Conditions/Appendicitis/Chapter
Appendicitis — Appendiceal Tumors
Rare but changes the plan
Appendiceal tumors are uncommon and often found incidentally after appendectomy for presumed appendicitis. Some block the lumen and mimic appendicitis. Type, size, and spread determine whether further colectomy, surveillance, or oncology care is needed.
Key points
- Neuroendocrine tumor (NET)Tap for details
Most common appendiceal tumor; often tip-located. Small low-grade lesions may need appendectomy alone; size, site, and grade guide further surgery.
- Mucinous neoplasmsTap for details · key note inside
Low-grade appendiceal mucinous neoplasm differs from high-grade disease. Peritoneal mucin spread (pseudomyxoma) is a critical concern.
- AdenocarcinomaTap for details · key note inside
Colon-type cancer principles apply—often right hemicolectomy ± staging and systemic therapy.
- Clinical clueTap for details
Chronic atypical right-lower symptoms or imaging suggesting mucin or mass should raise tumor suspicion—even though most diagnoses are pathologic.
More chapters in this hub
Appendicitis Symptoms
What patients notice — and which warning signs need urgent care
Causes of Appendicitis
Lumen blockage, fecalith, and rare tumors
Appendicitis Diagnosis
Exam, ultrasound, CT, and labs
Laparoscopic Appendectomy
Laparoscopic surgery: what the procedure aims to do and who it fits
Appendicitis Complications
Patient education on complications in appendicitis
Appendicitis Treatment
Appendectomy and alternatives
Why Pathology Matters
Every appendix is examined
Appointment / info
This page is for education. It is not medical advice and does not replace a visit with your physician.
Medical editor: Assoc. Prof. Cengiz Dibekoğlu, MD · Last medically reviewed: August 2026 · English patient-education chapter.