Transanal resection of rectal lipoma mimicking rectal prolapse: description of a case and review of the literature

Transanal Resection of a Prolapsed Rectal Lipoma: A Report of a Rare Case

Lipoma is a benign tumor that arises from mesenchymal cells and is considered relatively rare. Although lipomas can develop anywhere in the digestive tract, they are seldom found within the intestinal tract. Typically asymptomatic, colonic lipomas usually do not require treatment unless they result in symptoms that warrant surgical intervention. In this case, a 68-year-old male patient presented to the colorectal clinic with complaints of chronic constipation lasting five years, along with a bulging protrusion through the anus that could be reduced by the patient's finger. He reported no history of abdominal pain, change in bowel habits, rectal bleeding, melena, weight loss, fever, or night sweats. During colonoscopy, large subepithelial lesions, measuring greater than 2 cm, were observed proximal to the anal verge. This case report highlights the significance of accurately diagnosing colonic lipomas to prevent potential misdiagnoses as malignancies or rectal prolapses. Additionally, we advocate for treatment strategies tailored to several factors, including the lipoma's size, location, and any associated symptoms.

Rectum lipoma incarcerated in anus as a cause of abundant rectorrhagia

INTRODUCTION: Lipomas are slow growing, benign tumors of mesenchymal origin. In most cases, they are incidental findings during endoscopic examinations. Lipomas in the gastrointestinal tract are rare entities with the lowest rate of occurrence in the rectum. They are mostly asymptomatic, but if they are larger than 4 cm can cause pain, intussusception, bleeding, volvulus, prolapse and weight loss. The aim of presented case report is to demonstrate that abundant rectorrhagia can be caused by a rare entity such as rectal lipoma. CASE REPORT: We present the case of a fifty-year-old male patient with a soft-structure prolapse through the anus accompanied by extensive bleeding. After repositioning, the structure was endoscopically removed. Histopathological analysis confirmed the presence of a lipoma. CONCLUSION: Rectorrhagia can be a clinical manifestation of this rare condition - incarcerated rectal lipoma and should be considered in practice as a differential diagnosis in cases where existence of more common conditions like hemorrhoidal disease and malignant tumors is excluded.

Beyond adenocarcinoma: MRI of uncommon rectal neoplasms and mimickers

OBJECTIVE

To provide a review of rare rectal tumors beyond adenocarcinoma.

RESULTS

Rectal cancer is a common malignancy, both in the United States and abroad. In addition to adenocarcinoma, abdominal radiologists will encounter a variety of other less common rectal masses, both benign and malignant neoplasms as well as non-neoplastic mimickers. Familiarity with these conditions and their characteristic features on MRI is useful in clinical practice. In this article, a number of such conditions are discussed, with an emphasis on distinguishing features on MRI of the rectum.

CONCLUSION

Familiarity with the MRI features of rare rectal tumors beyond adenocarcinoma, as well as a small number of non-neoplastic mimics, is important for abdominal imagers to make diagnostic differentials and to assist in treatment planning.

Laparoscopic segmental resection of the rectum for upper rectal intussusception caused by a giant rectal lipoma: A case report

RATIONALE

Colonic lipomas are rare benign tumours, usually without any symptoms, and most occur in the caecum and ascending colon. We describe a patient with upper rectal intussusception caused by a giant rectal lipoma; no similar report of this type of case has been published.

PATIENT CONCERNS

We report the case of a patient who suffered from repeated bloody stools. A wide pedicle polyp (size, 6.5 × 4.5 × 3.5 cm) was detected at the 15th centimetre of the anal canal via an electronic colonoscope. At the initial part of the rectum, intussusception caused by a 6.5-cm fat-density mass was observed via abdominal contrast-enhanced computed tomography.

DIAGNOSIS

Upper rectal intussusception caused by a giant rectal lipoma.

INTERVENTIONS

Due to the large size of the polyp, an endoscopic polypectomy could not be performed. We performed laparoscopic segmental resection of the rectum (with preservation of the left colic artery [LCA]).

OUTCOMES

The patient was discharged on the 7th postoperative day without any complications, was monitored on a regular basis at our outpatient department and was free of symptoms at a 3-month follow-up visit.

LESSONS

Laparoscopic segmental resection of the rectum with LCA preservation is safe and feasible for the treatment of upper rectal intussusception caused by a giant rectal lipoma.