A 32-year-old woman presents with a surgical wound 8 weeks post-abdominoplasty that shows excessive collagen deposition confined to the incision line with a firm, raised appearance. Which feature best distinguishes this finding from a pathologic keloid?

Question

Accepted Answer

C. The lesion does not extend beyond the original surgical scar boundaries. ## Hypertrophic Scar vs. Keloid: Clinical Discrimination

### Case Context

The patient has a post-surgical scar (8 weeks post-op) with excessive fibrosis confined to the incision line. This clinical presentation is classic for a hypertrophic scar, not a keloid.

### Boundary as the Primary Discriminator

**Key Point:** The spatial confinement of the scar tissue to the original wound margin is the single best clinical feature that distinguishes hypertrophic scars from keloids.

### Comparative Table

| Criterion | Hypertrophic Scar | Keloid |
|-----------|-------------------|--------|
| **Boundary Behavior** | Stays within original wound margin | Breaches and extends beyond original margin |
| **Clinical Presentation** | Raised, firm, confined scar | Raised, firm, extends into normal skin |
| **Post-op Timeline** | Typically 4–12 weeks | Can appear weeks to years later |
| **Spontaneous Regression** | Common (1–2 years) | Rare; persists indefinitely |
| **Ethnic Predisposition** | Minimal | Increased in darker skin phenotypes |
| **Recurrence After Excision** | ~5–15% | ~45–50% |

### Why Boundary Matters

**High-Yield:** The breach of the original wound boundary indicates autonomous, pathologic fibroblast proliferation that is characteristic of keloid formation. Confinement within the boundary suggests a self-limited, exaggerated but ultimately normal wound-healing response (hypertrophic scar).

### Clinical Pearl

In the operating room or clinic, the simplest question to ask: "Does the raised scar tissue stay within the scar line, or does it spill into normal skin?" If confined → hypertrophic; if spilling → keloid. This distinction drives management: hypertrophic scars often improve with time and conservative measures (pressure garments, silicone), whereas keloids require more aggressive intervention (intralesional steroids, radiation, surgical excision with adjuvant therapy).

### Mnemonic

**"SCAR STAYS IN ITS LANE" = Hypertrophic**

**"SCAR INVADES NEXT LANE" = Keloid**

Answer

A. The patient reports pruritus and pain at the site

Answer

B. The lesion appeared within 4 weeks of surgery

Answer

D. Histology shows organized collagen parallel to the skin surface

A 32-year-old woman presents with a surgical wound 8 weeks post-abdominoplasty that shows excessive collagen deposition confined to the incision line with a firm, raised appearance. Which feature best distinguishes this finding from a pathologic keloid?

Explanation

Hypertrophic Scar vs. Keloid: Clinical Discrimination

Case Context

Boundary as the Primary Discriminator

Comparative Table

Why Boundary Matters

Clinical Pearl

Mnemonic

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Criterion	Hypertrophic Scar	Keloid
Boundary Behavior	Stays within original wound margin	Breaches and extends beyond original margin
Clinical Presentation	Raised, firm, confined scar	Raised, firm, extends into normal skin
Post-op Timeline	Typically 4–12 weeks	Can appear weeks to years later
Spontaneous Regression	Common (1–2 years)	Rare; persists indefinitely
Ethnic Predisposition	Minimal	Increased in darker skin phenotypes
Recurrence After Excision	~5–15%	~45–50%