|Year : 2012 | Volume
| Issue : 1 | Page : 101-103
Angiodysplasia of the colon: A report of two cases and review of literature
AB Olokoba1, OA Obateru1, SA Olatoke2
1 Department of Medicine, University of Ilorin Teaching Hospital, Ilorin, Nigeria
2 Department of Surgery, University of Ilorin Teaching Hospital, Ilorin, Nigeria
|Date of Acceptance||22-Apr-2011|
|Date of Web Publication||20-Mar-2012|
A B Olokoba
Department of Medicine, Division of Gastroenterology, University of Ilorin Teaching Hospital,P.M.B 1459, Ilorin, Kwara state
| Abstract|| |
Angiodysplasias of the colon are enlarged and fragile blood vessels in the colon result in occasional loss of blood from the lower gastrointestinal tract. It may be observed incidentally at colonoscopy or patients may present with lower gastrointestinal bleeding. The objective of this case report is to highlight two cases of colonic vascular ectasia seen using a Pentax video colonoscope at the Endoscopy unit of Crescent hospital, Ilorin. The first patient is an 85-year-old man, who presented with constipation, left-sided abdominal pain, and weight loss of two weeks duration. There was no anorexia, abdominal swelling, diarrhea, or hematochezia. Abdomino-pelvic ultrasonography showed normal findings. Colonoscopy done, reaching the ileo-cecal valve and caecum, showed an area of dilated tortuous blood vessel (vascular ectasia) in the wall of the descending colon approximately 45 cm from the anal verge, with no features of bleeding. No ulcers or mass lesion was seen. Colonoscopy showed angiodysplasia of the colon. The second patient is a 30-year-old female trader who presented with two days history of massive hematochezia of about 7 episodes prior to presentation with an estimated blood loss per episode of about 300 ml. There were clinical features of shock. Packed cell volume at presentation was 14%. She was transfused with 4 units of fresh whole blood. Post stabilization, colonoscopy was done 5 days after bleeding had stopped, which revealed an area of erosion with mucosal blood clot about 27 cm from the anal verge. An area of angiodysplasia was seen. No hemorrhoids or mass lesion was seen anywhere in the colon.
Angiodysplasia is an uncommon finding in Ilorin. These are the first reported cases of angiodysplasia of the colon from Ilorin, Nigeria.
Keywords: Angiodysplasia, bleeding, colon, colonoscopy
|How to cite this article:|
Olokoba A B, Obateru O A, Olatoke S A. Angiodysplasia of the colon: A report of two cases and review of literature. Niger J Clin Pract 2012;15:101-3
|How to cite this URL:|
Olokoba A B, Obateru O A, Olatoke S A. Angiodysplasia of the colon: A report of two cases and review of literature. Niger J Clin Pract [serial online] 2012 [cited 2014 Nov 24];15:101-3. Available from: http://www.njcponline.com/text.asp?2012/15/1/101/94110
| Introduction|| |
Angiodysplasias, arteriovenous malformations or angiomas are the commonest vascular lesions of the gastrointestinal (GI) tract.  They are enlarged, fragile blood vessels in the colon. It is a common cause of lower GI bleeding in the elderly. , It may be asymptomatic and discovered incidentally during colonoscopy.  Patients may present with hematochezia, melena, positive occult blood test or iron deficiency anemia.  It may present as an isolated lesion or multiple vascular lesions.  The exact cause of vascular ectasia is not known but it is thought to occur due to ageing and degeneration of blood vessels.  An hypothesis states that it is due to contraction of the muscular layer leading to partial occlusion of the sub-mucosal veins of the intestinal wall, subsequently the veins become tortuous and dilated.≠  It predominantly affects the cecum and right side of the colon. , It could also affect any part of the large bowel.≠  Angiodysplasias have been reported in association with aortic stenosis, chronic renal failure, Von willibrand' s disease and cirrhosis of the liver. , The incidence of angiodysplasias is 0.8% in healthy people undergoing screening with colonoscopy in the US. , The incidence in other parts of the world is not known because of paucity of data.
There is no sex predilection. It is found predominantly in elderly people above the age of 65 years.  Diagnosis of angiodysplasias may be made using colonoscopy, angiography, and computed tomography (CT) scan and endoscopic forceps biopsy, which may reveal characteristic histopathologic features of dilated, distorted, thin-walled vessels, however they are not generally recommended because of low diagnostic yield and risk of bleeding.  Treatment could be conservative, medical, endoscopic or surgical treatment, but because of risk of re-bleeding surgical treatment is thought to be the best modality of treatment.  However, treatment should be individualized depending on severity. 
| Case Reports|| |
The patient is an 85-year-old Nigerian farmer who presented with constipation, left-sided abdominal pain and weight loss all of two weeks duration. There was no anorexia, abdominal swelling, diarrhoea or haematochezia. A physical examination was unremarkable. No abnormality was detected on digital rectal examination. Abdomino-pelvic ultra- sonography showed normal findings. Colonoscopy done, reaching the ileo-cecal valve and caecum, showed an area of dilated tortuous blood vessel (vascular ectasia) in the wall of the descending colon approximately 45cm from the anal verge, with no features of bleeding
[Figure 1] and [Figure 2], with no other abnormalities seen in the bowel mucosa. No ulcers or mass lesion was seen. Upper gastrointestinal tract endoscopy done was normal. The patient is presently being followed up.
The second patient is a 30-year-old female trader who presented with two days history of massive hematochezia of about 7 episodes prior to presentation with an estimated blood loss per episode of about 300 ml. There were clinical features of shock. Packed cell volume at presentation was 14%. She was transfused with 4 units of fresh whole blood. After stabilization, colonoscopy was done 5 days after bleeding had stopped, which revealed an area of erosion with mucosal blood clot about 25 cm from the anal verge [Figure 3]. An area of angiodysplasia was seen. There was no evidence of further bleeding. No hemorrhoids or mass lesion was seen anywhere in the colon. Upper gastrointestinal tract endoscopy done was normal. She was however discharged on request for follow-up on account of financial constraints.
| Discussion|| |
Angiodysplasia though rare in this part of the world, is known to be one of the commonest causes of lower GI bleeding in the elderly above 65 years of age. Cases of angiodysplasia in individuals less than 40 years have been documented in the literature. , It may be asymptomatic, or present with iron deficiency anemia or positive occult blood. It could also be a cause of massive lower GI bleeding. In our report, the first patient was an 85-year-old man who had left-sided abdominal pain, constipation, and weight loss with no symptoms of blood loss. The second patient was a 30-year-old woman who presented with a life threatening lower GI bleeding. The vascular lesions may be single or multiple. In our report, the first case was multiple while the second was single. Angiodysplasias are incidental findings in 2% of non-bleeding elderly people above 65 years.  Most angiodysplasias are located at the cecum and right side of the colon. However, the first case was seen on the left side of colon, while the second was seen in the region of the sigmoid colon about 25 cm from the anal verge. Both patients need to be followed up in case they eventually require endoscopic intervention (injection therapy, multipolar coagulation, contact probes, and lasers) or surgical resection of the left colon and rectum, which is the definitive treatment for the condition especially for life threatening lower GI hemorrhage due to angiodysplasias. 
Upper gastrointestinal tract endoscopy carried out in both patients were normal. However, further evaluation of the two cases using imaging techniques such as CT scan and angiography could not be done.
| Conclusion|| |
Colonic vascular ectasia may be asymptomatic or cause life threatening lower GI bleeding. Therefore, treatment should be individualized. These are the first reported cases of colonic vascular ectasia from Ilorin.
| References|| |
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[Figure 1], [Figure 2], [Figure 3]