Idiopathic CD4 Lymphocytopenia.

Area of Science:

• Immunology
• Infectious Diseases
• Hematology

Background:

• Idiopathic CD4 lymphocytopenia (ICL) is a rare condition characterized by low CD4+ T-cell counts in the absence of HIV infection.
• ICL is associated with an increased risk of opportunistic infections and certain malignancies.
• The etiology and pathogenesis of ICL remain largely unknown.

Observation:

• A 42-year-old male presented with symptoms suggestive of disseminated infection.
• Investigations revealed low CD4+ T-cell counts on two separate occasions, meeting criteria for ICL.
• The patient was also diagnosed with extrapulmonary tuberculosis and diffuse splenic calcification.

Findings:

• The patient's low CD4 counts persisted despite the absence of HIV infection.
• Extrapulmonary tuberculosis was identified as a significant comorbidity.
• Diffuse splenic calcification was noted incidentally on imaging.

Implications:

• This case underscores the importance of considering ICL in non-HIV individuals presenting with severe infections.
• Antitubercular treatment led to clinical improvement, suggesting a potential link between tuberculosis and ICL in this patient.
• Further research is needed to elucidate the complex interplay between ICL, infections, and splenic abnormalities.