Fig. 2
From: Histiocytic pleural effusion: the strong clue to malignancy
Microscopic image of white blood cells in pleural fluid (Wright-Giemsa stain, ×400). Histiocytes (a) appear as described in Fig. 1. Neutrophils (b) are 12–14 μm in diameter and appear larger than the surrounding RBCs. They have a single nucleus, which contains 2–5 lobes, and their cytoplasm has many granules. Lymphocytes (c) are small (approximately 6–9 μm) and have a spherical nucleus. The cytoplasm is small and basophilic