I experienced a case of a congenital intramural cyst of the uterine fundus. On examination by light and electron microscope it was composed of a single layer of thin atrophied lining epithelium without secretory activity and was found to be derived from the paramesonephric duct. This case is presented with a brief review of the literature.
Cysts

Histopathology of pulmonary lymphangioleiomyomatosis(LAM) is studied using four new cases and six previously reported cases, which include two cases without definite evidence of LAM. The important diagnostic features of this lesion were nodular proliferation of immature smooth muscle and cleft or cyst formation within the nodules of smooth muscle cells. The nuclei of the smooth muscle cells were bigger than those of blood vessels or fibrotic lung, and the direction of nuclei was irregular. The lung parenchyma showed little inflammatory change but there were multiple air cysts with smooth muscle nodules at their margin. There were two cases with exuberant proliferation of smooth muscle nodules and two cases with papilliferous projections of the cells into lymphatic lumen. Whereas, three cases had only a few small slender nodules of smooth muscle cells at the margin of air cyst. The lymphatic lumen with smooth muscle nodules is dilated in four cases but other four cases show collapsed lumen. Pulmonary hemorrhage and hemosiderosis were prominent in three cases. There were variety of histology in terms of the cellularity of smooth muscle nodules, the size of the lymphatic lumen and the degree of pulmonary destruction, which may have significance on the clinical presentation and prognostication.
Cysts

In order to elucidate the possibility of diagnosis in soft tissue cysticercosis in case no parasite in it, immunohistochemical staining with antihuman IgG, IgM, and IgA and anticysticercus antibody in tissue section were carried out. Not only the differential counts of infiltrated plasma cells but also the parasite itself against to the anticysticercus antibody were observed. Materials stained immunohistochemically were consisted of 21 soft tissue cysticercosis with or without parasite. The results were as follows: 1) IgG producing plasma cells were most frequent (45.8+/-18.7) and followed by IgM (14.3+/-0.43) and (4.3+/-5.71). Number of IgG plasma cells were more frequently accompanied in the presence of cysticercus (55.9+/-17.7) than in the absence of parasite (39.7+/-17.1). 2) The mean+/-S.D. of plasma cells positive to the anticysticercus antibody were 28.2+/-18.7. And anticysticercus antibody producing plasma cells were more frequent in the presence of cysticercus (49.2+/-5.16) than in the absence of parasite (15.2+/-9.46). 3) Antigenicity of the cysticercus was strong in inner layer(#) followed by tegument(+) and fibrous layer(-). 4) Therefore, it could be suggested that antibody against to the cysticercus is mainly produced by IgG plasma cells and antigenicity of the worm is strong in the inner layer of cyst wall. In addition, there is a possibility of assisting the diagnosis of cysticercosis with anticysticercus antibody by immunohistochemically.
Cysts

The neurenteric cyst with associated anomalies is the result of an ectoentodermal communication that exists during embryogenesis. The variety of lesions include intraspinal cysts, congenital vertebral deformities, thoracic cyst, malformations of the digestive tract, and occasionally, dysrhaphias of the sinodermal or myelomeningocele type. A case of intraspinal neurenteric cyst in a 3-year-old boy is presented. He presented with cyclic abdominal pain, fever and constipation of 30 days' duration. These symptoms progressed rapidly into gait disturbance and left hemiplegia. A single epithelial cyst, located ventral to the spinal cord in the lower thoracic region, traversed the cleft of spina bifida of thoracic vertebrae and connected to retromediastinal cyst. The inner cyst wall was lined with pseudostratified ciliated epithelia and a few squamous cells. The cyst wall contained well-developed muscle coat, myenteric plexuses, and scattered seromucinous glands.
Cysts

Eruptive vellus hair cysts are characterized by asymptomatic, skin colored to bluish, or brownish, 1-4mm sized, follicular papules and nodules located on mainly anterior chest, axilla, groin, and thigh. Histopathologic examination reveals cysts containing multiple vellus hairs and the laminated keratinous materials at dermis. We reported 2 cases of eruptive vellus hair cysts developed on the unusual sites, forehead and buttock, respectively.
Cysts

PURPOSE: Percutaneous aspiration with sclerotherapy has been widely used for the treatment of symptomatic or large simple renal cysts. Ethanol has been most commonly used as a sclerosing agent; however, a temporary percutaneous nephrostomy for multiple ethanol injections is necessary to achieve a low recurrence rate. Thus, we used OK-432 as a new sclerosing agent without a temporary percutaneous nephrostomy for multiple injections, and also compared our results with the results of previous studies. MATERIALS AND METHDOS: Between October 2005 and April 2006, 50 patients (63 simple renal cysts) who underwent percutaneous OK-432 sclerotherapy for simple renal cysts were evaluated. The simple renal cysts were aspirated under ultrasonography and fluoroscopy, after which OK-432 was injected into the cyst. Follow-up was performed with ultrasonography or CT scan after 3 months. Regression of the renal cyst or a >70% reduction in size with no symptoms was considered a treatment success. RESULTS: Among 63 renal cysts in 50 patients, complete regression occurred in 17(27.0%). Greater than a 90% reduction in size occurred in 8(12.7%), a 80-90% reduction in size occurred in 21(33.3%), and a 70-80% reduction in size occurred in 15(23.8%); a <70% reduction in size occurred in 2 (3%). The overall efficacies of success were 96.8%. After the procedure, there were only some minor complications, such as mild fever, local pain, and liver function test elevation that subsided with symptomatic treatment. CONCLUSIONS: Percutaneous OK-432 sclerotherapy is simple, safe, and effective and can be an alternative first-line therapy of simple renal cysts.
Cysts

