Coned Cecum

A cone-shaped cecum refers to a narrowed and thick-walled cecum. Differential considerations include:

• Tuberculosis: Terminal ileum can be involved.
• Crohn disease: Terminal ileum is involved.
• Amebiasis: Terminal ileum is not involved. Can cause ulcerations with skip lesions.
  
  
• Ulcerative colitis: Dilated terminal ileum (backwash ileitis)
• Typhlitis
• Lymphoma
• Cecal carcinoma
• Radiation therapy
• Metastases

References

• Silva AC, Beaty SD, Hara AK, Fletcher JG, Fidler JL, Menias CO, Johnson CD. Spectrum of normal and abnormal CT appearances of the ileocecal valve and cecum with endoscopic and surgical correlation. Radiographics. 2007 Jul-Aug;27(4):1039-54.
• Thoeni RF, Cello JP. CT imaging of colitis. Radiology. 2006 Sep;240(3):623-38