Cystic mesothelioma of the peritoneum is a rare benign neoplasm that occurs predominantly in young to middle-aged women and tends to recur locally. Pelvic viscera is the most common predilection site of cystic mesothelioma. Authors report a case of multicystic mesothelioma of the pelvic pelvic peritoneum. The pelvic ultrasonography showed a large, confluent, and thin-walled multilocular cystic mass occupying the pelvic cavity and lower abdomen. The cystic mass was flattened and elongated. Each cyst of variable size was separated by thin septa and filled with translucent fluid. Cystic mesothelioma should be included in the differential diagnosis of the cystic peritoneal masses, especially in reproductive-aged women.
Abdomen ; Diagnosis, Differential ; Female ; Humans ; Mesothelioma* ; Mesothelioma, Cystic ; Peritoneum* ; Ultrasonography ; Viscera

Benign cystic mesothelioma is an uncommon tumor arising from the peritoneal mesothelium. It is characterized by multilocular grapelike, thin-, and translucent-walled cysts, or a unilocular cyst lined by benign mesothelial cells. It occurs predominantly in women of reproductive age, and shows a predilection for the surface of the pelvic peritoneum or visceral peritoneum. Patients usually present abdominal pain and palpable mass, but many cases have been found incidentally during laparotomy. Definite preoperative diagnosis is known to be difficult. Benign cystic mesothelioma has a tendency towards local recurrence, although the gross microscopic features are benign. Moreover, there is controversy over whether this disease is neoplastic or reactive. Initial complete surgical resection and cytoreductive surgery for recurred cases are standard treatments. In the following report, we describe a case of complicated benign cystic mesothelioma in a postpartum woman, involving the pelvic peritoneum and mesoappendix, which was initially misdiagnosed as a periappendiceal abscess.
Abdominal Pain ; Abscess* ; Appendix ; Diagnosis ; Epithelium ; Female ; Humans ; Laparotomy ; Mesothelioma, Cystic* ; Peritoneum ; Postpartum Period* ; Recurrence

Benign cystic mesothelioma (BCM) is a rare mesothelial lesion that forms multicystic masses in the upper abdomen, pelvis and retroperitoneum. Although it is categorized as a benign lesion, it has a tendency to recur. It is uncertain whether the nature of this lesion is reactive or neoplastic, but many articles support the conclusion that it is reactive rather than neoplastic. The majority of cases were associated with a history of a previous abdominal or pelvic operation, or an evidence of endometriosis or a pelvic inflammatory disease, or a combination of these findings. In a 26-year-old woman we experienced a case of BCM which was incidentally discovered at cesarean delivery revealing multilocular thin and translucent walled cysts in the pelvic cavity. Microscopic examination revealed a thin cyst wall that was composed of fibrous connective tissue and lined by internal stratified and external nonstratified single cuboidal epithelia.
Abdomen ; Adult ; Connective Tissue ; Endometriosis ; Female ; Humans ; Mesothelioma, Cystic* ; Pelvic Inflammatory Disease ; Pelvis

The cystic mesothelioma is a very rare tumor which has a clinically and histologically benign nature. Here in reported is the case of a cystic mesothelioma presented as a palpable mass of the inguinal area in a 28-year-old male. Ultrasound showed a cystic tumor at the inguinal canal, and the other physical and laboratory examinations were within normal limits. Grossly, the tumor consisted of cysts containing clear serous fluid and focally solid areas. Microscopically, the tumor was encapsulated with fibrocollagenous wall, and the tumor cells were cuboidal or polygonal epithelial cells with single or multiple layers and had clear cytoplasm. Some areas showed thyroid follicle-like structures. The content of follicle-like structures showed eosinophilia in the H&E section, but positive in mucin stain. Neither cytologic atypia nor mitoses were present. Immunohistochemical staining revealed positive reaction for keratins of low molecular weight, while negative for the thyroglobulin and CEA. These findings suggested mesothelial in origin. We concluded that this tumor was primary rather than metastatic, because he had no evidence of a tumor in gastrointestinal, genitourinary tracts and scrotum.
Adult ; Cytoplasm ; Eosinophilia ; Epithelial Cells ; Humans ; Inguinal Canal ; Male ; Mesothelioma, Cystic* ; Mitosis ; Molecular Weight ; Mucins ; Scrotum ; Thyroglobulin ; Thyroid Gland ; Ultrasonography

