Learning Radiology xray montage

Lipoma of the Cecum


  • Uncommon tumors, but second in prevalence to adenomas for colonic tumors
  • Tend to occur more frequently in older females
  • Usually asymptomatic
  • When symptomatic, can produce:
    • Pain
    • Diarrhea
    • Rectal bleeding-if surface ulcerates
    • Constipation
  • Almost all are submucosal
  • Most are located on the right side (40%), but about 20% are in the sigmoid
    • In the small bowel, lipomas are more common proximally (duodenum)

  • Imaging findings

    • Usually less than 4 cm in size
    • Smooth, sharply defined hemispheric mass
    • Typically produces either right-angle or slightly obtuse angle as the lesion meets lumen of bowel
    • Rarely pedunculated
    • Squeeze-sign = deformity due to softness and compressibility of these lesions
      • Contour may be altered by peristalsis
    • Ulceration is rare
    • CT may demonstrate fatty nature of lesion, especially if they are large enough for accurate density measurements
  • May intussuscept
  • Do not undergo malignant transformation 

 cecal lipoma

Cecal Lipoma. Axial CT image of right lower quadrant shows a large, lobulated filling defect in the cecum with well-circumscribed margins. The lower image demonstrates a negative Hounsfield values (-85HU)
consistent with fat. The lesion represents a lipoma of the cecum.