Neoplastic colonic polyp with extensive squamous metaplasia. Case report

Area of Science:

• Gastroenterology
• Oncology
• Pathology

Background:

• Squamous metaplasia in colonic polyps is an uncommon phenomenon.
• The genesis of squamous cell carcinoma and adenocanthoma of the colon remains unclear.
• Understanding metaplastic changes in the colon is crucial for diagnosing and managing neoplastic lesions.

Observation:

• This report details a rare case of extensive squamous metaplasia within an adenomatous colonic polyp.
• The metaplasia was observed to evolve through stages of dysplasia, in situ adenocarcinoma, and invasive adenocarcinoma.
• This represents the sole documented instance illustrating the progression of squamous metaplasia in colonic glands leading to adenocarcinoma.

Findings:

• The study documents the sequential development of squamous metaplasia in a colonic adenomatous polyp.
• Evidence suggests a direct progression from metaplastic changes in dysplastic glands to invasive adenocarcinoma.
• This case provides a unique histological continuum of neoplastic evolution.

Implications:

• This case offers valuable insights into the pathogenesis of squamous differentiation in colorectal adenocarcinoma.
• It highlights the importance of recognizing squamous metaplasia in colonic polyps for accurate diagnosis.
• Further research into metaplastic pathways may improve understanding and treatment of rare colorectal cancers.