Pectus Excavatum in Cats & Kittens: A Vet’s 2025 Guide to Recognition, Diagnosis & Treatment 🐾

Hi there! I’m Dr. Duncan Houston BVSc, veterinarian and founder of Ask A Vet. In this extended 2025 guide, we’ll explore pectus excavatum, also known as “funnel chest,” a congenital or developmental deformity in kittens and cats. You’ll learn how to identify a sunken sternum, assess severity, navigate diagnostics, understand conservative and surgical treatment options, and support your pet through recovery with expert care and empathy.

📘 1. What Is Pectus Excavatum?

Pectus excavatum is a deformity where the caudal sternum and adjacent ribs grow abnormally, causing the chest to cave inward—like a funnel. While some mildly affected kittens show no initial signs, significant deformity can compress the heart and lungs, leading to breathing distress and exercise intolerance over time :contentReference[oaicite:3]{index=3}.

🐾 2. Who Is at Risk & When It Shows Up

• Congenital: Typically present at birth; more visible as kittens grow :contentReference[oaicite:4]{index=4}.
• Breeds impacted: Burmese and Bengal are predisposed, though any cat can be affected :contentReference[oaicite:5]{index=5}.
• Severity spectrum: Ranges from mild/cosmetic to life-threatening cardiac/respiratory compromise :contentReference[oaicite:6]{index=6}.

🔍 3. Recognizing the Signs

• Visible chest depression—especially behind the brisket
• Increased respiratory rate, exercise intolerance, or cyanosis
• Growth delays, recurrent respiratory infections
• Heart murmurs, tachycardia, or signs of pulmonary hypertension

🧭 4. Diagnostic Approach

4.1 Physical Examination

Palpation reveals a concave sternum and possible scoliosis.

4.2 Radiographs & Quantitative Indices

• Thoracic X-rays assess deformity and its effect.
• Vertebral index (VI) and frontosagittal index (FSI) determine severity (normal VI: ~12–19; FSI: ~0.7–1.3) :contentReference[oaicite:7]{index=7}.
• CT imaging offers detailed anatomy and surgical planning insights :contentReference[oaicite:8]{index=8}.

4.3 Additional Diagnostics

• Echocardiogram or blood pressure check if clinical signs suggest cardiac compromise.
• Pulse oximetry or blood gas analysis in severe cases.

🛠️ 5. Treatment Options**

5.1 Conservative Splinting (Non-invasive)

Ideal for kittens under ~4 months with pliable sternum:

• External splint molded to convex chest shape, secured via circumsternal sutures using padding and monitoring to prevent sores or bracing complications :contentReference[oaicite:9]{index=9}.
• Splint remains in place for 4–8 weeks, with weekly checks, protective rest, and radiographs every 2 weeks :contentReference[oaicite:10]{index=10}.
• Risks: pneumothorax, re-expansion pulmonary edema, dermatitis, infection :contentReference[oaicite:11]{index=11}.

5.2 Surgical Repair (Internal Fixation)

• Recommended for cats older than 4 months or with severe deformity.
• Procedures include:
  • Open sternectomy or osteotomy + internal plating
  • Thoracoscopic-assisted repair using locking compression plates, especially helpful in breeds like Maine Coons :contentReference[oaicite:12]{index=12}.
• Post-op risks include hemorrhage, pneumothorax, re-expansion pulmonary edema, implant infection; care typically includes ICU monitoring for 24–48 hours.

📈 6. Prognosis & Follow-up

• Mild cases treated early often thrive fully post-recovery.
• Moderate cases managed with splinting frequently improve significantly.
• Severe cases require surgery; prognosis depends on timely intervention and complication management but can be good with high-quality care.
• Recurrence after successful treatment is uncommon :contentReference[oaicite:13]{index=13}.

🏡 7. Home & Supportive Care

• Ensure restricted activity; follow follow-up schedule carefully.
• Pain management: NSAIDs or opioids post-op.
• Keep splint clean and monitor for skin issues.
• Use environment enrichment that avoids physical strain.
• Regular weigh‑ins, appetite tracking, and breathing monitoring.
• Track all data in the Ask A Vet app for reminders and tele-support.

📚 8. Case Studies

“Apple” (Kitten, 3 weeks)

Presented with moderate deformity, managed via splinting and rest. Splint removed after 5 weeks; X-rays confirmed correction. Apple now thrives, with no respiratory concerns.

“Luna” (4‑mo Maine Coon)

Severe deformity with exercise intolerance underwent thoracoscopic-assisted plate fixation. Rechecks at 12 months show full thoracic remodeling, excellent respiratory function.

🚨 9. When to Seek Emergency Help

• Sudden breathing difficulty, collapse, cyanosis
• Sprains or breaks in the splint
• Drainage, infection, or pressure sores under brace
• Signs of pneumothorax or respiratory compromise

✨ 10. Final Thoughts

Pectus excavatum is a serious yet treatable condition with modern veterinary tools. With early diagnosis, informed decision-making, and personalized care, most kittens and cats can recover respiratory health and enjoy a normal life. The Ask A Vet app provides monitoring templates, medication reminders, tele-support, and recovery guidance tailored to your cat. You don’t have to navigate this alone—help is just a tap away 🐾❤️.

For custom care plans, remote support, or pectus excavatum toolkits, visit AskAVet.com or download the Ask A Vet app.