craniofacial

Lambdoid Craniosynostosis

What is Lambdoid Craniosynostosis?

Lambdoid craniosynostosis is a rare form of craniosynostosis, a condition where one or more of the skull sutures fuse prematurely. The lambdoid suture runs along the back of the head, connecting the occipital bone with the parietal bones. When this suture fuses too early, it restricts growth in the back of the skull, leading to an asymmetric, flattened appearance on the affected side. This results in a condition known as posterior plagiocephaly. Unlike positional plagiocephaly, which is caused by external pressure on the skull, lambdoid craniosynostosis involves actual bone fusion.

The Procedure

How is it Diagnosed?

Lambdoid craniosynostosis is diagnosed through a combination of clinical examination and imaging studies. A physical exam may reveal flattening at the back of the head, a low-set or tilted ear on the affected side, and a skull that does not improve with repositioning. Unlike positional plagiocephaly, the neck muscles are typically not tight. Diagnosis is confirmed using imaging, most commonly a CT scan with 3D reconstruction, which shows premature fusion of the lambdoid suture and allows assessment of skull shape and suture involvement.

What Are the Causes?

The exact cause of lambdoid craniosynostosis is unknown in most cases. It generally occurs sporadically and is not inherited. In rare cases, it may be associated with genetic syndromes involving multiple suture fusions. Environmental influences or intrauterine constraints may play a role, though no definitive factors have been consistently identified. Genetic evaluation may be considered if there are signs of multiple suture involvement or other congenital anomalies.

What Are the Implications?

The main implications of lambdoid craniosynostosis involve skull shape and potential pressure on the brain. The premature fusion of the lambdoid suture leads to flattening on the affected side, often with compensatory bulging on the opposite side. The ear on the fused side may be displaced downward and backward. In some cases, untreated lambdoid synostosis may result in increased intracranial pressure.

Cosmetically, the head may appear asymmetric from the rear view, which can affect the child’s appearance and self-esteem. Differentiating this condition from positional plagiocephaly is critical, as the treatment approaches are very different.

What Are the Treatment Options?

Surgical intervention is typically required to correct lambdoid craniosynostosis, particularly in moderate to severe cases. The goal of surgery is to reshape the skull, relieve any pressure on the brain, and allow for normal growth.

Cranial Vault Remodeling: This is the standard treatment involving removal and reshaping of the affected portions of the skull. The surgery is usually performed between 6 and 12 months of age.
Minimally Invasive Techniques: These may be considered in select early-diagnosed cases.

What Are the Possible Complications?

Surgery carries the typical risks associated with cranial procedures, including:

Infection or bleeding
Anesthesia-related complications
Residual or recurrent skull deformity
Need for additional surgeries
Neurological complications

With early diagnosis and appropriate treatment, most children with lambdoid craniosynostosis can achieve good cosmetic and developmental outcomes, though long-term follow-up is recommended.