Histopathology differentiates acute self-limited colitis from ulcerative colitis

Area of Science:

• Gastroenterology
• Pathology

Background:

• Differentiating acute self-limited colitis (ASLC) from chronic ulcerative colitis (CUC) is essential for appropriate patient management, especially in cases of acute bloody diarrhea.
• Clinical, endoscopic, and microbiologic factors have shown limited success in reliably distinguishing these conditions early in their presentation.

Purpose of the Study:

• To investigate the utility of clinical, endoscopic, microbiologic, and histologic parameters in reliably and quickly differentiating ASLC from CUC.

Main Methods:

• Prospective study involving 48 patients with ASLC, 36 with their first attack of CUC (CUC(F)), and 84 with recurrent CUC flares (CUC(R)).
• Evaluation included clinical presentation (fever, pain, time to presentation), endoscopic severity, microbiologic analysis, and histopathologic examination of biopsy specimens.

Main Results:

• Clinical and endoscopic parameters, including fever, abdominal pain, and time to presentation, did not effectively distinguish between the groups.
• Microbiologic studies identified infectious agents in only 42% of ASLC patients.
• Histopathology proved to be the sole reliable differentiator: CUC cases (both CUC(F) and CUC(R)) consistently showed plasmacytosis in the lamina propria and mucosal distortion, features absent in ASLC. No histological misdiagnosis occurred.
• Focal cryptitis in resolving ASLC may mimic Crohn's disease, necessitating clinical correlation.

Conclusions:

• Histopathology is the definitive diagnostic tool for rapidly differentiating ASLC from CUC.
• Biopsy specimens are most diagnostic during the acute phase of illness, typically within the first four days of symptom onset.