Differential Diagnosis for Rectal Wall Thickening near Anorectal Junction
Single Most Likely Diagnosis
- Proctitis: This is the most likely diagnosis due to the location of the rectal wall thickening near the anorectal junction and the presence of minimal periectal fat stranding. Proctitis can be caused by inflammatory bowel disease (IBD), infection, or radiation.
Other Likely Diagnoses
- Rectal Cancer: Although less likely than proctitis, rectal cancer can cause rectal wall thickening and should be considered, especially if there are other symptoms such as weight loss, bleeding, or a change in bowel habits.
- Inflammatory Bowel Disease (IBD): Conditions like ulcerative colitis or Crohn's disease can cause rectal wall thickening, especially near the anorectal junction.
- Anal Fistula or Abscess: These conditions can cause rectal wall thickening and periectal fat stranding, although they are typically associated with more significant symptoms such as pain and discharge.
Do Not Miss Diagnoses
- Rectal Lymphoma: Although rare, rectal lymphoma can cause rectal wall thickening and can be life-threatening if not diagnosed promptly.
- Invasive Rectal Infection (e.g., Necrotizing Fasciitis): This is a rare but potentially deadly condition that requires prompt diagnosis and treatment.
- Ischemic Proctitis: This condition can cause rectal wall thickening and can be life-threatening if not diagnosed and treated promptly.
Rare Diagnoses
- Rectal Sarcoma: A rare type of cancer that can cause rectal wall thickening.
- Eosinophilic Colitis: A rare condition characterized by eosinophilic infiltration of the colon, which can cause rectal wall thickening.
- Amyloidosis: A rare condition that can cause rectal wall thickening due to amyloid deposition in the rectal wall.