Sefalhematoma

01Pathophysiology

Cephalhematoma results from traumatic rupture of blood vessels that run between the periosteum and the outer table of the skull bone. During delivery, shearing forces act on the fetal head as it passes through the birth canal. These forces are amplified by the use of vacuum extractors or forceps, which grip the scalp and transmit traction directly to the subperiosteal plane. The ruptured vessels, typically small emissary or diploic veins, bleed slowly into the space between the periosteum and bone.

The reason this swelling does not cross suture lines is anatomical: the periosteum is tightly adherent to the skull at each suture line. This creates a sealed compartment over a single cranial bone, most commonly the parietal bone (unilateral in most cases, bilateral in roughly 5 to 15%). Because the bleeding is subperiosteal and slow, the swelling often is not immediately apparent at birth. It typically becomes noticeable several hours after delivery and may continue to enlarge over the first 48 hours as blood continues to accumulate. This delayed onset is a frequently tested feature.

Over days to weeks, the periphery of the hematoma begins to calcify as the periosteum lays down new bone in response to the hemorrhage. This can create a raised, firm rim around the edges of the swelling, sometimes giving the false impression of a depressed skull fracture (the center feels soft relative to the calcified rim). This rim calcification is not pathological and remodels over weeks to months.

The clinical consequence of sequestered blood is its eventual breakdown. As red blood cells within the hematoma lyse, they release unconjugated bilirubin into the circulation, which can contribute to neonatal jaundice. This is the most common complication and the one most likely to require intervention (phototherapy). In large hematomas, the volume of trapped blood can also contribute to anemia, though this is less common than with subgaleal hemorrhage.

02Classification and Clinical Manifestation

03Diagnostic Workup

Clinical examination is both the best initial test and, in the vast majority of cases, the only test needed. The diagnosis is made at the bedside. The hallmark finding is a swelling that respects suture lines, is firm and fluctuant, does not transilluminate (unlike caput succedaneum), and appears or worsens hours after birth rather than being present immediately.

Imaging is reserved for atypical presentations. A skull radiograph is warranted when you suspect an underlying fracture, which occurs in a meaningful minority of cases (approximately 5 to 18%). The fracture itself is usually linear and nondisplaced, requiring no intervention, but it changes the monitoring plan. If the clinical picture raises concern for intracranial involvement (seizures, poor feeding, altered consciousness), a CT head without contrast is the appropriate next step.

Laboratory studies are not part of the routine workup. However, because the hematoma acts as a reservoir of extravascular blood that will undergo hemolysis, you should monitor for rising unconjugated bilirubin clinically. Order a serum bilirubin level if jaundice becomes visible or if the infant falls into a high-risk zone on a bilirubin nomogram (Bhutani curve).

04Management and Treatment

The cornerstone of management is expectant observation. The hematoma will resorb on its own. Parents should be counseled that the swelling may feel harder over the first few weeks as the rim calcifies, and this is normal. Full resolution typically takes 2 weeks to 3 months, with the calcified rim remodeling last.

The single most important management rule, and the one most frequently tested, is: do not aspirate or incise the hematoma. Aspiration introduces a pathway for bacterial infection into a closed, sterile space and increases the risk of abscess formation and osteomyelitis. The only exception is a hematoma that has already become infected (fever, erythema, warmth, fluctuance with purulent characteristics), which is exceedingly rare.

For hyperbilirubinemia, treatment follows the same phototherapy guidelines as any other cause of neonatal jaundice. Plot the total serum bilirubin against the infant's age in hours using the Bhutani nomogram. If the value exceeds the phototherapy threshold for the infant's risk category, initiate phototherapy. The presence of a cephalhematoma is itself considered a risk factor for severe hyperbilirubinemia per the American Academy of Pediatrics guidelines, so these infants should have a lower threshold for bilirubin monitoring before discharge.

There is no role for prophylactic antibiotics, compression bandaging, or surgical evacuation in routine cephalhematoma management.

05Differential Diagnosis and Distractors

06Traps and High-Yield Pearls

The single most common way students lose points on cephalhematoma questions is by confusing it with caput succedaneum or subgaleal hemorrhage. Test-writers exploit the overlapping feature of "scalp swelling in a newborn" and rely on two discriminating details to separate the three: (1) whether the swelling crosses suture lines, and (2) the timing and clinical trajectory. If the vignette says "present at birth, soft, crosses the midline," that is caput. If the vignette says "rapidly enlarging, crosses sutures, infant is tachycardic and pale," that is subgaleal hemorrhage and requires emergent resuscitation. If the vignette says "firm swelling over the right parietal bone noted 12 hours after vacuum-assisted delivery, does not cross the suture," that is cephalhematoma, and the answer is observation.

A second trap involves management. A question may describe a large cephalhematoma and offer aspiration or surgical drainage as an answer choice. This is always wrong unless the stem explicitly describes signs of infection. Choosing aspiration is the intended distractor for students who reason that "draining the blood would speed recovery." The tested principle is that violating a closed, sterile space creates iatrogenic risk that outweighs any benefit.

Finally, be alert to the jaundice connection. A vignette may present a 3-day-old infant with jaundice and a resolving scalp mass. The question is testing whether you recognize that the cephalhematoma is the source of the bilirubin load. The correct next step is to check a serum bilirubin level and manage per the phototherapy nomogram, not to image the head or aspirate the hematoma.

The core competency being tested across all cephalhematoma questions is anatomical localization of neonatal scalp hemorrhage and its implications for severity, prognosis, and management.