Clinical Presentation of Septic Embolic Splenic Infarction
A patient with septic embolic splenic infarction typically presents with left upper quadrant abdominal pain, fever, and signs of systemic sepsis, though notably, splenic infarction is often asymptomatic and discovered incidentally on imaging. 1
Key Clinical Features
Symptomatic Presentation (Present in ~69% of cases)
Pain characteristics:
- Left upper quadrant abdominal pain (most common)
- Pain radiating to the left flank or back
- Abdominal tenderness on examination 1
Systemic signs suggesting septic embolism:
- Persistent or recurrent fever (especially common in embolic conditions - present in 70% of cases) 1, 2
- Persistent or recurrent bacteremia despite appropriate antibiotics 1
- Signs of ongoing sepsis (tachycardia, hypotension, altered mental status) 1
- Constitutional symptoms (malaise, weight loss, decreased appetite) 2, 3
Important Clinical Context
Underlying conditions to identify:
- Infective endocarditis (40% of left-sided IE cases develop splenic infarction) 1
- Atrial fibrillation or other cardiac sources of emboli 4
- Recent cardiac valve surgery or instrumentation 5
- History suggesting endocarditis: new heart murmur, known valvular disease, IV drug use 1
Asymptomatic Presentation (31% of cases)
Critical pitfall: Splenic infarction delineated by imaging is frequently asymptomatic, particularly in patients with non-malignant hematologic conditions (55% asymptomatic) 1, 2. Clinical splenomegaly, present in up to 30% of IE cases, is not a reliable sign of splenic infarction or abscess 1.
Distinguishing Bland Infarction from Septic Abscess
This distinction is crucial for management and can be challenging:
Features suggesting progression to splenic abscess (occurs in only 5% of splenic infarctions):
- Persistent fever despite appropriate antibiotics 1
- Recurrent positive blood cultures 1
- Ongoing sepsis that doesn't improve with antimicrobial therapy 1
- Persistence or enlargement of splenic defects on serial CT/MRI 1
Bland infarcts typically:
- Show clinical and radiographic improvement during appropriate antibiotic therapy 1
- May be completely asymptomatic 1
Laboratory Findings
While not specific, expect:
- Leukocytosis with neutrophilia 4, 6
- Elevated inflammatory markers (CRP, ESR)
- Elevated LDH (markedly increased) 4, 6
- Positive blood cultures (viridans streptococci and S. aureus each account for 40% of cases; enterococci 15%) 1
- Possible anemia and thrombocytopenia 4
Rare but Life-Threatening Complication
Splenic rupture with hemorrhage is a rare but catastrophic complication that presents with acute abdominal pain, hemodynamic instability, and signs of intraperitoneal bleeding 1. This requires immediate surgical intervention.
Diagnostic Approach
CT abdomen/pelvis with IV contrast is the diagnostic modality of choice (sensitivity and specificity 90-95%) 1, 7, 1. On CT, infarcts appear as peripheral, low-density, wedge-shaped areas, while abscesses show contrast-enhancing cystic lesions 1. MRI has equivalent diagnostic accuracy 1.
The key to diagnosis is maintaining high clinical suspicion in any patient with known thromboembolic disease, endocarditis, or hematologic disorders who develops left upper quadrant pain with localized or systemic inflammatory signs 8, 2.