Tumors of the appendix and colon

Area of Science:

• Gastroenterology
• Surgical Pathology
• Oncology

Background:

• Smooth muscle tumors of the appendix and large intestine are rare.
• Comprehensive data on these tumors, including benign leiomyomas (LMs) and malignant leiomyosarcomas (LMSs), are limited.
• A review of global literature is needed to consolidate existing knowledge.

Purpose of the Study:

• To conduct a collective review of all reported cases of smooth muscle tumors of the appendix and large intestine.
• To analyze cumulative and recent data on both benign and malignant smooth muscle tumors from 1875 to 1996.
• To characterize the epidemiology, clinical presentation, and pathological features of these tumors.

Main Methods:

• Systematic literature search for case reports of smooth muscle tumors in the appendix and large intestine.
• Inclusion of all available case reports from 1875 to 1996.
• Data extraction and analysis of tumor incidence, demographics, location, growth patterns, symptoms, and metastasis.

Main Results:

• A total of 331 leiomyomas (LMs) and 263 leiomyosarcomas (LMSs) were reported.
• Peak incidence for LMs was ages 30-39; for LMSs, ages 50-59.
• Descending and sigmoid colon were most common sites; LMs grew extraluminally, LMSs intraluminally.
• Pain was the most frequent symptom for both; LMSs were larger and metastasized more frequently.

Conclusions:

• Smooth muscle tumors of the large intestine exhibit distinct demographic and clinical characteristics.
• Leiomyosarcomas present a greater diagnostic and therapeutic challenge due to their size, intraluminal growth, and metastatic potential.
• Further research into the pathogenesis and management of these rare tumors is warranted.