The anal canal is the terminal part of the large intestine. In humans it is approximately 2. It lies in the anal triangle of perineum in...
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The anal canal is the final segment of the gastrointestinal tract, that has an important role in defecation and maintaining faecal continence. The anal canal is located within the anal triangle of the perineum between the right and left ischioanal fossae.
The anatomy, pathology, and imaging of anal and rectal cancers are discussed, with special emphasis on distinguishing factors that affect use of radiation therapy for these conditions. Although rectal and anal cancers are anatomically close, they are distinct entities with different histologic features, risk factors, staging systems, and treatment pathways. Imaging is at the core of initial clinical staging of these cancers and most commonly includes magnetic resonance imaging for local-regional staging and computed tomography for evaluation of metastatic disease.❿
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