Transbronchial biopsies were performed in the left upper lobe posterior
subsegment, along with BAL. No pathogen was cultured in the BAL fluid.
In addition, DNA analysis for mycobacteria was negative. The BAL count
revealed 78.4 × 103 cells/μL with 17.9%
macrophages, 39.8% lymphocytes, 38.8% neutrophils, and 3.4%
eosinophils. Immunocytometry of BAL cells showed a normal
CD4+/CD8+ ratio of 1.9, an
increased number of total γ/δ-T lymphocytes with a dominance of
Vδ2 cells, and a moderately elevated number of both
CD25+ and VLA-1+
lymphocytes, while other CD4+ subtypes
CD45RA+, CD45R0+) were
within the normal range. Transbronchial lung biopsies revealed
inflammatory alveolar lesions suggestive of BOOP.