Cystic mesothelioma of the peritoneum is a very rare tumor which has a clinically and histologically benign nature. It occurs predominantly in young to middle-ged women and tends to recur locally. It affects chiefly the pelvic peritoneum-articularly the cul-e-ac, uterus, and rectum. We report a case of cystic mesothelioma of the visceral peritoneum which was located anterior to the ascending colon. A 54-ear-ld female patient visited our hospital with a palpable tender mass in the right flank. A computed tomographic scan of the abdomen showed a multicystic mass with an enhancing wall and septum in front of the ascending colon. The patient underwent a right hemicolectomy, and the mass was completely removed. Grossly, the tumor consisted of a multilocular cyst containing clear, serous, or gelatinous fluid and partially solid areas. Microscopically, the solid areas were composed of fibrous tissue, and the lining cells varied from flattened to cuboidal cells with a strong positive reactivity for cytokeratin and mild positive reactivity for epithelial membrane antigen on immunohistochemical staining. These findings suggest that the tumor was mesothelial in origin.
Abdomen ; Colon* ; Colon, Ascending ; Female ; Gelatin ; Humans ; Keratins ; Mesothelioma, Cystic* ; Mucin-1 ; Peritoneal Neoplasms ; Peritoneum ; Rectum ; Uterus

Mesothelioma is a slow-growing insidious lesion of neoplastic aetiology arising from the pleural, peritoneal or pericardial mesothelium. It shows a predilection for the surfaces of the pelvic viscera and has a high rate of recurrence after excision. Cystic mesotheliomas are not associated with asbestos exposure. We report a case of cystic mesothelioma of the peritoneum encasing the ovary, which presented as a cystic adnexal mass. As highlighted in this case and other recent reports, a cystic mesothelioma should not be referred to as a benign cystic mesothelioma, as it has potential for locoregional invasion, as well as distant nodal and serosal metastases. This tumour should be treated with aggressive cytoreductive surgery and appropriate chemotherapy. We review the differential diagnosis of this rare entity and suggest guidelines for its differentiation.
Adult ; Cell Differentiation ; Diagnosis, Differential ; Female ; Humans ; Mesothelioma, Cystic ; diagnosis ; Neoplasm Metastasis ; Ovarian Neoplasms ; diagnosis ; Ovary ; pathology ; Peritoneal Neoplasms ; diagnosis ; Reproducibility of Results ; Tomography, X-Ray Computed

BACKGROUND: Cystic neoplasms of pancreas comprise pathologically heterogeneous groups of tumors with many shared clinical features. Although relatively uncommon, they have a very important place in the surgical pathology of the pancreas because of their high cure rate and their potential confusion with far more common pancreatic pseudocysts. METHODS: We analysed clinical features of 23 patients with pancreatic cystic neoplasm that we treated within 8-years` period (13 women, 10 men, mean age; 47.2 years old) The cystic neoplasms of pancreas comprise 5 serous cystadenoma, 3 benign mucinous cystic tumor, 3 borderline malignancy of mucinous cystic tumor and 4 mucinous cystadenocarcinoma, 4 papillary cystic tumor, 1 cystic teratoma, 1 cystic mesothelioma, 1 lymphoepithelial cyst. 1 mucinous ductal ectasia. RESULTS: Mean tumor size was 6.8cm(3 to 15cm). 73.9 percent had abdominal pain and 26.1 percent had abdominal mass. Computed tomography, ultrasonography and MRI were useful in detecting cystic mass in all cases but was not reliable to distinguish serous from mucinous tumor, benign from malignant. For the treatment of the tumor, 17 distal pancreatectomy with splenectomy, 1 distal pancreatectomy with spleen preserving, 1 proximal pancreatic resection, 2 local excision of pancreas and 1 PPPD were performed. During the period of follow up (mean: 29 months) after surgical resection, 1 recurrence occurred in the patient who underwent local excision for mucinous cystic tumor showing borderline malignancy on histologic finding. All the patients are alive except 2 patients who were lost to follow-up. CONCLUSION: Pancreatic cystic neoplasms are rare and their prognosis are acceptable when they are treated early and properly. So early detection and surgical treatment is the mainstay of management of cystic neoplasm of pancreas.
Abdominal Pain ; Cystadenocarcinoma, Mucinous ; Cystadenoma, Serous ; Dilatation, Pathologic ; Female ; Follow-Up Studies ; Humans ; Lost to Follow-Up ; Magnetic Resonance Imaging ; Male ; Mesothelioma, Cystic ; Mucins ; Pancreas* ; Pancreatectomy ; Pancreatic Cyst ; Pancreatic Pseudocyst ; Pathology, Surgical ; Prognosis ; Recurrence ; Spleen ; Splenectomy ; Teratoma ; Ultrasonography

Antigens, CD34 ; metabolism ; Cysts ; metabolism ; pathology ; surgery ; Diagnosis, Differential ; Female ; Follow-Up Studies ; Gastrointestinal Stromal Tumors ; metabolism ; pathology ; Humans ; Hysterectomy ; methods ; Leiomyomatosis ; metabolism ; pathology ; surgery ; Mesothelioma, Cystic ; metabolism ; pathology ; Middle Aged ; Pelvic Neoplasms ; metabolism ; pathology ; surgery ; Solitary Fibrous Tumors ; metabolism ; pathology ; surgery ; Uterine Neoplasms ; metabolism ; pathology ; surgery ; Vimentin ; metabolism