Pseudo-Synchronous Colorectal Cancer: A Case Report

Area of Science:

• Oncology
• Gastroenterology

Background:

• Colorectal cancer is a prevalent malignancy with varying metastatic patterns based on tumor location and histology.
• Sporadic colorectal cancer, a somatic genetic disease, is influenced by both the colonic environment and host genetics.
• Synchronous colorectal cancers are diagnosed concurrently or within six months post-operation.

Observation:

• A patient presented with colon cancer and obstructive symptoms, revealing a primary lesion in the cecum.
• A secondary lesion was identified in the rectum, below normal mucosa, distinct from the primary cecal tumor.
• This metastatic pattern from cecum to rectum is unprecedented in current medical literature.

Findings:

• The rectal lesion, found below normal mucosa, was classified as metastatic from the primary cecal cancer.
• The term "pseudo-synchronous" was adopted to describe this rare metastatic presentation.
• This case highlights an unusual metastatic pathway for colorectal cancer.

Implications:

• This case expands the understanding of colorectal cancer's metastatic potential and behavior.
• Further research is warranted to elucidate the mechanisms behind this rare metastatic pattern.
• Clinical vigilance for unusual metastatic sites in colorectal cancer is crucial.