Search results for "Cyst"
showing 10 items of 1960 documents
Keratocystic odontogenic tumor: A biopsy service’s experience with 104 solitary, multiple and recurrent lesions
2016
Background Keratocystic odontogenic tumor (KCOT) is a clinically significant cystic lesion of odontogenic origin. This study aimed to retrospectively review and describe the clinicopathologic features of KCOT and to objectively compare the clinical and histological features of solitary, multiple and recurrent KCOT in a Saudi Arabian population. Material and Methods Biopsy request forms, pathology records and archival materials (all histological slides) of 104 cases of KCOT from 75 patients were retrieved. Demographic and clinical details as well as histological evaluation were analyzed and compared between the 3 groups using chi-squared or Mann-Whitney tests of association as appropriate. R…
Automated DNA-image cytometry: a prognostic tool in infiltrating bladder carcinoma?
1987
In a retrospective study, paraffin-embedded cystectomy specimens obtained from 46 patients with bladder cancer (stage pT1 — pT4a, pN0, pN2) were analysed for tumor DNA ploidy and proliferation using automated image cytometry (LEYTAS). In 41 cases, DNA ploidy could be measured. Estimation of proliferation was possible in 26 tumors. The number of cells with a DNA content higher than 5C could be calculated in 38 of the tumors. All these three parameters are shown to correlate with patient outcome.
Primary intraosseous squamous cell carcinoma arising in dentigerous cyst: Report of 2 cases and review of the literature
2015
Dentigerous cysts are one of the most common odontogenic cysts of the oral cavity. Odontogenic cysts can give rise to a variety of neoplasms. Carcinoma arising in a dentigerous cyst is extremely rare, with a review of literature showing near 30 cases. The present report describes 2 cases of primary intraosseous squamous cell carcinoma originated from a dentigerous cyst. The first one refers to a 57-year old female with a persistent lesion in the left retromolarregion and diagnosed with squamous cell carcinoma originated fromthe incomplete excision of the lower third molar follicle during its surgical extraction. The second case describes the case of an 18-year old male with an impacted uppe…
Fibropolycystic Liver Disease: CT and MR Imaging Findings
2005
Fibropolycystic liver disease encompasses a spectrum of related lesions of the liver and biliary tract that are caused by abnormal embryologic development of the ductal plates. These lesions (congenital hepatic fibrosis, biliary hamartomas, autosomal dominant polycystic disease, Caroli disease, choledochal cysts) can be clinically silent or can cause signs and symptoms such as cholangitis, portal hypertension, gastrointestinal bleeding, infections, and space-occupying masses. The different types of fibropolycystic liver disease demonstrate characteristic findings at computed tomography (CT) and magnetic resonance (MR) imaging. Patients with congenital hepatic fibrosis typically have imaging…
Squamous odontogenic tumor-like proliferation in a radicular cyst: a case report
2013
The squamous odontogenic tumour is a rare benign neoplasm whose aetiology remains unknown. It usually appears in the jaw and its origin could be related to the ephitelial remnants of Malassez. Histologically comprises numerous islets of squamous, non-keratinized, well-differentiated and rounded epithelial cells a fibrous stroma without signs of atypical cells. There is a non-neoplastic lesion with the same histological pattern than the squamous odontogenic tumour. This entity is characterized by squamous odontogenic tumour proliferations isolated into the cyst wall of an odontogenic cyst. It is rare and has a benign behavior. It has been suggested that these epithelial proliferations could …
Coexpression of extracellular matrix glycoproteins undulin and tenascin in human autosomal dominant polycystic kidney disease.
1993
Autosomal dominant polycystic kidney disease (ADPKD) is the most common entity of cystic diseases of the kidney leading to end-stage renal insufficiency. Changes in extracellular matrix (ECM) are regarded to be an important pathogenic factor connected with the genes assumed to be responsible for human ADPKD. In order to assess the biological significance of altered expression and deposition of ECM glycoproteins for human ADPKD at molecular levels fresh-frozen tissue from ADPKD kidneys, fetal kidneys and normal adult kidneys were comparatively tested by immunohistochemistry for the presence of multifunctional ECM glycoproteins undulin, tenascin and fibronectin, interstitial collagen types I,…
Cellular schwannoma of the retroperitoneum with cystic degeneration, mimicking an ovarian cyst, with CKAE1/AE3 and desmin expression.
2014
Schwannoma is an encapsulated benign tumour usually presenting as a solitary mass on the flexor surfaces of the extremities, neck, mediastinum, posterior spinal roots and cerebellopontine angle, an...
Distribution of factor XIIIa containing cells and collage nous components in radicular cysts: histochemical and immunohistochemical study
2011
Objective: 1) To differentiate various connective tissue layers in radicular cysts 2) To find the correlation between FXIIIa containing cells and fibrosis. Factor XIII, fibrin stabilizing factor, stabilizes the clot for blood coagulation and is also responsible for connective tissue organization in healing and tissue repair. FXIIIa has an important role during the process of fibrosis in various lesions, so we conducted a study to find its role in radicular cyst. Study Design: 10 cases of radicular cyst, reported in our hospital were selected. Clinical and follow up data of those cases were collected from the archives. Material and Methods: Histochemical analysis with Masson’s trichrome was …
A possible inflammatory reaction in a lateral neck cyst (branchial cyst) because of odontogenic infection
1994
Abstract We present the case of a woman who suffered from an acutely infected diffuse mass in the right neck. This mass had grown rapidly after difficult extraction of a tooth. Histologic analysis of the excised material revealed a lateral neck cyst with a lymph node that showed signs of an acute inflammation near the cyst. These findings support the theory that a preexisting lateral neck cyst may be “activated” by an intraoral inflammation. The different theories of the origin of lateral neck cysts are presented and discussed in the context of the case description.
Malignant proliferating trichilemmal tumours: an histopathological and immunohistochemical study of three cases with DNA ploidy and morphometric eval…
1998
Aims: Malignant proliferating trichilemmal tumours (MPTT) are rare neoplasms capable of tissue invasion and metastasis, the diagnosis of which is based essentially on histological features. In difficult cases, however, evaluation of additional parameters may be needed to diagnose malignancy. Methods and results We report three cases of MPTT in which, in addition to the histological features, we have determined the DNA ploidy, nuclear area and proliferative fraction. CD34 immunoreactivity has also been tested. Two cases were aneuploid, and one diploid with increased proliferating index. PCNA immunostaining labelled 40% and 80% of tumour cells in aneuploid tumours and 30% of the diploid neopl…