A Rare Cause of Acute Colonic Pseudo-obstruction: Ogilvie's Syndrome Caused by Herpes Zoster.

TO THE EDITOR: Acute colonic pseudo-obstruction (ACPO, also called Ogilvie’s syndrome) is a rare disorder characterized by colonic dilatation in the absence of a mechanical cause.1 Although ACPO is an important cause of morbidity and mortality, the pathophysiology is not completely understood. Predisposing factors for ACPO are non-operative trauma, infection (pneumonia and sepsis), cardiac disease (myocardial infarction and heart failure), obstetric/gynecological abdominal/pelvic surgery, neurological disorders (Parkinson’s disease, spinal cord injury, multiple sclerosis, and Alzheimer’s disease), orthopedic surgery, and various other medical and surgical conditions.2

We recently experienced a rare case of ACPO caused by herpes zoster. A 75-year-old female was admitted for right back pain for 4 days. She also complained of a sudden onset of constipation with abdominal distension and discomfort. Physical examination revealed erythematous vesicles involving the right L4 dermatome and marked abdominal distension without tenderness (Fig. 1). Laboratory test results showed no overwhelming abnormalities except sodium 132 (normal: 136–147) mEq/L, chloride 97 (normal: 98–110) mEq/L, and C-reactive protein 1.76 (normal: 0.0–0.3) mg/dL. Abdominal radiography showed diffuse colonic dilatation (Fig. 2A and 2B), however abdominopelvic computed tomography revealed no definite obstructive lesion in the colon. ACPO associated with herpes zoster was diagnosed. There was no underlying disease that could cause ACPO. She was treated with intravenous fluids, oral valaciclovir, bisacodyl, and polyethylene glycol. After 3 days, she had a small bowel movement with gas passing. However, colonic dilatation was still present. Her bowel symptoms gradually improved after conservative management and the colonic dilatation disappeared after 10 days (Fig. 2C and 2D).

Figure 1

Physical examination. (A) Vesicular eruptions involving the right L4 dermatome and (B) marked abdominal distension were noted.

Figure 2

Radiographic findings. (A, B) Abdominal X-ray on admission shows diffuse colonic dilatation. (C, D) Colonic dilatation disappears after 10 days of conservative management.

Herpes zoster mainly involves the sensory neurons. However, motor nerve involvement occurs in about 5% of cases, resulting in diaphragmatic and bladder paralysis.3 Unilateral abdominal wall paralysis due to motor nerve involvement by herpes has rarely been reported.4 Gastrointestinal manifestations of herpes zoster such as colonic pseudo-obstruction and gastroparesis are extremely rare. The mechanism of colonic pseudo-obstruction in herpes zoster is not known. However, extrinsic autonomic or motor neuron involvement has been suggested.5 In addition, direct invasion of the intestinal muscularis propria and myenteric plexus by varicella-zoster virus was reported in an HIV-positive patient with Burkitt lymphoma.5 The interval between onset of the herpes zoster rash and bowel symptom in patients with zoster-associated ACPO is variable. A literature review reported that rashes developed 1 day to several weeks after bowel symptom onset in 48%, 2 days to 1 month before bowel symptom onset in 28%, and simultaneously in 24%.6

Zoster is not uncommon and is generally self-limited. However, it is a rare cause of ACPO, which has a high mortality rate if ischemia or perforation occurs. Therefore, early recognition and appropriate management of unusual gastrointestinal presentations such as ACPO in patients with zoster is important to prevent potential serious outcomes.