Osteopetrorickets Presenting with Failure to Thrive and Hypophosphatemia

Area of Science:

• Pediatric Endocrinology
• Genetics
• Skeletal Dysplasias

Background:

• Osteopetrosis is a rare genetic bone disorder.
• Characterized by impaired osteoclast function and high bone density.
• Osteopetrorickets results from defective bone resorption and mineralization.

Observation:

• A rare infantile osteopetrorickets case is presented.
• An 8-week-old female exhibited failure to thrive, hypophosphatemia, anemia, and thrombocytopenia.
• Skeletal survey revealed increased bone density and rachitic changes.

Findings:

• A homozygous pathogenic mutation in the T-cell immune regulator 1 (TCIRG1) gene was identified.
• This genetic finding confirmed the diagnosis of osteopetrosis.
• The constellation of symptoms points to a specific genetic cause.

Implications:

• Highlights the importance of considering osteopetrosis in infants with failure to thrive and cytopenias.
• Emphasizes the role of genetic testing (TCIRG1) in diagnosing rare skeletal disorders.
• Underscores the complex presentation of osteopetrorickets, requiring a high index of clinical suspicion.