[Variation in morphology or two entities?]

Area of Science:

• Oncology
• Gastroenterology
• Pathology

Background:

• A 37-year-old patient presented with constitutional symptoms (B symptoms).
• Initial investigations revealed widespread metastatic disease, including liver lesions, enlarged lymph nodes, and splenic and pulmonary foci.

Observation:

• Biopsies confirmed adenocarcinoma of the colon originating from a cecal tumor.
• The patient's molecular pathology profile showed microsatellite instability.
• Post-neoadjuvant treatment, the surgical specimen exhibited atypical morphological features.

Findings:

• The primary diagnosis was metastatic colon adenocarcinoma with microsatellite instability.
• The unusual morphology of the post-surgical specimen prompted further investigation.

Implications:

• This case highlights the importance of thorough histopathological evaluation in complex oncological presentations.
• The findings underscore the need to consider differential diagnoses, such as a second primary tumor, even in the presence of known metastatic disease.
• Further investigation is warranted to clarify the nature of the unusual morphology and its clinical significance.