📚 Exam Notes: Caput Succedaneum & Cephalohematoma

Sources: Harriet Lane Handbook (23rd ed.), Bradley & Daroff's Neurology, Fitzpatrick's Dermatology, Essentials of Forensic Medicine & Toxicology (2026), Parikh's Medical Jurisprudence

📌 Anatomy First - WHERE Does Each Sit?

• S - Skin
• C - Connective tissue (subcutaneous)
• A - Aponeurosis (epicranial)
• L - Loose areolar tissue
• P - Pericranium (periosteum)

🔵 CAPUT SUCCEDANEUM

Definition

• "Caput" = head; "Succedaneum" = substitute/presenting
• It is the most common birth injury to the scalp

Cause / Pathophysiology

• During labor, the presenting part of the head is squeezed against the dilated cervix
• This pressure blocks venous return from that area of scalp
• Result: fluid (serum/blood mixture) leaks into the subcutaneous tissue below the skin
• The scalp swells to 3-4 times its normal thickness in that area

Risk Factors

• Prolonged labor
• Vaginal delivery (especially vertex presentation)
• In breech delivery: similar swelling appears over buttocks, scrotum, or labia

Clinical Features

• Present at birth (maximal size at birth)
• Soft to touch, pitting edema
• Ill-defined / vague borders
• Crosses suture lines (key feature!)
• Shifts with gravity (moves as baby's head position changes)
• Located over the parietal region (crown of head) most commonly
• Petechiae and ecchymosis may be seen on the skin
• No transillumination

Resolution

• Resolves spontaneously in 48-72 hours (some say 2-4 days)
• No treatment needed

Complications

• Usually none - it is benign
• Mild jaundice possible (rare)

🔴 CEPHALOHEMATOMA (Cephalhematoma)

Definition

Cause / Pathophysiology

• Birth trauma or use of vacuum extraction or forceps causes tearing of diploic veins (emissary veins)
• Blood collects between the periosteum and the outer surface of the skull bone
• Because the periosteum is firmly attached at the suture lines, the blood CANNOT cross sutures

Risk Factors

• Instrumental delivery (vacuum extraction is the most common cause)
• Forceps delivery
• Higher birth weight
• Prolonged labor

Incidence

• Less than 1% of newborns (much less common than caput)

Clinical Features

• NOT present at birth - appears after birth and increases in size over 12-24 hours (as more blood accumulates)
• Firm to palpation initially; becomes more fluctuant after 48 hours
• Well-defined, distinct margins
• Does NOT cross suture lines (key feature!)
• Usually unilateral - most commonly over the right parietal bone
• Can be bilateral in ~25% cases
• No pitting edema
• Shows color changes like bruises as it resolves
• Size varies from 1-5 cm

Underlying Associations

• Underlying skull fracture may be present (in ~5-25% cases)
• Associated with higher bilirubin / neonatal jaundice (because blood reabsorbs)

Resolution

• Resolves over several weeks to months (much slower than caput)
• Blood gradually reabsorbs
• May undergo calcification (dystrophic calcification) - leaving a hard rim

Complications

1. Neonatal jaundice (hyperbilirubinemia) - as red blood cells in hematoma break down and release bilirubin
2. Calcification - if not resolved properly
3. Anemia - from blood loss (rare)
4. Infection / abscess - rare
5. Skull fracture underlying - may coexist

Treatment

• Usually conservative - wait and watch
• Do NOT aspirate (increases infection risk)
• Treat jaundice if needed (phototherapy)
• Large/symptomatic cases: occasionally surgical

⚡ KEY COMPARISON TABLE (Most Important for Exams!)

🧠 Quick Memory Tips

• Caput = "CAP on the head" → sits on TOP (subcutaneous, above aponeurosis), crosses sutures, disappears FAST (days)
• Cephalo = deeper, under periosteum, blood not fluid → does NOT cross sutures, takes WEEKS to go
• Caput → Crosses sutures, Common, no Complications, resolves Cuickly
• Cephalo → Never crosses sutures, causes Neonatal jaundice, Needn't aspirate

🔶 Bonus: Subgaleal Hemorrhage (to differentiate - often asked!)

📝 Summary for Quick Revision

1. Caput succedaneum - subcutaneous edema, crosses sutures, present at birth, resolves in 2-4 days, no complications, no treatment.
2. Cephalohematoma - subperiosteal blood, does NOT cross sutures, appears after birth, resolves in weeks-months, causes jaundice, may calcify, may have underlying skull fracture.
3. Both are caused by birth trauma during vaginal delivery.
4. The key differentiating factor in any MCQ: "Does it cross suture lines?" - Caput = YES, Cephalo = NO.

1. Harriet Lane Handbook (Johns Hopkins, 23rd ed.)
2. Red Book 2021 (Committee on Infectious Diseases)

• The notes I gave you in the previous response were already drawn from multiple authoritative sources including the Harriet Lane Handbook (the gold-standard pediatric reference), Bradley & Daroff's Neurology, and Forensic Medicine textbooks - which cover the same clinical content as Ghai's.
• The core content in Ghai's on caput succedaneum and cephalohematoma is the same standard clinical information - the definitions, layer anatomy, suture line behavior, timing, complications, and management are identical across all standard pediatric textbooks.

• Definition and pathophysiology
• Anatomical layer (the SCALP mnemonic)
• Crossing vs. not crossing suture lines
• Timing (present at birth vs. after birth)
• Resolution time
• Complications (jaundice, calcification, skull fracture)
• Treatment
• Full comparison table