Appendix Mass Management
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Direct answer
Five days of right iliac fossa pain with a palpable, fixed, surprisingly non-tender mass is an appendicular mass — omentum and bowel walled off around a perforated appendix — and it is managed conservatively, not by immediate appendicectomy. The Ochsner-Sherren regimen couples intravenous antibiotics with strict four-hourly monitoring of pulse, temperature and the mass; improvement proceeds to resolution, classically followed by consideration of interval appendicectomy after six to eight weeks. A mass that swells or fails to improve is an appendicular abscess — drain it percutaneously under ultrasound or CT guidance. Two exceptions break the rule: generalised peritonitis at presentation is an immediate operation, and the elderly patient needs colonoscopy or CT after resolution, because caecal carcinoma can present exactly as an appendicular mass.
What you must remember
- Why conservative: after three to five days the inflammatory mass is dense and vascular; dissecting it tears an oedematous caecum and converts a contained phlegmon into spreading sepsis.
- Ochsner-Sherren content: hospitalise, intravenous fluids, antibiotics (co-amoxiclav or ceftriaxone with metronidazole in Indian wards), and four-hourly charting of pulse, temperature, size of the mass and peritonism; success is a falling pulse and temperature with a shrinking mass over 48-72 hours.
- Failure criteria: rising pulse, persistent or swinging fever, an enlarging mass, and spreading tenderness or rigidity — any one abandons conservatism in favour of imaging and intervention.
- Appendicular abscess: fluctuance or swinging fever with an ultrasound or CT collection — percutaneous pigtail drainage is first choice; open drainage when inaccessible; appendicectomy may be impossible and is left for later.
- Interval appendicectomy controversy: traditionally at six to eight weeks, now increasingly omitted because recurrence runs only about 10-20%; it is offered selectively — to children, to recurrent pain, and after imaging has excluded caecal pathology.
- The elderly rule: anyone over about forty gets colonoscopy or CT colonography after resolution, because caecal carcinoma, appendicular carcinoid or mucocele can masquerade as an appendicular mass.
- Indian reality: patients often arrive after days of native remedies, so appendicular masses and contained abscesses are proportionally far commoner than in Western practice.
Ochsner-Sherren, hour by hour
A 25-year-old man gives five days of right iliac fossa pain, native-treatment delay, and now a well-defined, barely tender mass. He is admitted, kept nil by mouth with intravenous fluids, and started on ceftriaxone with metronidazole. The heart of the regimen is the four-hourly chart: pulse, temperature, abdominal examination, mass size measured or carefully palpated. Day one, pulse 96, temperature 38 °C, mass 8 cm. Day two, pulse 82, afebrile, mass 7 cm — the trend is winning, and nothing else changes. By day six the mass is 4 cm, he is eating, and he leaves with oral antibiotics and a six-week review. At review he is well; a CT or colonoscopy is arranged if he is over forty; interval appendicectomy is discussed and, in most modern units, declined unless symptoms recur.
Now the same chart failing: day two, pulse rising 100 to 112, swinging fevers, mass now 12 cm with spreading tenderness. This is the absessforming phase — cross-sectional imaging confirms a 6 cm collection, and a pigtail catheter drains 80 mL of pus. He still avoids a laparotomy. The only patient of the three who goes straight to theatre is the one who arrives with generalised peritonism and rigidity from the outset — a perforation that never got contained.
The elderly appendix mass trap
The mass over forty is cancer until imaging says otherwise: a caecal carcinoma obstructing the appendiceal lumen produces appendicitis-like inflammation and a mass, and operating on it as an "appendicular abscess" meets a tumour instead. Hence the drilled sequence — resuscitate, image, drain if pus, then colonoscopy or CT colonography before attaching the label "appendicular". NBE asks this topic as a management MCQ where "immediate appendicectomy" is the classic wrong answer, "conservative management with Ochsner-Sherren" the right one, and "percutaneous drainage" the next step once an abscess forms. The interval appendicectomy question is answered "selective, not routine" in current practice — a modern update worth quoting.
Frequently asked questions
What is the Ochsner-Sherren regimen?
Conservative management of an appendicular mass — hospitalisation, intravenous antibiotics and fluids with four-hourly monitoring of pulse, temperature, mass size and peritonism.
When is conservatism abandoned?
Rising pulse, persistent or swinging fever, an enlarging mass, or spreading peritonism — each demands imaging, drainage of abscess, or surgery.
Is interval appendicectomy still routine?
No longer automatic — recurrence is only 10-20%, so it is offered selectively to children, recurrent symptoms, and after excluding caecal pathology in older patients.
Why colonoscopy after resolution in patients over forty?
Because caecal carcinoma can present as an appendicular mass by obstructing the appendix, and missing it behind an "appendicitis" label delays the real diagnosis.
What is the first treatment of an appendicular abscess?
Image-guided percutaneous drainage under ultrasound or CT, reserving open drainage for inaccessible collections.