The-definition.com

Definition

Cancer of the Rectum

Cancer (carcinoma) of the rectum is a common clinical finding that remains localized to the rectal wall for a considerable time. At first, it tends to spread locally in the lymphatics around the circumference of the bowel. Later, it spreads upward and laterally along the lymph vessels, following the superior rectal and middle rectal arteries. Venous spread occurs late, and because the superior rectal vein is a tributary of the portal vein, the liver is a common site for secondary deposits.

Once the malignant tumor has extended beyond the confines of the rectal wall, knowledge of the anatomic relations of the rectum will enable a physician to assess the structures and organs likely to be involved. In both sexes, a posterior penetration involves the sacral plexus and can cause severe intractable pain down the leg in the distribution of the sciatic nerve. A lateral penetration may involve the ureter. An anterior penetration in the male may involve the prostate, seminal vesicles, or bladder; in the female, the vagina and uterus may be invaded.

References
Share it:  Cite

More from this Section

  • Mental Health Services
    Mental Health Services is the diagnostic, treatment and preventive services that help ...
  • Large Intestine
    The large intestine arches around and encloses the coils of the small intestine and tends ...
  • Pleura
    Each lung is surrounded by a separate pleural (relating to the ribs) cavity formed by ...
  • Bronchopulmonary Segments
    The bronchopulmonary segments are the anatomic, functional, and surgical units of the ...
  • Calcification
    Calcification is the process in which organic tissue becomes hardened by the deposition ...