caput succedaneum

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Caput Succedaneum

Definition: Superficial hemorrhagic edema between the skin and the epicranial aponeurosis (the most superficial layer), occurring over the presenting part of the fetal head during delivery. It results from pressure against the cervix compressing local tissue.

Anatomy & Layer

As shown in the diagram below, caput succedaneum is the most superficial of the birth-related extradural fluid collections — above the epicranial aponeurosis, directly under the skin:

Sagittal diagram showing layers of neonatal skull with caput succedaneum, cephalohematoma, subgaleal hemorrhage, and extradural hemorrhage labeled relative to skin, epicranial aponeurosis, periosteum, skull, and dura

— Harriet Lane Handbook, 23rd ed.

Clinical Features

Feature	Caput Succedaneum
Location	At point of contact; crosses suture lines
Feel	Soft, vaguely demarcated, pitting edema; shifts with gravity
Timing	Maximal at birth; resolves within 48–72 hours
Associated findings	Petechiae and ecchymosis may be present
Severity	Minimal; generally benign

Pathophysiology

Prolonged pressure of the cervix on the presenting fetal scalp leads to interstitial fluid accumulation and subcutaneous edema. Because the edema is superficial (above the epicranial aponeurosis), it is not confined by suture lines and can spread freely across the scalp.

Comparison with Similar Conditions

	Caput Succedaneum	Cephalohematoma	Subgaleal Hemorrhage
Layer	Above epicranial aponeurosis	Subperiosteal (below periosteum)	Below aponeurosis, above periosteum
Suture lines	Crosses freely	Does NOT cross	Does NOT cross
Onset	Present at birth	Increases 12–24 h after birth	Progressive after birth
Resolution	48–72 hours	Weeks	Weeks
Severity	Minimal	Rarely severe	Can be life-threatening (hemorrhagic shock)
Cause	Cervical pressure	Vacuum/forceps; rupture of diploic/emissary veins	Vacuum extraction; coagulopathy

Complications

Hyperbilirubinemia: resorption of blood/edema fluid can contribute to neonatal jaundice (a consideration with all extracranial hemorrhages).
No treatment is required. The edema resolves spontaneously.

Key Distinguishing Point (exam pearl)

Caput succedaneum crosses suture lines and is present at birth — both features distinguish it from cephalohematoma, which is bounded by sutures and may enlarge after birth.

Sources: Fitzpatrick's Dermatology, Vol. 1–2; Harriet Lane Handbook, 23rd ed.; Bradley and Daroff's Neurology in Clinical Practice

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