1/135. Mucinous cystadenoma of the lung.A 56-year-old male patient came under our observation when a peripheral round mass in his right lung which he had since 1991 and which was believed to be a bronchogenic cyst, showed a volumetric enlargement of 2 cm. After performing a lobectomy of the middle lobe, the histopathological examination revealed the presence of a mucinous cystadenoma of borderline malignancy.- - - - - - - - - - ranking = 1keywords = cystadenoma (Clic here for more details about this article) |
2/135. Retroperitoneal mucinous cystadenoma.A case of retroperitoneal mucinous cystadenoma histologically confirmed in a 21-year-old woman is reported. Although ultrasound, CT and MR detected the tumor, a preoperative diagnosis could not be established by imaging methods. The cystic tumor was removed and microscopic examination revealed a mucinous cystadenoma. Mullerian mesothelial metaplasia of peritoneal invagination into the retroperitoneal space is the most likely explanation for the histogenesis of these tumors.- - - - - - - - - - ranking = 1.2keywords = cystadenoma (Clic here for more details about this article) |
3/135. Operative indications for cystic lesions of the pancreas with malignant potential--our experience.BACKGROUND/AIMS: There are still many important but unclear points regarding the differential diagnosis and operative indications of cystic lesions of the pancreas with malignant potential. Studies of the clinicopathological and molecular biological characteristics of such diseases are necessary. In this paper, we discuss operative indications for this condition based on a review of the literature and our own experience. METHODOLOGY: Seven cases of serous cystadenoma and 9 cases of mucinous cystadenoma or cystadenocarcinoma of the pancreas that were operated on or autopsied in our department from 1980 to 1996 were analyzed clinicopathologically. Small cystic lesions incidentally found in 300 autopsied cases were also studied. Finally, mucin-producing tumors described in several reports were reviewed, and the branch type of this tumor was especially investigated. RESULTS: A marked disappearance of pancreatic acini in the upstream pancreas was found when serous cystadenoma became large. Papillary projection was histologically found in all of the cases. Tumorous invasion to the interstitium was suspected in tumors more than 5 cm in diameter, and malignancy was reported when tumors were larger than 6 cm. As for mucinous cystadenocarcinoma, the patients had a poor prognosis. In 2 of 42 cases with a pseudocyst, small duct cell carcinoma was incidentally found adjacent to the pseudocyst on the duodenal side. With regard to branch-type intraductal papillary neoplasm, 80% of the tumors larger than 4 cm were malignant. Most of the small cystic lesions found in elderly autopsy cases were accompanied by hyperplastic epithelia without evidence of malignancy. CONCLUSIONS: Based on our experience, an operation should be considered and resection is recommended under the following circumstances: 1) cystic lesions in the body and tail of the pancreas in middle-aged women; 2) typical serous cystadenoma larger than 4 cm; 3) mucinous cystadenoma of any size; 4) branch-type intraductal papillary neoplasm larger than about 3 cm; and, 5) pseudocysts of unknown cause. Small cystic lesions in elderly patients should not necessarily be operated on, but should be followed-up carefully.- - - - - - - - - - ranking = 1keywords = cystadenoma (Clic here for more details about this article) |
4/135. Mucinous cystadenoma of the cecum missed at laparoscopic appendectomy. Pitfalls in laparoscopy.We report an unusual case of acute appendicitis caused by a mucinous cystadenoma of the cecum obstructing the lumen of the appendix. At laparoscopic appendectomy, an inflamed appendix was identified and resected. Subsequent histologic evaluation of the appendiceal base revealed mucin lakes. After discovery of a cecal mass at colonoscopy, the patient underwent definitive right hemicolectomy for treatment of a benign mucinous cystadenoma of the appendix.- - - - - - - - - - ranking = 1.2keywords = cystadenoma (Clic here for more details about this article) |
5/135. Micropapillary carcinoma of the parotid gland arising in mucinous cystadenoma.We describe a 45-year-old man who had a 2-year history of a slowly enlarging tumor in the left parotid gland. Histologically, the tumor was a mucinous cystadenoma with focal apocrine differentiation, which revealed a widespread invasive micropapillary adenocarcinoma component. A rim of lymphoid tissue surrounded the margins of the micropapillary carcinoma. The invasive micropapillary adenocarcinoma component was morphologically identical with the invasive micropapillary carcinoma of the mammary gland. The tumor is different from so-far recognized salivary gland tumor entities.- - - - - - - - - - ranking = 1keywords = cystadenoma (Clic here for more details about this article) |
6/135. leiomyoma of the ovary mimicking mucinous cystadenoma.We present a case of ovarian leiomyoma of a 46-year-old woman with a history of a palpable lower abdominal mass. A multiloculated multiseptated mainly cystic mass in the left adnexa on computed tomography (CT) was initially considered to be an ovarian mucinous cystadenoma. This mass, however, was proved to be a left ovarian vascular leiomyoma on the surgical pathology.- - - - - - - - - - ranking = 1keywords = cystadenoma (Clic here for more details about this article) |
7/135. Simultaneous mucinous cystadenoma of ovary and mucinous cystadenocarcinoma of pancreas.Mucinous cystic tumors were discovered synchronously in the tail of the pancreas and in the right ovary of an adult female. Both tumors were amenable to surgical resection. The pancreatic tumor was a noninvasive mucinous cystadenocarcinoma and the ovarian tumor was a mucinous cystadenoma. We feel these tumors represent two primaries, an uncommon occurrence, and not a single primary tumor with metastasis.- - - - - - - - - - ranking = 1keywords = cystadenoma (Clic here for more details about this article) |
8/135. A mucinous tumor of the mesocolon with features of borderline malignancy.Primary mucinous cystadenoma of the mesocolon is a rare tumor with an uncertain histogenesis. A 38-year-old woman was diagnosed with a 17-cm cystic lesion in the left abdomen, identified as a mucinous cystadenoma of the mesocolon. This type of tumor appears rarely in extraovarian sites. We believe that metaplasia, either celomic or mucinous, is the most likely pathogenic mechanism. On rare occasions, a borderline or invasive component may be present.- - - - - - - - - - ranking = 0.4keywords = cystadenoma (Clic here for more details about this article) |
9/135. Clear cell carcinoma of the ovary arising in a mucinous cystadenoma.A 57 year old woman presented complaining of increasing abdominal swelling of six months duration. A mixed solid cystic left ovarian tumour measuring 24 cm in diameter was excised. histology showed numerous cysts lined by benign mucinous epithelium blending imperceptibly into borderline clear cell and mucinous areas that in turn merged with an invasive clear cell carcinoma. To the best of our knowledge, this is the first reported case of clear cell carcinoma arising in a mucinous cystadenoma. The implications for the previously postulated pathogenesis of these tumours are discussed.- - - - - - - - - - ranking = 1keywords = cystadenoma (Clic here for more details about this article) |
10/135. liver cystadenocarcinoma originating in cystadenoma without mesenchymal stroma. Therapeutic strategy in case of atypical radiological criteria. A case report.Optimal treatment of cystadenoma if diagnosed consists of complete resection of the tumor. In case of atypical radiological criteria, therapeutic strategy is not well defined. The attitude we adopt is to regularly monitor the lesion. Surgical removal of the tumor is of course indicated facing any significant change on sonography or tomodensiometry.- - - - - - - - - - ranking = 1keywords = cystadenoma (Clic here for more details about this article) |
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