Osteopetrorickets: two contradictory patterns-one unifying diagnosis.

Area of Science:

• Pediatric Radiology
• Medical Genetics
• Skeletal Dysplasias

Background:

• Infants may present with confusing clinical signs, including paradoxical bone findings on X-ray.
• Leukemia is often suspected in infants with complex bone abnormalities and abnormal lab results.

Purpose of the Study:

• To report a case of autosomal recessive osteopetrosis with paradoxical radiographic findings.
• To highlight the diagnostic challenges and importance of recognizing specific radiographic patterns in infants.

Main Methods:

• Case presentation of a 5-month-old infant with contradictory bone findings (dense bones and rickets).
• Utilized next-generation gene panel sequencing to identify the genetic mutation.
• Reviewed clinical history, laboratory investigations, and radiographic evidence.

Main Results:

• Next-generation sequencing identified a TCIRG1 mutation, confirming autosomal recessive osteopetrosis.
• The patient exhibited paradoxical X-ray findings of both bone densification and rickets.
• This presentation underscores a newly understood pathogenic mechanism for TCIRG1 mutations.

Conclusions:

• Recognizing the association between TCIRG1 mutations and paradoxical radiographic findings is critical for accurate diagnosis.
• Early identification of autosomal recessive osteopetrosis prevents diagnostic delays and potential irreversible organ damage.
• This case emphasizes the integration of genetic sequencing with clinical and radiographic data in complex pediatric cases.