Diffuse large B-cell lymphoma with distinctive patterns of splenic and bone marrow involvement: clinicopathologic features of two cases.

Two unusual cases of large B-cell lymphoma with predominant splenic and bone marrow (BM) involvement and similar clinical and histopathologic features are described. Both patients presented with nonspecific constitutional symptoms, unexplained cytopenias, and splenomegaly. Splenectomy revealed diffuse red pulp involvement by large B-cell lymphoma.

Fine-needle aspiration cytology findings from a case of pancreatic heterotopia at the gastroesophageal junction.

Pancreatic heterotopia is a well-recognized entity occurring at a variety of sites in the gastrointestinal tract. However, only a handful of patients have been described with this abnormality at the gastroesophageal junction. Cytologic descriptions of pancreatic heterotopia in general are scant in the literature.

Solitary fibrous tumor of the cerebellopontine angle with salivary gland heterotopia: a unique presentation.

We report the unique association of a solitary fibrous tumor of the cerebellopontine angle with ectopic salivary gland tissue in a 53-year-old woman. The patient, diagnosed 21 years earlier with a right cerebellopontine angle fibrous meningioma, presented with a recurrent mass, which, upon surgical removal, showed features of a solitary fibrous tumor. Strong and diffuse immunoreactivity to CD34 and BCL-2 and a negative epithelial membrane antigen immunostain confirmed the diagnosis.

The sentinel node in colorectal carcinoma. Mapping technique, pathologic assessment, and clinical relevance.

One of the most important prognostic factors in colorectal cancer is the presence or absence of regional lymph node metastases. In many instances, micrometastatic disease may not be found on routine pathologic analysis using hematoxylin and eosin staining, but may be discovered only with immunohistochemical methods or polymerase chain reaction assay. Lymphoscintigraphy with biopsy of the sentinel nodes, defined as the first nodal basin in the drainage pathway of a tumor, was developed to provide accurate staging without the morbidity associated with the classic lymph node dissections performed for melanoma or breast cancer.