What findings on anteroposterior and lateral skull X‑ray of a 2‑month‑old infant indicate a calcified cephalhematoma, and how should the lesion be managed based on its type?

Skull X-ray Findings and Management of Calcified Cephalhematoma in a 2-Month-Old Infant

On anteroposterior and lateral skull X-rays, a calcified cephalhematoma appears as a well-defined, elevated bony mass with peripheral rim calcification that does not cross suture lines, and for a 2-month-old infant, conservative observation is strongly recommended as spontaneous resolution typically occurs before age 2 years.

Radiographic Findings

The characteristic imaging features of calcified cephalhematoma include:

• Peripheral rim calcification forming a distinct outer shell (1.5-4.8 mm thick) 1
• Subperiosteal location confined by cranial sutures—the lesion does not cross suture lines
• Parietal location in the majority of cases 1
• Size range typically 18-55 mm 1
• Inner lamella contour that may be normal (Type 1) or depressed (Type 2) 2

While skull radiographs can detect the calcification, CT is superior for confirming calcifications and characterizing the full extent of the lesion 3. CT demonstrates the relationship between the inner and outer lamellae more clearly and helps classify the lesion type.

Classification System

Calcified cephalhematomas are classified based on inner lamella contour 2:

• Type 1: Normal contoured inner lamella—requires only outer lamella ostectomy if surgery needed
• Type 2: Depressed inner lamella—requires elevation of inner lamella with more complex reconstruction

Management Algorithm Based on Age and Presentation

For Infants Under 2 Years (Including Your 2-Month-Old Patient):

Conservative observation is the primary recommendation 2, 4, 5. The rationale:

• The cranium continues active growth during the first 2 years
• Spontaneous resolution occurs in many cases 5
• Complete remodeling can occur even after initial calcification 1

Temporal evolution studies demonstrate three possible outcomes 1:

1. Partial regression with approximation of inner and outer lamellae
2. Progressive resorption with increased bone thickness
3. Complete resolution without residual deformity

Indications for Early Intervention:

Surgery should be considered only if 2, 4:

• Secondary craniosynostosis develops
• Significant cosmetic disfigurement that is severe and progressive
• Neurological deficits (extremely rare)

If Surgery Becomes Necessary:

Early surgical intervention (before age 2) is technically easier 6 because:

• The calcified shell is thinner and less mature
• Less surgical trauma is required
• Cranioplasty may not be needed 6

The surgical approach depends on classification 2:

• Type 1 lesions: Simple ostectomy of outer lamella
• Type 2 lesions: Cap radial craniectomy technique or flip-over bull's-eye technique

Specific Recommendations for Your 2-Month-Old Patient:

1. Obtain baseline CT scan (not just X-ray) to fully characterize the lesion and classify as Type 1 or 2
2. Initiate observation protocol with clinical follow-up every 3-6 months
3. Repeat imaging at 6-12 months to document evolution 1
4. Continue observation until age 2 years unless complications develop
5. Reassess at age 2 for persistent deformity requiring surgical correction

Important Caveats:

• Do not perform aspiration at 2 months if calcification is already present—this is only effective for early, incompletely calcified lesions 2
• Avoid unnecessary early surgery as 70% of surgical cases required bone grafting in one large series 7, and 26.7% required blood transfusion 7
• Document the birth history (vacuum extraction, forceps use) as these are common risk factors 5
• Monitor for skull asymmetry as the primary clinical indicator for potential surgical need

The evidence strongly supports watchful waiting for infants under 2 years 2, 4, 5, with surgical intervention reserved for the minority who develop persistent deformity, craniosynostosis, or fail to remodel by age 2 years.