the major lymphoid tissues in teleost fish are the kidneys, thymus, spleen and mucosa-associatedlymphoid tissue including the skin, gills and intestine. the head of kidney (pronephros) is an importanthaematopoietic organ and has morphological similarities with the bone marrow in higher vertebrates. in thisstudy, during 12 months from august 2002 to july 2003, 120 grass carp (10 fish/month) were...

we described a case of lymphoid follicular hyperplasia that arose from the ileum of a 52-year-old woman. her colonoscopy revealed a large mass in the cecum associated with multiple polypoid lesions in the ileum. histologic examination demonstrated severe lymphocytic infiltration and lymphoid follicles with regular germinal centers, without evidence of malignancy. a right hemicolectomy was perfo...

castleman’s disease (angiofollicular lymphoid hyperplasia) includes a heterogeneous group of lymphoproliferative disorders. the cause of this disease remains uncertain. there are two types of localized castleman’s disease: the more common hyaline vascular and the plasma cell types. mixed variant is an uncommon localized lesion in general population. the lesions can occur in any part of the body...

primary intestinal lymphangiectasia (pil) is a rare disease of intestinal lymphatics presenting with hypoproteinemia, bilateral lower limb edema, ascites and protein-losing enteropathy. we report a case of pil in a 22 year old patient from tabriz, iran who presented with anasarca edema, recurrent diarrhea, hypoproteinemia and confirmatory features of pil on endoscopy and histopathology. therefo...

background lower gastrointestinal bleeding (lgib) in children has many different etiologies and is a serious problem that warrants careful diagnostic work-up. materials and methods 164 colonoscopies were done during one year for determining the etiologies of lgib in children who was referred to children's medical center hospital. analyses of results were based on age, sex, etiology and clinical...

sheep (ovine) pulmonary adenocarcinoma (spa), also known as ovine pulmonary adneomatosis (opa),jaagsiekte and ovine pulmonary carcinoma (opc) is a contagious lung tumor in sheep and, more rarely, ingoats. this study was carried out in khuzestan, in the southwest of iran for a period of six months. a totalnumber of 3985 native breed goats were clinically inspected and postmortem examination was ...

castleman's disease is an uncommon cause of lymph node enlargement that mostly involves the mediastinum and lung hilum. it is divided into 2 types: localized, which is usually asymptomatic and presents with a mass lesion; and multicentric, which is characterized by chills, anemia, generalized lymphadenopathy and hepatosplenomegaly. an extrathoracic site of involvement is very uncommon, and may ...

a survey of malignant lymphoid tumors among iranians the frequency. histopathologic features, and clinical aspects of malignant lymphoid tumors. among iranians arc discussed on the basis of 68,000 consecutive biopsies and 1917 autopsies performed over a twenty.five years period in the department of pathology at teheran university. of the 5814 lymph nodes examined on biopsy, 1368 (23%) showed ma...

Non Hodgkin Lymphomas (NHL) are nodal or extra nodal monoclonal infiltrations by malignant lymphoid cells (B Lymphocytes in 80% of cases), which are distinguished as indolent or aggressive forms. According to the heterogeneity of lymphoid cells and their ubiquitous anatomical distribution, these disorders can develop in any organ and have very heterogeneous clinical expressions, but they are...