Granulation tissue

Granulation tissue forms when wound heal.

Gross

• Looks granular, ergo the name granulation tissue.

Image

• 

  Granulation. (WC)

Microscopic

Features:

• Blood vessel rich - key element.
  • Small size ~ 25 micrometers in diameter.^{[citation needed]}
• Proliferation of fibroblasts - key element.
• Inflammation - especially lymphocytes.
  • Plasma cells common.

DDx:

• Mucocele.
• Pyogenic granuloma.
• Traumatized hemangioma.

Images:

• Granulation tissue with entrapped muscle (jhmi.edu).
• Granulation tissue (siumed.edu).

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URINARY BLADDER, BIOPSY:
- REGENERATIVE EPITHELIUM, INFLAMED SUBEPITHELIAL TISSUE AND GRANULATION TISSUE.
- NO MUSCULARIS PROPRIA.
- NEGATIVE FOR MALIGNANCY.

Micro

The sections show vascular tissue with plump fibroblasts, reactive endothelial cells and a mixed inflammatory infiltrate (granulation tissue). Focally, a dense cluster of neutrophils is seen at the luminal aspect.

A single layer of epithelium with pale, plump nuclei is present without apparent mitotic activity. Inflamed subepithelial tissue is present. No stratified urothelium is identified. No significant nuclear atypia is present.

See also

• Basics.