Overview
Kenny-Caffey syndrome is characterized by severe growth retardation, skeletal abnormalities including cortical thickening and medullary stenosis of tubular bones, hypocalcemia, and other systemic manifestations such as eye abnormalities and facial dysmorphism. It is often associated with haploinsufficiency on chromosome 22q11.2, part of the CATCH 22 syndrome spectrum 12.Diagnosis
Clinical Features: Severe pre- and postnatal growth retardation, cortical thickening of tubular bones with medullary stenosis, hypocalcemia, eye abnormalities, facial dysmorphism 12.
Biochemical Tests: Low levels of parathyroid hormone and hypocalcemia 1.
Imaging: Radiological findings of cortical thickening and medullary stenosis of tubular bones, poorly ossified skull bones 12.
Genetic Testing: Fluorescence in situ hybridization (FISH) using probes specific to the 22q11.2 region to identify haploinsufficiency 1.Management
Calcium and Vitamin D Supplementation: To manage hypocalcemia; specific dosing not detailed 12.
Parathyroid Hormone Therapy: Consideration for severe hypoparathyroidism, though specific dosing is not provided 1.
Supportive Care: Management of complications such as seizures and infections, including monitoring immune function 12.Special Populations
Pediatrics: Neonatal and early childhood management focuses on growth support, calcium homeostasis, and addressing developmental delays 12.
Comorbidities: Increased susceptibility to infections due to impaired neutrophil phagocytosis and immune dysregulation requires vigilant monitoring and supportive care 1.Key Recommendations
Perform genetic testing via FISH for 22q11.2 haploinsufficiency in patients with clinical features suggestive of Kenny-Caffey syndrome to confirm diagnosis (Evidence: Moderate 1).
Initiate calcium and vitamin D supplementation to manage hypocalcemia, tailored to individual patient needs (Evidence: Expert opinion 12).
Closely monitor and manage immune function and susceptibility to infections in affected pediatric patients (Evidence: Moderate 1).References
1 Sabry MA, Zaki M, Abul Hassan SJ, Ramadan DG, Abdel Rasool MA, al Awadi SA et al.. Kenny-Caffey syndrome is part of the CATCH 22 haploinsufficiency cluster. Journal of medical genetics 1998. link
2 Franceschini P, Testa A, Bogetti G, Girardo E, Guala A, Lopez-Bell G et al.. Kenny-Caffey syndrome in two sibs born to consanguineous parents: evidence for an autosomal recessive variant. American journal of medical genetics 1992. link