How should a 79-year-old female patient with new-onset right lower quadrant pain radiating to the umbilicus, soreness, no nausea, vomiting, or diarrhea, and regular bowel movements be evaluated and managed?

Immediate CT Abdomen/Pelvis with IV Contrast is the Diagnostic Test of Choice

This 79-year-old woman with new-onset RLQ pain radiating to the umbilicus requires urgent CT imaging of the abdomen and pelvis with intravenous contrast to evaluate for acute appendicitis and other serious pathology that is common in elderly patients.

Why Elderly Patients Require Immediate Imaging

In elderly patients presenting with RLQ pain, clinical examination and symptoms alone are unreliable and should NOT be used to exclude serious pathology 1. The elderly present with atypical features, delayed presentations, and higher rates of perforation and complications 1. Your patient's presentation—RLQ pain with radiation to the umbilicus and soreness—could represent:

• Acute appendicitis (most common surgical cause, but often atypical in elderly)
• Perforated appendicitis (elderly have significantly higher perforation rates due to diagnostic delays)
• Right-sided colonic diverticulitis (8% of RLQ pain cases)
• Cecal adenocarcinoma (can mimic appendicitis in elderly patients) 2
• Bowel obstruction (elderly with appendicitis often present with ileus/obstruction symptoms) 1
• Gangrenous cholecystitis (can present as RLQ pain in atypical cases) 3

The Specific Imaging Protocol

CT abdomen and pelvis with IV contrast (without oral contrast) is the single best test 4:

• Sensitivity: 95-96% and Specificity: 94% for appendicitis 4
• Identifies alternative diagnoses in 94.3% of non-appendicitis cases 4
• IV contrast alone (without oral contrast) has sensitivity 90-100% and specificity 94.8-100% 4
• No delay for oral contrast administration—critical in elderly where time to diagnosis directly impacts perforation risk and mortality 1

Why NOT Oral Contrast

Oral contrast delays diagnosis without improving accuracy and may increase perforation risk in elderly patients who already present late 4. The evidence shows no significant difference between CT with oral contrast versus IV contrast alone 4.

Critical Clinical Pitfalls in Elderly Patients

The elderly do NOT present like younger patients 1:

• Only a minority have the classic triad of migrating RLQ pain, fever, and leukocytosis 1
• 30-80% may have fever (highly variable) 1
• Many present with signs of ileus or obstruction rather than classic appendicitis 1
• Significantly more peritoneal signs (distension, generalized tenderness, guarding, rebound, palpable mass) because they present later with more advanced disease 1
• Comorbidities and medications (especially in a 79-year-old) can mask typical inflammatory responses 1

What to Do While Arranging Imaging

1. Ensure hemodynamic stability 5
2. Obtain basic labs: CBC, CRP, electrolytes, creatinine, urinalysis 5
   • Note: Normal inflammatory markers do NOT exclude appendicitis in elderly, but elevated WBC and CRP have 100% negative predictive value when both are normal 1
3. NPO status (patient may need surgery)
4. IV access and fluid resuscitation if needed
5. Do NOT delay imaging for clinical scoring systems—Alvarado score is suggested only for excluding appendicitis with low scores, not for diagnosing it 1

Why Ultrasound is NOT Appropriate Here

While ultrasound is first-line in children and pregnant women 6, it is not recommended as initial imaging in elderly patients with nonspecific RLQ pain 4. CT provides:

• Superior visualization of the appendix in elderly (often retrocecal, difficult to visualize on US)
• Comprehensive evaluation for the broad differential diagnoses common in this age group
• Detection of malignancy (cecal cancer can present identically to appendicitis in elderly) 2

The Bottom Line Algorithm

For a 79-year-old with RLQ pain:

1. Stabilize → Labs → Immediate CT abdomen/pelvis with IV contrast
2. Do not wait for oral contrast or attempt clinical diagnosis alone
3. Surgical consultation should occur simultaneously with imaging, not after
4. If CT shows appendicitis → urgent surgery (elderly have worse outcomes with delay)
5. If CT shows alternative diagnosis → treat accordingly (41% of non-appendicitis diagnoses require hospitalization, 22% need intervention) 4

The absence of nausea, vomiting, or diarrhea does NOT exclude serious pathology—elderly patients with appendicitis frequently lack these "typical" symptoms 1.