Fever not explained by infection may occur in patients with malignant lymphoma presumably caused by a release of endogenous pyrogen. Although pyrogen has been found in some tumors with a mixed cell population, production of endogenous pyrogen by the neoplastic cells has not been demonstrated. This report documents the apparently spontaneous synthesis and release of such pyrogen by two human tum...

The right third eyelid of an adult female brown bear (Ursus arctos) was swollen and removed. Histopathology revealed a tumor exhibiting proliferation with mild infiltration, consisting of multi-stratified glandular structures of the innermost laminal neoplastic cells and the basaloid neoplastic cells, and with eosinophilic thick basal lamina material around the glandular structures. Both types ...

Alterations in the tissue microenvironment collaborate with cell autonomous genetic changes to contribute to neoplastic progression. The importance of the microenvironment in neoplastic progression is underscored by studies showing that fibroblasts isolated from a tumor stimulate the growth of preneoplastic and neoplastic cells in xenograft models. Similarly, senescent fibroblasts promote prene...

Several important characteristics of exocrine pancreatic tumor pathogenesis remain incompletely defined, including identification of the cell of origin. Most human pancreatic neoplasms are ductal adenocarcinomas. However, acinar cells have been proposed as the source of some ductal neoplasms through a process of acinar-to-ductal metaplasia. The oncogenic transcription factor c-myc is associated...

The presence of terminal deoxynucleotidyl transferase (TdT) has been determined in neoplastic cells from 50 patients with non-hematologic tumors as well as neoplastic cells from 85 patients with hematologic malignancies. The results indicate that TdT is not present in cells from non-hematologic tumors, Hodgkin's lymphoma, B cell lymphoproliferative disorders, peripheral T cell neoplasms, reacti...

Giant cell fibroma is a unique non neoplastic benign lesion of oral mucosa. It localised reactive proliferation fibrous connective tissue. Surprisingly, this has no specific association with chronic irritation. occurs most commonly in the first three decades life and according to Houston it female predilection. clinically presents as an asymptomatic pedunculate or sessile lump diverse confirmed...

which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. A 53-year-old woman had multiple bilateral axillary and left supraclavicular lymph-node (LN) enlargements for 6 months. LN biopsy revealed anaplastic large-cell lymphoma (ALCL) that was anaplastic lymphoma kinase (ALK)-negative (A. typical " hallmark " cell:...

Several clinicopathological illnesses impact the testis and paratesticular area, which are divided into non-neoplastic neoplastic diseases. Despite availability of imaging tumor marker testing, histopathological examination is primary method for diagnosing testicular lesions. Common indications orchidectomy lesions cryptorchidism, epididymitis torsion. Few non- present as mimickers neoplasm wit...

We collected a series of 136 lung/bronchial and 56 matched lung parenchyma tissue samples from patients who underwent lung/bronchial biopsies and presented invasive carcinoma after lung surgery. The lung/bronchial samples included basal cell hyperplasia, squamous metaplasia, moderate dysplasia, adenomatous hyperplasia, severe dysplasia, squamous cell carcinoma and adenocarcinoma. Matched lung p...

Follicular lymphomas are thought to arise from the follicle center B cells and are characterized by follicular structures that recapitulate many features of normal secondary lymphoid follicles. The neoplastic B cells of follicular lymphoma reside not only in follicles but also in the interfollicular zone in which they form a diffuse infiltrate. We have investigated the frequency, extent, and bi...