Robert R Rickert

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BACKGROUND/AIMS Treatment options for patients with endoscopically removed malignant colorectal polyps are polypectomy alone vs. polypectomy followed by surgery. The aim of this study was to define histopathologic parameters that can be used for clinically relevant treatment decisions. METHODS Five pathologists evaluated 140 polyps for the presence or(More)
A 39-year-old woman had a large asymptomatic left parotid mass that she had apparently not noticed. The clinical appearance suggested a parotid tumor. Aspirated tissue revealed numerous giant cells, histiocytes, and hemosiderin pigment. At surgical exploration a tumor was found deep to the facial nerve involving the temporomandibular joint, which had a(More)
A comprehensive autopsy survey of the large bowel showed that adenomas were very common lesions occurring in about one-half of the 518 cases studied. The great majority were small adenomatous polyps (tubular adenomas), 86.7% measuring less than 10 mm in diameter. Adenomas with a more complex tubulovillous pattern were larger with a mean diameter of 19.0 mm.(More)
In a patient with enteropathy-associated T cell lymphoma. there was dissemination to the brain manifesting as an inflammatory lesion. the intestinal and brain lesions were studied using routine histology, immunohistochemistry, and polymerase chain reaction. The jejunum was involved by a multifocal large cell lymphoma associated with multiple inflammatory(More)
We have reviewed eight cases of Crohn's disease associated carcinoma (CDAC) of the bowel treated at Saint Barnabas Medical Center since 1977. Five patients had colorectal carcinoma in areas of dysplasia within histologically recognizable Crohn's disease. One of the large bowel carcinomas was a diffusely infiltrating signet ring adenocarcinoma (linitis(More)
CONTEXT We have developed tissue microarray-based surveys to allow laboratories to compare their performance in staining predictive immunohistochemical markers, including proto-oncogene CD117 (c-kit), which is characteristically expressed in gastrointestinal stromal tumors (GISTs). GISTs exhibit activating mutations in the c-kit proto-oncogene, which render(More)
Three cases of granular-cell tumor of the perianal region are reported. The clinical and pathologic features of these tumors are reviewed. Their precise histogenesis remains uncertain. The association with pseudoepitheliomatous hyperplasia of the overlying epithelium, which was well illustrated in two of the three cases, is discussed. The lesions are nearly(More)
A malignant parapharyngeal neurilemmoma developed in a 45-year-old woman who had had a benign solitary neurilemmoma removed from the same area nine years previously. Incomplete excision was achieved through a mandibulotomy approach. Malignant schwannoma usually is associated with neurofibromatosis and has a poor prognosis, spreading along the nerve of(More)
During the past several decades, immunohistologic techniques have been developed that may provide important adjunctive information to the diagnostic pathologist. These procedures are now widely available and commonly used in the pathology laboratory. Proper performance of immunohistochemical procedures and interpretation of their results require development(More)