Hobnail cells

What are Hobnail cells ?

Hobnailing is seen in

  1. Clear cell ovarian adenocarcinoma,
  2. Papillary thyroid carcinoma
  3. Collecting duct carcinoma
  4. End-stage cirrhosis

Papillary thyroid carcinoma

  • Characterized by predominance of cells with a hobnail appearance often arranged in micropapillary pattern
  • Aggressive variant

Clear cell ovarian adenocarcinoma

  • Mesonephroid primary ovarian adenocarcinoma – clear cell
  • Clear cell (mesonephroid) tumors contain cells with abundant glycogen
  • Most common cell types in clear cell carcinomas of the ovary are clear cells and hobnail cells

Hobnail cells

Histopathology of ovarian serous borderline tumor with hobnailing
ovarian serous borderline tumor – whose epithelium displays hobnailing

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