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protozoan cyst

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SHAPE: ROUND TO SPHERICAL NUCLEI: 1-8 KARYOSOME: large, irregular, and eccentric PERIPHERAL CHROMATIN: unevenly distributed CYTOPLASM: coarse and granulated CYTOPLASMIC INCLUSIONS *OTHER INFOS: THIN CHROMATOID BARS WITH POINTED SPLINTERED ENDS

Entamoeba COLI

SHAPE: SPHERICAL NUCLEI: 1-4 KARYOSOME: small and central PERIPHERAL CHROMATIN: fine and evenly distributed CYTOPLASM: finely granulate CYTOPLASMIC INCLUSIONS *OTHER INFOS: chromatoid bars, rounded ends in young cysts

Entamoeba HARTMANNI

SHAPE: SPHERICAL/ OVOID ELLIPSOID NUCLEI: 1-4 USUALLY 4 KARYOSOME: large, irregular, and blotlike PERIPHERAL CHROMATIN: absent CYTOPLASM: granular and vacuolated CYTOPLASMIC INCLUSIONS *OTHER INFOS: nondescript small mass

ENDOLIMAX NANA

SHAPE: SPHERICAL OR OVAL NUCLEI: 1 KARYOSOME: small and central PERIPHERAL CHROMATIN: fine and evenly distributed CYTOPLASM: granular and vacuolated CYTOPLASMIC INCLUSIONS *OTHER INFOS: angular chromatoid bards or pointed ends in young cysts

Entamoeba POLECKI

SHAPE: SPHERICAL TO ROUND NUCLEI: 1-4 KARYOSOME: small and central PERIPHERAL CHROMATIN: fine and evenly distributed CYTOPLASM: finely granulate CYTOPLASMIC INCLUSIONS *OTHER INFOS: chromatoid bars, rounded ends in young cysts

Entamoeba HISTOLYTICA

SHAPE: ROUND AND THICK CELL WALLS NUCLEI: 1 KARYOSOME: large and usually centrally located PERIPHERAL CHROMATIN: absent CYTOPLASM: granular and usually vacuolated CYTOPLASMIC INCLUSIONS *OTHER INFOS: often contains vacuoles

NAEGLERIA FOWLERI

SHAPE: x NUCLEI: x KARYOSOME: x PERIPHERAL CHROMATIN: x CYTOPLASM: x CYTOPLASMIC INCLUSIONS *OTHER INFOS: no one cyst form of the parasite

Entamoeba GINGIVALIS

SHAPE: ROUNDISH WITH RAGGED EDGES NUCLEI: 1 KARYOSOME: large PERIPHERAL CHROMATIN: granular and vacuolated CYTOPLASM: granular and usually vacuolated CYTOPLASMIC INCLUSIONS *OTHER INFOS: double cell wall

ACANTHAMOEBA SPP

SHAPE: OVOID, ELLIPSOID, TRIANGULAR, OTHERS NUCLEI: 1 KARYOSOME: large, usually central refractive acromatic granules may/not be present PERIPHERAL CHROMATIN: absent CYTOPLASM: coarsely granular and vacuolated CYTOPLASMIC INCLUSIONS *OTHER INFOS: well defined glycogen mass

IODAMOEBA BUSTCHLII

Study Notes

Shape and Nuclei

  • Round to spherical shape with 1-8 nuclei
  • Spherical shape with 1-4 nuclei, small and central karyosome
  • Spherical/ovoid ellipsoid shape with 1-4 nuclei, usually 4, large and irregular karyosome
  • Spherical or oval shape with 1 nucleus, small and central karyosome
  • Spherical to round shape with 1-4 nuclei, small and central karyosome
  • Round and thick cell walls with 1 nucleus, large and centrally located karyosome
  • x shape with x nuclei, no specific karyosome description
  • Roundish with ragged edges shape with 1 nucleus, large karyosome
  • Ovoid, ellipsoid, triangular, and other shapes with 1 nucleus, large and usually central karyosome

Karyosome

  • Large, irregular, and eccentric karyosome
  • Small and central karyosome
  • Large, irregular, and blotlike karyosome
  • Small and central karyosome
  • Large and usually centrally located karyosome
  • No specific karyosome description
  • Large karyosome
  • Large, usually central refractive acromatic granules may or may not be present

Peripheral Chromatin

  • Unevenly distributed peripheral chromatin
  • Fine and evenly distributed peripheral chromatin
  • Absent peripheral chromatin
  • Fine and evenly distributed peripheral chromatin
  • Absent peripheral chromatin
  • Granular and vacuolated peripheral chromatin
  • Absent peripheral chromatin

Cytoplasm

  • Coarse and granulated cytoplasm
  • Finely granulated cytoplasm
  • Granular and vacuolated cytoplasm
  • Granular and usually vacuolated cytoplasm
  • Finely granulated cytoplasm
  • Granular and usually vacuolated cytoplasm
  • Coarsely granular and vacuolated cytoplasm

Cytoplasmic Inclusions

  • Thin chromatoid bars with pointed splintered ends
  • Chromatoid bars with rounded ends in young cysts
  • Nondescript small mass
  • Angular chromatoid bars or pointed ends in young cysts
  • Chromatoid bars, rounded ends in young cysts
  • Often contains vacuoles
  • No specific cytoplasmic inclusions
  • Double cell wall
  • Well-defined glycogen mass

Identify the characteristics of cysts, including their shape, nuclei, karyosome, peripheral chromatin, and cytoplasm. Learn about the features of cysts and their variations. Test your knowledge of cyst morphology.

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