Kenny Caffey Syndrome Type 2: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Kenny Caffey Syndrome Type 2?
A primary care doctor usually manages day-to-day care and orders routine tests. People with this condition also see specialists: an endocrinologist treats hormone and calcium problems, a geneticist studies inherited conditions, an eye doctor checks vision, and an orthopedic doctor treats bone problems. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What it is
Kenny Caffey Syndrome Type 2 is a rare condition that a person is born with. It affects how bones grow and how the body handles calcium, a mineral that bones and nerves need to work well. People with this condition often have short height, thick bones with a narrow center, and low levels of calcium in their blood.
Symptoms
The signs usually show up before birth or in early childhood. Most people with the condition are shorter than average, and this small size is present from birth. The outer layer of the long bones is thicker than normal, and the hollow space inside is narrow. Low calcium can cause muscle cramps, twitching, or seizures. Some people also have small eyes and trouble seeing things up close or far away.
Causes and who gets it
Kenny Caffey Syndrome Type 2 is caused by changes in a gene called FAM111A. It is inherited in an autosomal dominant pattern, which means one changed copy of the gene is enough to cause the condition. In many families the change is new in the child and was not passed down from a parent. A different type, type 1, is caused by the TBCE gene and needs a changed copy from both parents.
How doctors diagnose it
Doctors look at a person's growth, symptoms, and blood tests that show low calcium levels. X-rays can reveal the thick outer layer and narrow center of the bones that are typical of the condition. Genetic testing can confirm the diagnosis by finding changes in the FAM111A gene.
Treatment
There is no cure, but treatment can manage the symptoms. Calcium and vitamin D medicines help keep blood calcium at a safe level. Doctors also monitor growth, bone health, eyes, and blood calcium with regular checkups, and they treat problems such as seizures if they happen.
When to see a doctor
A parent should talk to a doctor if a baby or child is much smaller than expected, has muscle cramps or twitching, or has seizures. Seizures always need medical attention right away. Adults diagnosed as children should keep regular follow-up care, because blood calcium can change over time.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance for visits. This kind of doctor can handle routine care, including ordering blood tests, prescribing calcium and vitamin D medicines, and watching growth and bone health. Because this condition is rare and complex, a direct primary care or concierge doctor would usually refer the patient to an endocrinologist and a geneticist while continuing to manage everyday care.
Common questions
Is Kenny Caffey Syndrome Type 2 life threatening?
Low calcium can cause serious problems such as seizures if it is not treated, so regular medical care matters. With steady treatment, many people live into adulthood, though experiences vary from person to person.
Will a child with this condition grow to normal height?
Most people with the condition are shorter than average, and the small size starts before birth. Doctors can discuss expected growth patterns based on the individual child.
Can it be passed to my children?
The condition is inherited in an autosomal dominant pattern, so a person with it has a 50 percent chance of passing the changed gene to each child. In many families the change is new in the child and was not inherited. A genetic counselor can help families understand their specific risks.
Is there a cure?
There is no cure, but treatments such as calcium and vitamin D can manage low blood calcium and other problems. How well someone does depends on the person and the care they receive.
Sources
- NORD - Kenny-Caffey Syndrome
- National Library of Medicine, PubMed Central - Kenny-Caffey Syndrome Type 2 (KCS2): A New Case Report and Patient Follow-Up Optimization
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
