Fecal material

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Fecal material
Diagnosis in short

LM plant matter - has cell walls, meat - skeletal muscle without nuclei, no colorectal mucosa, microorganisms (bacilli, cocci)
LM DDx necrosis
Gross soft material, amorphous, friable
Site cecum, colon, rectum

Clinical history poor bowel preparation
Clin. DDx gastrointestinal polyp

Fecal material, also fecal matter, is poo. It is seen in gastrointestinal pathology.

General

  • Common.
  • Associated with poor bowel preparation.
    • People on a low-fibre diet seem to have less of 'em.[1]
  • Endoscopists go after anything that is polypoid and that may be nothing more than poo.

Gross

  • Soft amorphous material.
  • +/-Friable.

Microscopic

Features:

  • Plant material:
    • Yellow staining chicken wire-like material - may be linear.
      • Thick cell walls often without cytoplasm and usually without a nucleus.
  • Meat:
    • Eosinophilic honeycomb-like material without nuclei and without inflammation.
      • Essentially ischemic skeletal muscle without inflammation.
  • +/-Microorganisms.
  • +/-Inflammatory cells.

DDx:

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TRANSVERSE COLON, BIOPSY:
- FECAL MATERIAL.
- NO DEFINITE COLONIC MUCOSA IDENTIFIED.

Alternate

ASCENDING COLON ("POLYP"), BIOPSY:
- CONSISTENT WITH PARTIALLY DIGESTED FOOD.
- NO DEFINITE COLONIC MUCOSA IDENTIFIED.

Micro

The sections show a fragment of striated muscle without nuclei and without inflammation, intermixed with scant microorganisms. No colorectal mucosa is identified.

Rectum

RECTUM, BIOPSY:
- FECAL MATERIAL.
- NO DEFINITE RECTAL MUCOSA IDENTIFIED.

References

  1. Liedenbaum, MH.; Denters, MJ.; de Vries, AH.; van Ravesteijn, VF.; Bipat, S.; Vos, FM.; Dekker, E.; Stoker, J. (Jul 2010). "Low-fiber diet in limited bowel preparation for CT colonography: Influence on image quality and patient acceptance.". AJR Am J Roentgenol 195 (1): W31-7. doi:10.2214/AJR.09.3572. PMID 20566777.

See also