Leukocyte adhesion defect type 1 presenting with recurrent pyoderma gangrenosum.

Area of Science:

• Immunology
• Genetics
• Dermatology

Background:

• Leukocyte adhesion deficiency type 1 (LAD1) is a rare autosomal recessive disorder affecting leukocyte function, leading to recurrent infections.
• Patients exhibit neutrophilia but impaired inflammatory responses due to deficient β2-integrin expression.
• Skin manifestations can include chronic, slow-healing ulcers, often requiring extensive treatment.

Purpose of the Study:

• To present a case of a pediatric patient diagnosed with LAD1.
• To highlight the association between LAD1 and pyoderma gangrenosum (PG).
• To discuss the clinical course and outcome of the diagnosed patient.

Main Methods:

• Diagnosis of LAD1 was established using flow cytometry to measure surface CD11b expression on neutrophils.
• Clinical presentation and patient history were documented.
• Treatment response, including high-dose prednisone, was monitored.

Main Results:

• A 5-year-old female with a history of PG was diagnosed with LAD1.
• The patient initially responded to high-dose prednisone therapy.
• Despite treatment, the patient developed severe pneumonia, pneumothorax, pneumomediastinum, and ultimately succumbed to the illness.

Conclusions:

• LAD1 can present with atypical dermatological manifestations such as pyoderma gangrenosum.
• Early diagnosis and management of LAD1 are crucial, although severe complications can still occur.
• This case underscores the critical role of leukocyte adhesion molecules in immune defense and the severe consequences of their deficiency.