Laparoscopic resection of a lymphangiomatous cyst of the colon: a case report
© Hoffmann et al; licensee BioMed Central Ltd. 2011
Received: 2 February 2011
Accepted: 5 September 2011
Published: 5 September 2011
Lymphangiomatous cysts are submucosal masses that are rarely found in the gastrointestinal tract and more often in the neck, oral cavity, and skin. These cysts are benign tumors and mostly clinically silent. Symptoms include abdominal pain, diarrhea, and rectal bleeding. Their pathogenesis remains unclear.
During a routine ultrasound examination of a Caucasian 25-year-old woman, a structure that raised our suspicions of an ovarian cyst was found. MRI showed a 4.5 cm cystic lesion in the cecal region. Laparoscopic exploration revealed unexpected contact with the ascending colon. The cyst, including its base and of portion of the colon, was resected laparoscopically. The histological examination revealed cystic lymphangioma.
Lymphangiomatous cysts of the colon are very rare lesions. Although their pathology is benign, the recommended treatment is resection, which can be performed with minimal invasiveness.
Benign cystic lymphangiomas are rare intra-abdominal lesions that may be asymptomatic or may mimic a variety of abdominal symptoms, including an acute abdomen. The gastrointestinal tract, including the involvement of the colon, is an unusual location to find these cysts. Although of benign character, cystic lymphangiomas should be removed surgically to prevent further complications and malignancy. This case report concerns a very rare case of an unexpected cystic lymphangioma of the colon that was resected during minimally invasive surgery.
We found a cystic structure in a Caucasian 25-year-old woman incidentally during an ultrasound examination. Our primary clinical suspicions were that it was an ovarian cyst. She had no history of abdominal disease.
The patient's recovery was fast and uneventful. Peristaltic activity appeared on day 1 post-operatively, and the patient was discharged within two days after surgery. At her follow-up examination one year after surgery, the patient was symptom-free without recurrence.
The presence of lymphangiomas in the colon is rare. In 1931, Chisholm and Hillkowitz  reported the first case of colonic lymphangioma published in the literature. The incidence of these lymphatic cysts is thought to range between 1 in 100,000 and 1 in 250,000 hospital admissions worldwide. Other authors found a report of one lymphatic cyst of the colon in a review spanning 10 years and comprising 453,708 gastrointestinal radiographic studies . Geboes et al.  reported one case of a cecal lymphatic cyst in a review of 25 cases of submucosal lesions.
There is no difference between men and women with regard to the incidence of these lesions. In Japan, the incidence of colonic lymphatic cysts appears to be higher than in American and European populations. Colonic lymphangiomas in particular, such as that reported in our case, have a peak incidence in the seventh decade of life .
The etiology of lymphangiomas remains unclear. As most cases occur during childhood , generally in patients younger than two years of age, congenital defects such as the proliferation and dilatation of blind-ended lymphatic sacs have been discussed . Other causes that have been proposed include abdominal trauma, localized lymphatic degeneration, and lymphatic obstruction. Some authors have postulated that lymphangiomas are not true neoplasms but hamartomas [7, 8]. It has been shown that these lesions do not predispose patients to malignancy.
Lymphatic cysts show an equal distribution throughout the colon; however, other parts of the body are more often involved. The most frequent localizations are the neck (75%) and the axilla (20%). Within the abdomen, the most common site is the mesentery . Other possible locations include the omentum, retroperitoneum, mesocolon, pancreas, spleen, and adrenal gland [9–12]. Cases of lymphangiomas involving two organs are extremely rare.
In the largest recent review of patients with lymphatic cysts, a high percentage of the patients showed co-existent lesions. Colorectal carcinomas were found in 7% of the patients, colonic adenomas were found in 16% of the patients .
The possible clinical manifestations include abdominal distension, abdominal pain, loss of appetite, nausea, and vomiting. Furthermore, melena and diarrhea are potential symptoms.
The most frequent classification system used for lymphangiomas is still that of Wegner , who categorized them as simple, cavernous, or cystic.
Because of their mainly asymptomatic character, lymphatic cysts are usually found mostly by accident. Fewer cases are found by examination and management of their complications, which include torsion, rupture, intestinal occlusion, and obstruction of nearby organs. Some cases of cysts mimicking other diseases, such as ovarian cysts, pancreatitis, lipomas, adnexal torsion, volvulus, and congenital duplication of the bowel have also been reported. Prakash et al.  reported a series of cases in children younger than 10 years of age with acute or chronic symptoms due to mesenteric lymphangiomatous cysts. Five of these children were found to have volvulus on exploration.
Natural regression is very unlikely. Treatment options include endoscopic removal for intraluminal lesions smaller than 2 cm and surgical resection for larger lesions. This could be radical, segmental or wedge resection. The risk of developing diverticular formations caused by weakening of the bowel wall is higher in patients who undergo wedge resection. Surgical excision needs to be as complete as possible to reduce the risk of recurrence.
The first case of laparoscopic excision of a cystic lymphangioma was reported in 1996 by Kenney et al. . This patient's cyst was localized in the mesentery of the proximal jejunum. Laparoscopic resection of lymphatic cysts has been performed to remove cysts of the lower omentum and cysts larger than 11 cm . Even when lymphatic cysts are asymptomatic and discovered accidentally, they should be treated surgically because of their potential to grow and cause hazardous complications.
Lymphangiomatous cysts of the colon are very rare lesions that have been reported with increased frequency in recent years as a result of the development and widespread use of colonoscopy. Although these cysts are benign, resection is essential to prevent complications and to definitively exclude malignancy.
Written informed consent was obtained from the patient for publication of this case report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
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