From White Count to White Out

Area of Science:

• Pediatrics
• Infectious Diseases
• Immunology

Background:

• Failure to thrive and hypoxia in infants can indicate serious underlying conditions.
• Pneumocystis jirovecii pneumonia is an uncommon but severe infection in infants.
• Hyper immunoglobulin M syndrome is a rare primary immunodeficiency.

Purpose of the Study:

• To report a case of Pneumocystis jirovecii pneumonia in an infant with hyper immunoglobulin M syndrome.
• To emphasize the importance of considering rare causes of hypoxia in pediatric emergency medicine.

Main Methods:

• Case report of a 6-month-old boy presenting with failure to thrive, leukocytosis, hypoxia, and diffuse pulmonary infiltrates.
• Diagnostic workup included chest radiography and identification of Pneumocystis jirovecii.
• Underlying diagnosis of hyper immunoglobulin M syndrome was established.

Main Results:

• The patient was diagnosed with Pneumocystis jirovecii pneumonia.
• The pneumonia was secondary to hyper immunoglobulin M syndrome.
• The infant presented with significant hypoxia and diffuse infiltrates on chest radiograph.

Conclusions:

• Pneumocystis jirovecii pneumonia, though rare, is a critical consideration in hypoxic infants.
• Hyper immunoglobulin M syndrome should be considered in infants with recurrent or severe infections.
• Pediatric emergency physicians must maintain awareness of life-threatening, uncommon causes of hypoxia in infants.