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Splenomegaly is an enlargement of the spleen. The spleen usually lies in the left upper quadrant (LUQ) of the human abdomen. Splenomegaly is one of the four cardinal signs of hypersplenism which include; some reduction in the number of circulating blood cells affecting granulocytes, erythrocytes or platelets in any combination, a compensatory proliferative response in the bone marrow, and the potential for correction of these abnormalities by splenectomy. Splenomegaly is usually associated with increased workload (such as in hemolytic anemias), which suggests that it is a response to hyperfunction. It is therefore not surprising that splenomegaly is associated with any disease process that involves abnormal red blood cells being destroyed in the spleen. Other common causes include congestion due to portal hypertension and infiltration by leukemias and lymphomas. Thus, the finding of an enlarged spleen, along with caput medusa, is an important sign of portal hypertension. Symptoms may include abdominal pain, chest pain, chest pain similar to pleuritic pain when stomach, bladder or bowels are full, back pain, early satiety due to splenic encroachment, or the symptoms of anemia due to accompanying cytopenia. Signs of splenomegaly may include a palpable left upper quadrant abdominal mass or splenic rub. It can be detected on physical examination by using Castell's sign or Traube's space, but an ultrasound can be used to confirm diagnosis. In patients where the likelihood of splenomegaly is high, the physical exam is not sufficiently sensitive to detect it; abdominal imaging is indicated in such patients. Symptoms include an enlargement in the size of the spleen, or a change from the spleen's original position to another location, usually in either other parts of the abdomen or into the pelvis. This ability to move to other locations is commonly attributed to the spleen's pedicle being abnormally long.
Physical factors may cause ischuria, constipation, as well as numerous spleen-related diseases such as hypersplenism, thrombocytopenia, and lymphoma. Blocking of the arteries and torsion in the spleen can also result in abdominal pain or swelling. However, lack of visible symptoms — except in incidents of abdominal pain makes the disease difficult for doctors to diagnose, though medical imaging techniques such as medical ultrasonography, magnetic resonance imaging, or computed tomography can be used to confirm its occurrence. A 1-cm to 2-cm splenic tip is palpable in 30% of full-term neonates and in as many as 10% of healthy children. Approximately 3% of healthy college freshmen have palpable spleens. Initial and follow-up studies confirm that these college freshmen are not at high risk for subsequent serious disease. Malaria, schistosomiasis, and other infections in endemic areas are frequent causes of splenomegaly. In malaria-endemic areas, the prevalence of splenomegaly (ie, spleen rate) is a measure of malaria exposure. In hyperendemic areas (eg, Papua New Guinea), the spleen rate in children exceeds 50%. Such hyperendemic areas have a prevalence of massive splenomegaly (hyperreactive malarial splenomegaly) of 1-2% in children.
The Mortality/Morbidity rate is due to splenic rupture which occur in acute splenomegaly associated with infectious mononucleosis. The incidence is 1:1000, and it usually occurs in the first 3 weeks of illness. Splenectomy is uncommonly performed in children with splenomegaly. Nevertheless, should it be clinically indicated, the overall risk of postsplenectomy sepsis is approximately 2%, with increased incidence and mortality in young children. Hypersplenism is the occurrence of thrombocytopenia, and occasionally leukopenia and anemia, in the context of significant splenomegaly. The cytopenias are usually mild but may contribute to overall morbidity. If the splenomegaly underlies hypersplenism, a splenectomy is indicated and will correct the hypersplenism. However, the underlying cause of the hypersplenism will most likely remain; consequently, a thorough diagnostic workup is still indicated, as, leukemia, lymphoma and other serious disorders can cause hypersplenism and splenomegaly. After splenectomy, however, patients have an increased risk for infectious diseases. Patients undergoing splenectomy should be vaccinated against Haemophilus influenzae, Streptococcus pneumoniae, and Meningococcus. They should also receive annual influenza vaccinations. Long-term prophylactic antibiotics may be given in certain cases. In cases of infectious mononucleosis splenomegaly is a common symptom and health care providers may consider using abdominal ultrasonography to get insight into a person's condition. However, because spleen size varies greatly, ultrasonography is not a valid technique for assessing spleen enlargement and should not be used in typical circumstances or to make routine decisions about fitness for playing sports. The usual treatment is splenopexy, fixation of the spleen, but if there is no blood flow after unwinding the spleen through detorsion then splenectomy must be performed. Although there have been few reported cases of treatment through laparoscopic surgery due to the rarity of the disease, it has been proven to be an effective surgical technique.