Duodenal necrosis as the presenting manifestation of polyarteritis nodosa

Isolated duodenal ischemia of unknown etiology: a case report

Background

Acute abdomen is among the most common presentations observed in clinical practice. The present study describes a patient with isolated duodenal ischemia as an extremely rare etiology of acute abdomen.

Case presentation

A 79-year-old male with acute abdominal pain, nausea, and vomiting presented to the emergency department of our hospital. He was diagnosed with myelodysplastic syndrome 7 years ago, for which he took thalidomide and erythropoietin as the main medications. The prominent findings of the physical examination were hypotension, tachycardia, fever, mild hypoxemia, and epigastric and right upper quadrant tenderness of the abdomen. Except for mildly increased creatinine and lipase, other laboratory findings were in concordance with myelodysplastic syndrome. Due to the patient’s oliguria, the computed tomography (CT) scan was performed without contrast, which, together with the ultrasonography, raised the clinical impression of acute pancreatitis. The patient’s hypotension was refractive to supportive treatment, resulting in progressive deterioration of the clinical condition. A later contrast-enhanced CT scan suggested microvascular ischemia of the duodenum. An emergent Whipple’s procedure was planned initially, which was later switched to a damage control surgery due to the patient’s cardiac arrest during the surgery. Despite all the supportive therapy provided at the intensive care unit, the patient expired of a cardiac arrest which occurred two hours after the termination of the surgery.

Conclusions

The high rate of mortality in duodenal necrosis necessitates emergent diagnosis and proper management. When other common etiologies are ruled out, clinicians should consider duodenal pathology as a potential cause of acute abdomen.

Endoscopic Findings of Upper Gastrointestinal Involvement in Primary Vasculitis

Background/Aims

Gastrointestinal involvement in vasculitis may result in life-threatening complications. However, its variable clinical presentations and endoscopic features, and the rarity of the disease, often result in delayed diagnosis.

Methods

Clinical characteristics, endoscopic features, and histopathological findings were reviewed from medical records.

Results

Of 6,477 patients with vasculitis, 148 were diagnosed as primary vasculitis with upper gastrointestinal involvement. Of these, 21 cases (14.2%) were classified as large-vessel vasculitis, 17 cases (11.5%) as medium-vessel vasculitis, and 110 cases (74.3%) as small-vessel vasculitis. According to the specific diagnosis, IgA vasculitis (Henoch-Schönlein purpura) was the most common diagnosis (56.8%), followed by Takayasu arteritis (14.1%), microscopic polyangiitis (10.1%), and polyarteritis nodosa (6.8%). Gastrointestinal symptoms were present in 113 subjects (76.4%), with abdominal pain (78.8%) the most common symptom. Erosion and ulcers were striking endoscopic features, and the second portion of the duodenum was the most frequently involved site. Biopsy specimens were obtained from 124 patients, and only eight (5.4%) presented histopathological signs of vasculitis.

Conclusions

Diagnosis of vasculitis involving the upper gastrointestinal tract is difficult. Because of the widespread use of endoscopy, combining clinical features with endoscopic findings may facilitate making appropriate diagnoses; however, the diagnostic yield of endoscopic biopsy is low.

Duodenal necrosis secondary to a closed-loop bowel obstruction with novel reconstruction

Duodenal necrosis is rare in children and presents a significant surgical challenge. We describe a 12-year-old girl who presented with duodenal necrosis secondary to a closed-loop bowel obstruction. We describe the diagnostic images, operative findings, and a novel reconstruction technique. This case highlights an alternative strategy for reestablishing gastrointestinal and biliopancreatic continuity while avoiding more complex procedures.

Gastrointestinal involvement in polyarteritis nodosa

Polyarteritis nodosa (PAN) is a necrotizing, focal segmental vasculitis that affects predominantly medium-sized arteries in many different organ systems. It is associated with hepatitis B virus (HBV) in about 7% of cases, a decline from about 30% before the mandatory testing of blood products and the widespread vaccination programs. HBV PAN is an early postinfectious process. The hepatitis is silent in most cases, with mild transaminase level increases in 50% of patients. Gastrointestinal involvement occurs in 14% to 65% of patients with PAN. Postprandial abdominal pain from ischemia is the most common symptom. When transmural ischemia develops, there may be necrosis of the bowel wall with perforation, associated with a poor prognosis. Liver involvement occurs in 16% to 56% of patients, although clinical manifestations related to liver disease are quite rare. Acalculous gangrenous cholecystitis may develop owing to arteritis involving the wall of the gallbladder. Microaneurysms on arteriography or computed tomography angiography are characteristic of PAN, but are seen in other conditions. Tissue biopsy may confirm the diagnosis, although involvement is segmental. Corticosteroids are used for non-HBV PAN with cyclophosphamide added for severe disease. For PAN related to HBV, a 2-week course of corticosteroids is begun, with plasma exchanges and an antiviral agent. Corticosteroids and cyclophosphamide have improved patient outcome so that the 1-year survival rate is now about 85%.

Fatal polyarteritis nodosa with gastrointestinal involvement in a child

Polyarteritis nodosa (PAN) is a necrotizing angiitis that predominantly affects small- and medium-sized arteries. Polyarteritis nodosa occurs rarely during childhood. Boys and girls seem to be equally affected, with a peak at the age of 10 years. Rarely, severe and fatal gastrointestinal involvement is seen in PAN. Here, we report a 15-year-old boy with PAN, who had gastrointestinal involvement with multiple aneurysms of the hepatic and superior mesenteric arteries. This involvement could be demonstrated with conventional angiography and gastrointestinal bleeding scintigraphy. The progression of the symptoms and the decrease in the size of the aneurysms were noted after combination treatment with cyclophosphamide and prednisolone, but there was severe bleeding from small bowel, and it was taken under control by resection of jejunum. However, the patient died because of sepsis. In conclusion, severe gastrointestinal involvement in PAN is usually fatal despite aggressive therapy, as is the case in our patient.

Pseudovasculitis and corticosteroid therapy

Pseudovasculitis, vasculitis-like syndromes, vasculitis look-alikes, or mimics of vasculitis represent a heterogeneous collection of disorders that are capable of simulating vasculitis. Inappropriate diagnosis leads to delay or absence of proper management and exposure to potentially deleterious treatment modalities such as corticosteroids and cytotoxic agents. We report the case of fibromuscular dysplasia suspected to be a polyarteritis nodosa. The progression of the lesions visualized by the ultrasonographic study and computed tomography (CT) scan after 10 days of treatment led to an emergency laparotomy. The possible deleterious role of steroids given to treat the suspected vasculitis is discussed.