infarction is large enough that 50 percent or more of the spleen’s tissue is lost, or if a splenectomy is performed, the implications extend well beyond the initial event. The spleen plays a critical role in fighting infections from encapsulated bacteria, the types responsible for certain pneumonias, meningitis, and bloodstream infections. Without a functioning spleen, you become significantly more vulnerable to these infections, a risk that lasts for life.
Current guidelines from the Advisory Committee on Immunization Practices recommend that anyone who has lost 50 percent or more of their spleen’s mass, whether from surgery or from extensive infarction, should be vaccinated against encapsulated organisms. These vaccinations are an essential, not optional, part of long-term care. The increased infection risk also means that fevers and signs of illness need to be taken more seriously going forward, with a lower threshold for seeking medical evaluation.