TROPHOZOITE
SIZE: 2 to 4 mcm.
SHAPE: Irregular.
CONTENTS: Central nucleus.
IMMATURE CYST
SIZE: 5 to 12 mcm.
SHAPE: Spherical, often collapsed.
MATURE CYST
SIZE: 5 to 12 mcm.
SHAPE: Spherical.
CONTENTS: 8 nuclei, often in "rosette" arrangement.
Figure 2-16. Stages of P. carinii.
MD0842
2-17