Infantile Calcifying Pseudoneoplasm of the Neuraxis (CAPNON) at the Craniocervical Junction with Postoperative Craniocervical Instability: A Case Report
This case report describes the youngest documented patient with infantile calcifying pseudoneoplasm of the neuraxis (CAPNON) at the craniocervical junction, highlighting its atypical fluid-like gross appearance, aggressive presentation, and successful management through decompression and rigid immobilization without surgical fusion.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
The human brain and spinal cord are protected by a rigid, bony cage that runs from the base of the skull down the neck. This structure is vital, acting as a fortress that shields the body's most delicate wiring from injury. Sometimes, however, the body creates unusual growths within or near this protective cage. These are not cancers in the traditional sense, but rather strange, hard masses made of calcium and bone-like tissue that form in response to injury or inflammation. When these masses appear in the central nervous system, they are known as calcifying pseudoneoplasms of the neuraxis. While they are rare and usually grow very slowly in adults, doctors have long wondered how they behave in the bodies of infants, whose skeletons are still soft and rapidly changing. Understanding these growths is critical because if they form in the wrong place, they can squeeze the spinal cord, leading to severe breathing problems or paralysis.
A team of surgeons at Alder Hey Children's Hospital recently documented the youngest patient ever recorded with this condition, offering a surprising new look at how these lesions can behave in the very young. The patient was a boy born extremely prematurely at 27 weeks and 6 days of gestation. By the time he was eight months old, he was struggling with dangerous breathing pauses and difficulty swallowing, symptoms caused by a mass pressing on his spinal cord at the very top of his neck. Scans taken before surgery showed a dense, rock-hard buildup of calcium extending from the first to the third neck vertebrae. The images were so convincing that the medical team prepared for a difficult operation to drill away solid bone.
When the surgeons opened the area, however, they found something that defied the pictures on the scan. Instead of a solid, calcified rock, the lesion was a thick, opaque, bright-white fluid. It was a liquid mass that had completely dissolved the bony arches of the first two neck vertebrae, leaving the spine unstable. The surgeons performed a procedure to remove as much of this fluid as possible to relieve the pressure on the spinal cord, but they could not remove it all without causing further damage. The pathology report later confirmed that the fluid was indeed the rare condition known as a calcifying pseudoneoplasm of the neuraxis, characterized by a mix of calcified tissue and giant cells, but the fact that it existed as a liquid in an infant was a finding never before described in medical literature.
Because the child was so young and the surgery had removed the bony support that held his neck together, the team faced a difficult decision. Standard treatment for such instability often involves fusing the bones together with metal rods and screws, but this is a major procedure for an infant. Instead, the doctors chose to wait. They placed the child in a rigid neck brace and monitored him closely, allowing his own body to heal and reshape itself. Over the next fourteen months, the child's skeleton began to remodel. Follow-up scans showed that the remaining fluid mass had shrunk significantly, and the bony structures of the neck had reformed into a stable, normal shape without the need for metal implants or fusion surgery.
This case suggests that while these lesions can be aggressive and dangerous in infants, the human body's ability to rebuild itself at a young age is powerful. The doctors found that removing part of the mass was enough to stop the immediate danger, and that the child's own growth could eventually restore stability. It also highlights a critical lesson for surgeons: what looks like solid rock on a scan might be something entirely different when touched, especially in a baby. The team's work shows that careful observation and a willingness to let nature take its course can sometimes lead to better outcomes than immediate, invasive surgery. The boy remains under close watch, but the initial findings indicate that the body's natural capacity for repair can overcome even the most unusual of obstructions.
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