How they develop
Splenic cysts are fluid-filled cavities. They may be congenital or true cysts, post-traumatic pseudocysts after an old hematoma, or parasitic cysts due to echinococcosis. Many are found incidentally on ultrasound or CT.
Symptoms and diagnosis
Small cysts usually cause no symptoms. Larger cysts can cause pain or heaviness in the left upper abdomen, early satiety, nausea, or a sensation of pressure. Rare complications include bleeding, infection, and rupture. Ultrasound, CT, and MRI help define the size, wall, and any septa or solid components. When there is epidemiological suspicion, targeted testing for echinococcosis is performed before any invasive procedure.
Treatment
Simple, small, asymptomatic cysts are usually observed. Surgical management is considered for large, symptomatic, enlarging, or complicated cysts, and when the diagnosis is not secure. Options include cyst excision, partial splenectomy, or total splenectomy. In echinococcosis, planning is specialized and may include antiparasitic medication and surgery.
Frequently asked questions
Is every cyst dangerous?
No. Most are benign and are monitored. Their significance is determined by the imaging appearance, size, and symptoms.
Does the spleen always need to be removed?
No. When technically safe, preservation of functioning splenic tissue is pursued.
Can the cyst simply be drained?
In selected cases, drainage may have a role, but it is not suitable for all cysts and recurrence may occur.
When to seek medical attention
Most splenic cysts are found by chance and cause no harm. Seek urgent assessment for sudden severe pain in the upper left abdomen, fever together with pain (which can mean an infected cyst), pain at the tip of the left shoulder, or faintness, which can signal bleeding or rupture. If a hydatid cyst is known or suspected, hives, wheeze, swelling of the face or breathlessness after a fall or blow to the abdomen need emergency care, because a ruptured cyst can trigger a severe allergic reaction.
What the assessment involves
Ultrasound is usually the first test. CT or MRI then shows the size of the cyst, the thickness of its wall, any internal walls (septa) or solid areas, and its relation to nearby organs. These features help separate simple cysts from cysts that contain tumor tissue and from hydatid cysts.
Your surgeon will ask about travel, contact with dogs, and livestock farming. When a hydatid cyst is possible, a blood test for Echinococcus antibodies is done, and the cyst is not punctured or drained outside a specialist plan, because leakage can spread the parasite and cause an allergic reaction.
Follow-up and recovery
Small simple cysts without symptoms are watched with ultrasound at intervals agreed with the surgeon, for example after six to twelve months and then less often if stable. After surgery, recovery depends on the operation: cyst excision or partial removal of the spleen allows a quicker return to normal life, with the spleen kept where possible. If the whole spleen is removed, the vaccination and fever advice in the splenectomy article applies. After treatment for hydatid disease, imaging and blood tests continue for several years, because the disease can return.
More questions about splenic cysts
Can a cyst be cancerous?
Simple cysts almost never are. Imaging looks for solid areas or thick walls, which would need further assessment.
What is a hydatid cyst, and can it spread?
It is a cyst caused by a tapeworm parasite. It can spread if it leaks or ruptures, which is why treatment is planned carefully, often with anti-parasitic medicine before and after surgery.
