Appendiceal Mucinous Tumor Presenting as Recurrent Bowel Obstruction

Area of Science:

• Gastroenterology
• Surgical Oncology
• Radiology

Background:

• Appendiceal mucinous tumors are uncommon, with variable malignant potential, often discovered incidentally.
• Clinical presentations are typically nonspecific, complicating early diagnosis.
• Appendiceal neoplasms rarely manifest as bowel obstruction, posing diagnostic challenges.

Purpose of the Study:

• To report a rare case of small bowel obstruction caused by direct invasion from an appendiceal mucinous tumor.
• To emphasize the diagnostic difficulties and the importance of thorough imaging review in such cases.

Main Methods:

• Case presentation of an 84-year-old female with recurrent small bowel obstruction.
• Review of initial computed tomography (CT) scans and surgical findings.
• Analysis of the appendiceal tumor's adherence to and invasion of the adjacent ileum.

Main Results:

• Initial diagnosis of ileus due to adhesion band, with temporary improvement.
• Recurrent obstruction necessitating surgery, revealing an appendiceal tumor invading the ileum.
• CT scan misinterpretation of the appendiceal tumor as a small bowel loop due to lack of inflammatory signs.

Conclusions:

• Appendiceal tumors can directly cause bowel obstruction through invasion, mimicking other common causes.
• Careful radiological evaluation is crucial for accurate diagnosis of small bowel obstruction, especially in atypical presentations.
• Increased awareness of appendiceal tumors as a cause of bowel obstruction is essential for timely and appropriate management.