How should a 53-year-old woman presenting with left upper quadrant pain be evaluated and managed?

Evaluation and Management of Left Upper Quadrant Pain in a 53-Year-Old Woman

CT abdomen and pelvis with IV contrast is the preferred initial imaging study for evaluating acute left upper quadrant pain in this patient. 1

Initial Clinical Assessment

Before ordering imaging, rapidly assess for:

• Hemodynamic stability (hypotension, tachycardia suggesting rupture, bleeding, or sepsis)
• Fever (suggests infectious process requiring urgent source control)
• Known splenomegaly or hematologic disorders (increases risk of splenic complications)
• Recent trauma (even minor trauma with underlying splenomegaly can cause rupture)
• Complex surgical history (may alter imaging approach)

Imaging Strategy

First-Line: CT Abdomen/Pelvis with IV Contrast

This is the workhorse modality that should be ordered in most cases of nonspecific LUQ pain 1. The evidence strongly supports this approach:

• Moderate sensitivity (69%) and excellent specificity (100%) for detecting acute abdominal abnormalities causing LUQ pain 2
• Changes diagnosis in 51% of abdominal pain cases and alters admission decisions in 25% of patients 1
• Rapid acquisition with large field of view covering the broad differential
• IV contrast is essential because inflammatory processes (pancreatitis, gastroenteritis, colitis), infectious etiologies (pyelonephritis, abscess), vascular complications (thrombosis, pseudoaneurysm), and neoplasms can be missed without contrast 1

Oral contrast considerations:

• Not routinely required for most cases 1
• Use positive oral contrast only if suspecting leak, fistula, or postoperative complications
• Neutral contrast (water) is preferred when evaluating gastric or bowel lumen without causing artifacts 1

Alternative Modalities (Select Situations Only)

MRI abdomen with and without IV contrast may be appropriate as initial imaging if:

• Patient is pregnant (MRI achieves 96% sensitivity, 93% specificity for acute abdominal pathology) 1
• Pediatric patient requiring radiation avoidance
• Known contrast allergy precluding CT with IV contrast

Ultrasound abdomen has limited utility as initial imaging:

• Only 18% sensitivity for splenic infarcts compared to CT 1
• May be used for screening splenomegaly or monitoring known conditions serially
• Should not delay definitive cross-sectional imaging 1
• Not recommended as complementary to CT (order one or the other) 1

Avoid these modalities:

• Plain radiography: Only 4% contribution to clinical management in emergency abdominal pain, leads to delays 1
• CT without IV contrast: Misses inflammatory, infectious, vascular, and neoplastic processes 1
• CT with and without contrast: Adds no diagnostic yield except in complex surgical history with prior in-house imaging 1

Differential Diagnosis Framework

The LUQ contains multiple organs, creating a broad differential:

Splenic causes (unique to LUQ):

• Infarction, rupture, abscess, hematoma
• Splenic vein thrombosis
• Splenic artery pseudoaneurysm

Gastric/pancreatic causes:

• Peptic ulcer disease, gastric outlet obstruction
• Pancreatitis and complications

Colonic causes:

• Diverticulitis, ischemic colitis, splenic flexure pathology

Renal causes:

• Pyelonephritis, urolithiasis

Other:

• Adrenal hemorrhage, hernias, referred pain from pneumonia/pericarditis

Special Considerations

If fever is present: CT with IV contrast remains first-line, as this raises concern for abscess requiring urgent source control 1

If splenomegaly is suspected: CT with IV contrast is still preferred over ultrasound for detecting complications (infarction, rupture, thrombosis) 1

In women of childbearing age: Always obtain pregnancy test, as atypical presentations of ectopic pregnancy can present as LUQ pain 3

Common Pitfalls

• Do not order plain radiographs - they delay definitive diagnosis without adding value 1
• Do not skip IV contrast unless absolute contraindication - most pathology requires contrast for detection 1
• Do not use ultrasound as initial study in acute nonspecific LUQ pain - its low sensitivity will necessitate subsequent CT anyway 1
• Consider anatomic variants - elongated retrocecal appendix can present as LUQ pain 4