Splenic Artery Aneurysm
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Direct answer
The splenic artery is the commonest site of visceral artery aneurysm — roughly 60 percent of the total — characteristically a small, often calcified, asymptomatic lesion in a multiparous woman, discovered as a signet-ring calcification in the left upper quadrant on a plain film or incidentally on CT. Its two dangerous faces are rupture during pregnancy — classically catastrophic, with high maternal and fetal mortality and a recognized triad of preceding episodic pain — and rupture in patients with portal hypertension or after liver transplantation. Intervention is indicated for symptomatic aneurysms, those above 2 centimetres, growth on serial imaging, aneurysms in women of childbearing age contemplating pregnancy, and in transplant candidates; the modern first-line treatment is endovascular coil embolisation or covered-stent exclusion, with surgical ligation or aneurysmectomy reserved for ruptured or unfit-for-endovascular cases.
What you must remember
- Epidemiology rules: commonest visceral artery aneurysm (about 60 percent); female predominance; associations — multiparity (repeated hyperdynamic states and hormonal wall changes), portal hypertension, liver transplantation, pancreatitis and pseudoaneurysms from digestion, medial fibrodysplasia and collagen disease.
- The classic incidental clue: curvilinear signet-ring calcification in the left upper quadrant on plain radiograph — an exam one-liner that points to splenic artery aneurysm among options.
- Rupture risk pattern: higher in pregnancy (reported maternal mortality historically up to 70 percent and fetal loss higher still — quote as "high, historically reported above half"), in portal hypertension and in larger lesions; rupture may follow a "double-rupture" pattern — initial lesser-sac tamponade, then free intraperitoneal haemorrhage after a lucid interval.
- Intervention thresholds: symptomatic any size; diameter above 2 cm; documented enlargement; women planning pregnancy; pseudoaneurysms (thin-walled, pancreatitis-associated) essentially always treated; transplant and cirrhotic patients treated at lower thresholds.
- Treatment ladder: endovascular coil embolisation of the aneurysm with parent artery sacrifice (the usual splenic artery aneurysm tolerates splenic infarction risk because of collaterals) or flow-diverting/covered stent to preserve the artery; open ligation, aneurysmorrhaphy or splenectomy with aneurysm for rupture; antibiotics after embolisation rarely needed.
- Location nuance: distal/hilar aneurysms may require splenectomy — hence vaccination against pneumococcus, meningococcus and Haemophilus influenzae before elective splenectomy; proximal lesions can be ligated safely.
- Distinguish: splenic artery pseudoaneurysm in pancreatitis (pseudo-cyst erosion) ruptures freely into gut, peritoneum or pancreatogenic pathways and needs urgent treatment regardless of size.
A typical exam case
A 34-year-old woman, gravida 3, is evaluated for left flank discomfort; an ultrasound ordered for renal calculus query shows a 2.4-centimetre aneurysm of the mid splenic artery, partly calcified. She is asymptomatic with stable vital signs. Because the aneurysm exceeds 2 centimetres and she is of childbearing age planning more children, treatment is recommended rather than observation. Angiography confirms a saccular mid-splenic-artery lesion, and coil embolisation with deliberate parent-artery sacrifice — "sandwich" coils distal and proximal to the sac — excludes it; the spleen survives on short gastric and gastroepiploic collaterals, with a small infarct on follow-up imaging but normal function. Had she instead presented at 32 weeks of pregnancy with collapse and a tender left upper quadrant, the diagnosis would be ruptured splenic artery aneurysm until proven otherwise — immediate resuscitation, crossmatching, emergency laparotomy with aneurysm ligation and splenectomy, caesarean delivery decided by fetal viability — the scenario every textbook uses to justify treating small aneurysms in young women.
How the exam frames it
Three recurring angles. First, the plain-film stem — a calcified ring in the left upper quadrant asks for the commonest visceral aneurysm, and "splenic artery" beats renal, hepatic and superior mesenteric options. Second, the pregnancy-rupture link — episodic left upper quadrant pain followed by shock in a pregnant multipara is the double-rupture story, and intervention thresholds (2 cm, childbearing intent) are the natural follow-up question. Third, the modern treatment answer — endovascular embolisation first, with splenectomy reserved for distal rupture — plus the pre-splenectomy vaccination detail for the operative option, which is where viva examiners probe whether the candidate understands OPSI risk.
Frequently asked questions
Which is the commonest visceral artery aneurysm?
The splenic artery — about 60 percent of visceral aneurysms, typically in multiparous women and often discovered incidentally as a calcified signet-ring shadow.
When is an asymptomatic splenic artery aneurysm treated?
When it exceeds 2 centimetres, is enlarging on serial imaging, is symptomatic, occurs in a woman who may become pregnant, or arises in a transplant candidate or a patient with portal hypertension.
Why is rupture during pregnancy so feared?
Historical series report maternal mortality above half and fetal mortality higher still, driven by the hyperdynamic pregnant circulation and the tendency to delayed recognition.
What is the first-line treatment?
Endovascular coil embolisation or stent exclusion, which avoids laparotomy; splenectomy with aneurysm ligation is reserved for ruptured, distal-hilar or endovascular-failure cases.
What is the double-rupture phenomenon?
Initial bleeding into the lesser sac that is temporarily tamponaded, followed after a deceptive interval by free intraperitoneal rupture and collapse — a pattern seen with splenic artery aneurysms.