We report a patient with autosomal dominant polycystic kidney disease(ADPKD) undergoing maintenance hemodialysis who underwent transcatheter arterial embolization(TAE) of the renal arteries to control the persistent renal hemorrhage. In 1991, the patient had been diagnosed as having ADPKD by computed tomography(CT) of abdomen. In 1997, the patient started hemodialysis. In October 2000, she was admitted to our hospital because of gross hematuria and both flank pain. Abdominal CT showed marked enlargement of the bilateral kidneys with numerous cysts. Renal angiography using the Seldinger technique showed stretched and deformed segmental renal arteries without active bleeding. Renal hemorrhage was continued despite of medical treatment. TAE with stainless steel coils was performed on both renal arteries. Renal bleeding was stopped immediately after TAE and anemia was improved and stabilized thereafter. Follow-up CT after five months later TAE showed the marked decrease in size of both kidneys, and patient's abdominal symptoms were disappeared too. This report shows that TAE is a safe and effective therapy for ADPKD patients with persistent renal bleeding refractory to medical therapy.
Cysts

We reviewed a total of 15 cases of heterotopic pancreatic tissue within the gastrointestinal wall(intramural type), and compared with 3 extramural ones. Intramural heterotopic pancreatic lesions were located in the antrum(33%), pylorus(20%), and body of stomach(7%), and the remainders in the duodenum(40%). Only two cases presented with chinical symptoms by their existence. Two of them were situated within the submucosa, 3 in the muscularis, 6 in submucosa-muscularis, 2 in the muscularis-subserosa, and 1 in the susbmucosa-subserosa. Intramural type was featured with their structural heterogeneity compared to the extramural ones; 10 cases showed participation of gastrointestinal mucosal elements, and some accompanied tissue elements that were indistinguishable from submucosal epithelial heterotopia or microduplication cyst of the stomach. Langerhans islets were found in 67%, and one developed islet cell tumor. The above results suggest that the initially engrafted heterotopic pancreatic tissue becomes modified and presents with heterogeneity of endodermal and mesodermal tissue-derived components by its intramural growth during the gastrointestinal organogenesis; failure of opening of its drainage system into the gastrointestinal lumen may result in the increase of intraductal pressure with subsequent atrophy of the acinar tissue and various metaplastic changes of ductal epithelium, aside from induction of smooth muscle coat around the heterotopic tissue.
Cysts

Congenital cyst of the lung is a type of rare pulmonary disease. This lesion was initially introduced by Morgagni in 1769. Thereafter many other cases were reported. Etiology or developemental pathogenesis of this lesion is not certain, but abnormal developement of embryonic lung bud during the embryonal period is highly suspected. This lesion is two times more frequently located at the left lung, but both sides of the lung may be involved. This lesion is largely asymptomatic and found incidentally but can be evoked respiratory symptoms and also can be died due to only this lesion. So accurate diagnosis and treatment in the early period are very important. Therefore, 32 cases of congenital cyst of the lung reported at the department of pathology, seoul national university hospital from 1. 1986 to 12. 1984 were reviewed and classified with clinical, gross and microscopic findings based on the Buntain's classification. Among 32 cases of congenital cyst of the lung, 16 cases were bronchogenic cysts and were largest in number, 8 cases were pulmonary sequestration, 6 cases were congenital cystic adenomatoid malformation (CCAM) and 2 cases were pulmonary emphysema. In cases of bronchogenic cyst, involved age was variable from 7 months to 51 years and large cases were asymptomatic. Grossly, 15 cases were solitary cyst and only one case was multiple. Size was also variable from 3 cm to 11.5 cm. Microscopically, cyst wall was lined by pseudostratified ciliated columnar epithelium with gobet cells, mucous secreting glands, smooth muscle fibers and fibrous interstitial tissue. Three cases were also exhibit cartilage at the wall. In cases of CCAM, there were involved below the 7 months old boys and girls. Four cases were confirmed at the autopsy, other 2 cases were confirmed at the surgical specimens which were found incidentally or due to generalized cyanosis. Microscopic findings were similar in all cases showing relatively well demarcated multiple small cysts with adenomatous proliferation. Lining epithelial cells were tall columnar, pseudostratified ciliated columnar epithelium with occasional mucous secretion. Stroma also exhibit adenomatous proliferation lined by simple columnar or cuboidal epithelium. In cases of pulmonary sequestration, 7 cases were intrapulmonary, other one case was extrapulmonary sequestration. In five cases, systemic large vessel were confirmed. Microscopically it was composed of irregularly dilated bronchiolar structures lined by pseudostratified ciliated columnar epithelium.
Cysts

The accessory ovary can be defined as an extraovarian tissue that is located near the normal ovaries and is connected to the broad ligament, infundibulopelvic ligament or utero-ovarian ligament. It has very rarely been reported. The majority was found during abdominopelvic surgeries for any other purposes, because they were usually small and less than 1 cm in diameter adn gave no particular symptoms related simply to their presence. We reported a case of accessory ovary in which developed a simple cyst of a largest diameter of 12 cm, and discussed the significance of the accessory ovary in clinical and pathological aspects.
Cysts