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K51.4 – Inflammatory Polyps of the Colon and Rectum
K51.4 is the ICD-10 code for inflammatory polyps of the colon and rectum. These develop as a result of chronic inflammatory bowel disease and may cause symptoms such as rectal bleeding.
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K51.4 is the ICD-10 code for inflammatory polyps of the colon and rectum. These develop as a result of chronic inflammatory bowel disease and may cause symptoms such as rectal bleeding.
Definition and ICD-10 Classification
K51.4 is a diagnostic code from the International Classification of Diseases (ICD-10) referring to inflammatory polyps of the colon and rectum. These polyps are not true tumours but rather reactive tissue changes that develop as a consequence of chronic inflammation in the large intestine. They are also referred to as pseudopolyps or inflammatory pseudopolyps.
Causes and Development
Inflammatory polyps typically arise in the context of chronic inflammatory bowel disease (IBD), most commonly:
- Ulcerative colitis (diffuse mucosal inflammation of the colon)
- Crohn's disease (segmental inflammation affecting any part of the digestive tract)
During repeated cycles of inflammation and mucosal healing, islands of regenerating tissue can protrude into the bowel lumen, forming polypoid structures known as inflammatory polyps.
Symptoms
Many inflammatory polyps cause no symptoms of their own and are found incidentally during a colonoscopy. When symptoms do occur, they are usually related to the underlying inflammatory bowel disease:
- Blood or mucus in the stool
- Diarrhoea, often bloody
- Cramping abdominal pain
- Sensation of pressure in the lower abdomen
- In rare cases: intestinal obstruction if polyps are large
Diagnosis
Diagnosis is typically made by colonoscopy, which allows direct visualisation of the colonic mucosa and targeted tissue sampling. Histological examination (microscopic analysis of biopsy specimens) is essential to reliably distinguish inflammatory polyps from adenomatous polyps, which carry a risk of malignant transformation.
Key Diagnostic Steps
- Colonoscopy with biopsy
- Histopathological evaluation of tissue samples
- Laboratory tests: inflammatory markers (e.g. CRP, faecal calprotectin)
- Imaging if complications are suspected (e.g. MRI, ultrasound)
Treatment
The management of K51.4 is primarily directed at treating the underlying inflammatory bowel disease. Inflammatory polyps themselves do not usually require separate surgical removal unless there is suspicion of dysplasia or malignancy.
Medical Therapy
- Aminosalicylates (e.g. mesalazine) for anti-inflammatory treatment in ulcerative colitis
- Corticosteroids to manage acute flares
- Immunosuppressants (e.g. azathioprine) for moderate to severe disease
- Biologics (e.g. TNF-alpha inhibitors such as infliximab) for refractory cases
Endoscopic and Surgical Procedures
For large polyps causing symptoms, or when distinction from dysplastic tissue is uncertain, endoscopic resection or, in exceptional cases, surgical intervention may be required.
Prognosis and Follow-Up
Inflammatory polyps are generally benign and do not carry an independent risk of cancerous transformation. However, patients with long-standing chronic inflammatory bowel disease have an overall elevated risk of colorectal cancer. Regular surveillance colonoscopies are therefore recommended. With consistent treatment of the underlying condition, the prognosis is generally favourable.
References
- World Health Organization: ICD-10 International Statistical Classification of Diseases and Related Health Problems, 10th Revision. Geneva: WHO.
- Dignass A. et al.: Updated German S3 Guideline on Ulcerative Colitis (DGVS). Zeitschrift für Gastroenterologie 2019;57(9):1085–1169.
- Feuerstein J.D., Isaacs K.L. et al.: AGA Clinical Practice Guidelines on the Management of Moderate to Severe Ulcerative Colitis. Gastroenterology 2020;158(5):1450–1461.
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