Figure 3.

Cytological and histological findings in sarcoidosis

a) transbronchial lung biopsy specimen, with non-caseating granulomas containing epthelioid and giant cells

b) a granuloma obtained by ultrasound-guided needle biopsy of a mediastinal lymph node

c) cell smear of a bronchoalveolar lavage (BAL) specimen, showing the typical abundance of CD4⁺ T lymphocytes (small, round cells with a large nucleus and little cytoplasm). Most of the other cells are alveolar macrophages with a large amount of cytoplasm.