Development features and clinical presentation
The pathology develops against the background of severe immunosuppression. Abdominal complications in cancer patients after a course of chemotherapy may be completely asymptomatic or accompanied by non-specific diffuse complaints of abdominal pain.
The inflammatory process in neutropenic enterocolitis most frequently manifests in the cecum (hence the term typhlitis). However, the lesion is not always limited to a single segment: the infection can spread to the distal parts of the ileum and, in severe cases, involve other sections of the intestinal tract. The basic morphological manifestation is a marked thickening of the affected bowel wall, which may be accompanied by dilatation of the proximally located segments.
Ultrasound diagnostics
Ultrasound examination is recognized as the optimal method both for initial diagnosis and for subsequent dynamic monitoring of the bowel condition.
Key ultrasound signs (when scanning in the longitudinal plane):
- Significant thickening of the cecal wall.
- Loss of the normal layered structure (stratification) of the intestinal wall.
- Possible presence of proximal bowel dilatation above the affected zone.
Computed tomography (CT)
CT examination is reserved for acute, urgent clinical situations. The main purpose of tomography in typhlitis is not just to confirm inflammation, but to rule out life-threatening complications.
On coronal tomograms, the following pathological changes can be detected:
- Signs of ischemia and necrosis: the thickened cecum demonstrates a distinct decrease in contrast agent enhancement.
- Peritoneal and other bowel loop reaction: generalized ascites and hyperenhancement of small bowel loops scattered throughout the abdominal cavity.
It is CT that allows timely suspicion of deep ischemic damage to the wall, which precedes perforation.
Complications
The most formidable outcome of neutropenic enterocolitis is cecal perforation. This condition requires emergency surgical intervention, and the diagnosis is definitively confirmed during laparotomy. Given the muted clinical picture against the background of immunosuppression, timely radiological assessment of bowel wall thickness and blood supply plays a critical role in preventing fatal outcomes.
Briefly: answers to topical questions
What specific types of microorganisms most commonly act as causative agents of neutropenic enterocolitis?
Neutropenic enterocolitis is an opportunistic intestinal infection caused by the patient's own microflora. With persistent febrile neutropenia, special attention is paid to the isolation of multidrug-resistant Gram-negative bacteria, including Pseudomonas aeruginosa, as well as Enterobacteriaceae (Escherichia coli, Klebsiella spp.) producing extended-spectrum β-lactamases or carbapenemases.
With which acute abdominal pathologies should typhlitis be differentiated according to imaging methods?
Radiological diagnosis of neutropenic enterocolitis takes into account the following possible differential conditions: pseudomembranous colitis, AIDS-associated colitis, ischemic colitis, and marked bowel wall edema in liver cirrhosis. Neutropenic colitis is usually accompanied by less pronounced bowel wall thickening than pseudomembranous colitis, whereas pseudomembranous colitis may present with a prominent target sign and accordion sign.
Class and exam questions
Which imaging modality is primary when typhlitis is suspected?
The main method of diagnosis and follow-up is ultrasound. CT is used in acute situations to detect complications such as wall ischemia and perforation.
How to determine bowel wall ischemia on CT in typhlitis?
The key sign of ischemia and impending necrosis on CT is decreased contrast enhancement of the thickened cecal wall.
Which parts of the gastrointestinal tract are involved in the process?
The cecum is most frequently affected, but inflammation can extend to the distal ileum and occasionally to other intestinal segments.
What else to study on this topic
- Hepatic veno-occlusive disease following chemotherapy
- Hepatic steatosis: differentiation from leukemic infiltration
- Acalculous cholecystitis in immunocompromised children
- Fungal esophagitis and pancreatitis in the setting of immunosuppression
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