★ Centroblasts (濾胞中心芽細胞): 大型で，類円形核，水疱状クロマチン，核膜寄りに存在する1〜3個の核小体，狭い細胞質を持つ。典型的には小型リンパ球の3倍の大きさであるがより小さい 場合もある。
 Large cells with usually round or oval, but occasionally indented or multilobated nuclei, vesicular chromatin, one to three peripheral nucleoli and a narrow rim of cytoplasm. Typically, they are at least 3 times the size of lymphocytes, but they may be smaller in some cases.

★ Centrocytes (濾胞中心細胞): 小型から中型の細胞でくびれがある核，目立たない核小体，狭い淡明な細胞質を持つ。
Small to medium sized cells with angulated, elongated, twisted or cleaved nuclei, inconspicuous nucleoli and scant pale cytoplasm.

★ Follicular dendritic cells (濾胞樹上細胞): 繊細な核膜，均一なクロマチン，中心性の赤い核小体，ときに二核を持つ。
delicate nuclear membrane, dispersed chromatin, violet-coloured centrally located nucleoli, often binucleate

☆ Centroblasts: Medium-sized or large cels with a round or oval, pale nucleus containing 2-3 nucleoli, usually located at the nuclear membrane; cytoplasm is sparse and intensely basophilic (Lennert, 1957, 1961).
☆ Centrocytes: Small or medium-sized cells with a cleaved or irregularly shaped nucleus; cytoplasm is usually sparse and very weakly basophilic and thus difficult to recognize in sections (Lennert,1964).
Except in newly formed germinal centres, centrocytes are the predominant cells.

視 野数22の場合，7視野を数え，10で割った数で判定(WHO 分類)

Grade 1-2 (low grade): 0〜15 centroblasts/hpf G1, 0-5; G2, 6-15
Grade 3A > 15 centroblasts/hpf, centrocytes present
Grade 3B Solid sheets of centroblasts

Follicular lymphoma,
    Follicular (>75% follicular)
    Follicular and diffuse (25〜75% follicular)
    Focally follicular (<25% follicular)
    Diffuse 0% follicular