Severe lesions of the large intestine
In some cases, intestinal infections take a fulminant form, which is characterized by extremely pronounced toxicosis and severe, agonizing abdominal pain. Extensive ulcerated defects form in the wall of the large intestine. Early-age children, women during pregnancy and lactation, and debilitated patients with malnutrition are most susceptible to this course of events.
Necrotic colitis is distinguished by an extreme degree of severity. The patients' condition is assessed as very severe. High fever, intense cramping abdominal pain are observed, and the stool acquires a characteristic "meat slop" appearance. The main danger of this condition is the purulent melting of the intestinal walls. This inevitably leads to perforation, the release of fecal masses into the abdominal cavity, and the development of diffuse peritonitis. In the case of intestinal perforation or lack of response to conservative anti-amoebic therapy, the patient is indicated for emergency surgical treatment.
Toxic megacolon and amoeboma
Toxic megacolon is a dangerous complication. The triggering factor for its development is often the use of corticosteroids, as these drugs inhibit the production of interleukin-1-beta and interleukin-8. When megacolon develops, standard anti-amoebic therapy generally proves ineffective. Early recognition of the pathology and prompt surgical intervention are critically important to save life.
Another specific formation is amoeboma (or amoebic granuloma). It is based on the pathogenic proliferation of annular granulations directly in the tissues of the intestinal wall.
- Localization: the cecum or ascending colon is most frequently affected; granulomas are found significantly less often in the hepatic and splenic flexures.
- Clinical picture: symptoms and X-ray findings completely mimic a true intestinal tumor, in particular, large bowel cancer.
- Complications: upon reaching large sizes, amoeboma causes narrowing of the intestinal lumen, leading to partial or complete intestinal obstruction.
- Outcome: with timely initiated treatment, granulomas are capable of resolving completely.
Extraintestinal complications: abscesses of internal organs
The infection can spread beyond the gastrointestinal tract, manifesting as the formation of abscesses. The most frequent localization is the liver; the lungs, brain, and other organs are affected less often.
Extraintestinal complications have their characteristic features of progression:
- Development timeline: abscesses usually occur 1–3 months from the onset of manifestations of the intestinal infection (in rare cases, several years later). They can appear even after a mild course of the disease. In approximately 6–10% of cases, abscesses form without any prior history of large bowel lesions.
- Onset and fever: manifestation is acute. A remitting, irregular, or continuous type of fever is characteristic (hectic is rare). Temperature spikes are accompanied by chills and pronounced night sweats.
- Pain syndrome: the patient feels a dull, constant pain in the epigastrium or right upper quadrant of the abdomen. If the diaphragmatic surface of the liver is affected, right-sided pleural pain occurs with radiation to the shoulder.
- Clinical features: pain noticeably intensifies with coughing and any movement. Because of this, patients reflexively support the liver area with their hands when walking. Cough is a possible additional symptom.
One should remember the atypical course: if a single small-sized abscess has formed, the patient's body temperature often remains normal.
Briefly: answers to topical questions
What instrumental methods are used to diagnose amoeboma and differentiate it from large bowel cancer?
An X-ray examination method is used to diagnose amoeboma. At the same time, differential diagnosis with large bowel cancer can be difficult, as this formation clinically and radiographically manifests as a true intestinal tumor. Amoeboma represents a proliferation of annular granulations in the tissues of the intestinal wall. Most often it is localized in the cecum or ascending colon, less frequently affecting the hepatic and splenic flexures. Other instrumental methods for differentiating amoeboma from malignant neoplasms are not described in the materials.
Which pharmacological drugs are used for conservative anti-amoebic therapy?
The sources indicate the following for anti-amoebic therapy:
- Luminal amoebicides: diloxanide furoate, diiodohydroxyquin, paromomycin, etofamide.
- Systemic tissue amoebicides: metronidazole, tinidazole, ornidazole.
The choice of treatment regimen depends on the clinical form and localization of the process. For complications of amoebiasis in combination therapy with the mandatory use of specific anti-amoebic drugs, emetine, metronidazole, and chloroquine are also indicated.
Class and exam questions
Why can the intake of corticosteroids trigger toxic megacolon?
Corticosteroid drugs inhibit the production of interleukin-1-beta and interleukin-8, which disrupts the immune response and contributes to the development of severe bowel wall damage.
What disease should amoeboma be differentiated from?
Clinically and according to X-ray data, amoeboma is very similar to a true tumor, which is why it is primarily differentiated from large bowel cancer.
How does a patient with a liver abscess behave during movement?
Pain in the liver area sharply increases with movement and coughing, which is why patients are forced to reflexively support the right hypochondrium with their hands when walking.
Is a liver abscess always accompanied by a high temperature?
No, not always. In an atypical course, when there is only a single small-sized abscess, body temperature may remain within normal limits.
What else to study on this topic
- Pathogenetic mechanisms of the formation of extensive ulcerative lesions in the fulminant form of intestinal infections.
- Differential diagnosis of amoeboma and malignant neoplasms of the large intestine.
- Features of surgical tactics in the development of purulent peritonitis against the background of necrotic colitis.
- Causes of the formation of extraintestinal abscesses without prior clinical manifestations of the intestinal form of infection.
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