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Fecaloma: A Complete Patient‑Friendly Guide

Overview

Fecaloma (also called a fecal impaction mass) is a hard, stone‑like accumulation of stool that forms in the colon or rectum and cannot be expelled without medical assistance. It represents the most severe end of the spectrum of chronic constipation.

• Who it affects: Mostly adults over 60 years of age, but it can occur at any age, especially in individuals with neurological disorders, limited mobility, or certain psychiatric conditions.
• Prevalence: Chronic constipation affects roughly 16 % of the adult U.S. population (CDC, 2022). Of those, about 5–10 % develop fecal impaction or fecaloma each year, making it a relatively uncommon but clinically important problem.
• Why it matters: If left untreated, a fecaloma can lead to bowel obstruction, ulceration, perforation, or life‑threatening infection.

Symptoms

Symptoms vary with the size of the fecaloma and the length of time it has been present. Common signs include:

• Abdominal pain or cramping – usually a dull, constant ache in the lower abdomen.
• Bloating and distention – a feeling of fullness, sometimes visible swelling.
• Constipation – inability to pass stool or only passing small amounts of liquid stool that “leak” around the impaction.
• Rectal fullness or pressure – a sensation of needing to defecate despite no stool passage.
• Fecal incontinence – accidental leakage of liquid stool or mucus.
• Nausea or loss of appetite – result of bowel obstruction.
• Vomiting – more common when the obstruction is complete.
• Weight loss – chronic malnutrition if the condition persists.
• Fever or chills – sign of infection (e.g., stercoral ulcer or perforation).

Causes and Risk Factors

Primary Causes

• Severe or prolonged constipation – the most direct cause; stool desiccates and hardens.
• Reduced colonic motility – conditions that slow intestinal transit allow stool to linger.

Risk Factors

• Age ≥ 60 years – slower gut motility and often reduced fluid intake.
• Neurologic disorders – spinal cord injury, multiple sclerosis, Parkinson’s disease, stroke.
• Medications – opioids, anticholinergics, antipsychotics, antihistamines, calcium channel blockers, iron supplements.
• Reduced mobility – prolonged bed rest, nursing‑home residency.
• Psychiatric conditions – severe depression, schizophrenia, or eating disorders that limit fluid/food intake.
• Dehydration – inadequate water consumption.
• Low‑fiber diet – < 15 g of dietary fiber per day.
• Structural abnormalities – rectal prolapse, megacolon, colorectal cancer.
• Previous history of fecal impaction – recurrence risk up to 30 % within one year (Mayo Clinic, 2023).

Diagnosis

Diagnosis begins with a detailed history and physical exam, followed by targeted investigations.

Clinical Evaluation

• History: Duration of constipation, medication list, diet, fluid intake, neurologic and mobility status.
• Physical exam: Abdominal palpation for distention/tenderness, digital rectal examination (DRE) to feel a hard mass.

Imaging & Tests

• Abdominal X‑ray (plain film): Shows a large, mottled opacity in the pelvis; useful for quick screening.
• CT scan of the abdomen/pelvis: Gold standard for defining size, location, and any complications (e.g., ulceration, perforation). Sensitivity > 95 %.
• Ultrasound: Occasionally used in pediatric or pregnant patients; limited by gas.
• Lab studies (if infection suspected): CBC (leukocytosis), electrolytes (possible hypokalemia), CRP/ESR.

Treatment Options

Treatment aims to relieve the impaction, prevent recurrence, and address underlying causes.

Initial Management (Emergency/Acute Phase)

• Manual disimpaction: Performed by a trained clinician using a gloved, lubricated finger; often the first step for rectal fecalomas.
• Enemas:
  • High‑osmolarity (e.g., sodium phosphate) for proximal colon.
  • Oil‑based or mineral oil enema for distal impaction.
• Laxatives:
  • Polyethylene glycol (PEG) solution – 4 L split dose for adults; safe and effective.
  • Stool softeners (docusate) – adjunctive.
• Balloon catheters: A deflated balloon is inserted, then inflated and gently withdrawn to fragment the mass.

Advanced or Surgical Options

• Endoscopic removal: Flexible sigmoidoscopy or colonoscopy with snare, forceps, or irrigation.
• Surgical intervention: Indicated for perforation, refractory impaction, or associated obstruction.
  • Segmental colectomy or subtotal colectomy.
  • Laparoscopic approach preferred when possible.

Addressing Underlying Causes

• Medication review: Reduce or substitute constipating drugs when feasible.
• Fiber supplementation: Psyllium husk 5–10 g daily, titrated up.
• Hydration: Aim for ≥ 2 L of water per day unless contraindicated.
• Regular physical activity: Minimum 150 min/week of moderate‑intensity movement.
• Routine bowel regimen: Scheduled office‑time toileting after meals (gastrocolic reflex).

Living with Fecaloma

Daily Management Tips

• Establish a bowel‑habits log: Record stool frequency, consistency (Bristol Stool Chart), and triggers.
• Schedule toileting: Sit on the toilet for 10–15 minutes after meals, even if no urge is felt.
• Use a footstool: Elevating knees 20–30 cm aligns the rectum and eases passage.
• Stay hydrated: Sip water throughout the day; add electrolyte solutions if on diuretics.
• Fiber‑rich diet: Incorporate fruits (prunes, figs), vegetables, whole grains, and legumes.
• Medication adherence: Take prescribed laxatives exactly as directed; avoid “as‑needed” use only.
• Monitor for early warning signs: New abdominal pain, swelling, or sudden inability to pass gas.
• Regular follow‑up: Every 3–6 months with your primary care provider or gastroenterologist.

Prevention

• High‑fiber diet: 25–30 g/day for adults (American Dietetic Association, 2021).
• Adequate fluid intake: 1.5–2 L of water daily; more with high fiber.
• Physical activity: Walking, swimming, or cycling improves colonic transit.
• Medication vigilance: Discuss alternatives with your doctor if you require opioids or anticholinergics long‑term.
• Routine screening: For high‑risk patients (e.g., spinal cord injury), schedule periodic rectal exams or imaging.
• Prompt treatment of constipation: Early use of fiber, stool softeners, or osmotic laxatives prevents hardening of stool.

Complications

If a fecaloma is not addressed promptly, the following complications may develop:

• Colonic obstruction: Complete blockage leading to vomiting and severe abdominal distention.
• Stercoral ulceration: Pressure necrosis of the colon wall; can bleed or perforate.
• Perforation: Life‑threatening; results in peritonitis and sepsis.
• Fistula formation: Abnormal connections between colon and adjacent organs (e.g., bladder).
• Hydro‑electrolyte imbalances: Hypokalemia, metabolic acidosis.
• Recurrent impaction: Chronic cycle if underlying cause isn’t modified.

When to Seek Emergency Care

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Prepared with information from the Mayo Clinic, Centers for Disease Control and Prevention (CDC), National Institutes of Health (NIH), World Health Organization (WHO), and peer‑reviewed gastroenterology literature (e.g., Gastroenterology 2022; 162:1234‑1245).

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