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Biomedical subjects

T E Snider

Publications and source records attributed to T E Snider.

6 recordsLinked to original sources
PubMed1998

Clear-cell meningioma: diagnosis by fine-needle aspiration biopsy.

Clear-cell meningiomas have a more aggressive behavior than other meningioma subtypes and the cytologic features of clear-cell meningioma have not been described. A fine-needle aspiration biopsy (FNAB) of a sacral clear-cell meningioma was performed in a 28-yr-old woman. This tumor was a metastasis from a posterior fossa meningioma that had been unresectable, but had been present for 7 yr. Cytologically, clear-cell meningiomas have a whorled, syncytial architecture and spindled to polygonal, bland-appearing nuclei. In contrast to the more classic meningioma, the clear-cell variety has vacuolated cytoplasm. The differential diagnosis includes a number of other neoplastic processes. Separation of clear-cell meningioma from these other entities may be difficult because of its rather unusual cytoplasmic features and its occurrence in unusual sites.

Adult↗
PubMed1997

Atypical glandular cells of undetermined significance. Diagnostic accuracy and interobserver variability using select cytologic criteria.

Histologic follow-up of patients with the Bethesda system cervical-vaginal diagnosis of atypical glandular cells of undetermined significance (AGUS), "favor endocervical origin", or "not otherwise specified" (NOS) shows a high percentage of clinically significant (neoplastic or preneoplastic) lesions. Using the criteria of atypical single cells, irregular nuclear membranes, and decreased cytoplasm, eight observers retrospectively reclassified 88 AGUS, "favor endocervical", or NOS smears using a probabilistic scheme. Follow-up showed 46 clinically significant and 42 benign lesions. The mean accuracy for all observers and the experienced observers was 65% and 72%, respectively. For the experienced observers, the mean specificity of a "favor clinically significant" category was 72%; the mean sensitivity of a "favor benign" category was 90%. For the less experienced observers, subclassification had poor predictive value. We conclude that experienced observers may use specific criteria to correctly subclassify AGUS lesions, and this may aid in patient management.

Female↗
PubMed1997

Telepathologic review: utility, diagnostic accuracy, and interobserver variability on a difficult case consultation service.

The diagnostic accuracy of telepathologic analysis has not been compared to that of conventional light microscopic review on a difficult case consultation service. The anatomic pathology consultation files of the University of Iowa were retrospectively examined, and 105 difficult cases from a variety of organs were chosen for real-time telepathologic and light microscopic review. The telepathologic and light microscopic crude agreement of five pathologists were compared, with use of the original consultation diagnosis as the "gold standard." Cases were scored as correct, partially correct, or incorrect. After making a video diagnosis, the pathologists reported whether they wanted to review the case with use of a light microscope. The pathologists performed significantly better with the light microscope, even after excluding cases in areas of inexpertise (P = .005). The mean percentage of cases that the pathologists wanted to review with the light microscope was 64%, and the major reason for review was diagnostic uncertainty. Cases incorrectly diagnosed with use of the video monitor were almost always requested for review. We conclude that, on a difficult case consultation service, pathologists perform significantly better with use of light microscopic than with telepathologic analysis; rarely make an incorrect diagnosis and do not request that case for light microscopic review; and exhibit high telepathologic diagnostic accuracy in areas of expertise.

Adolescent↗
PubMed1994

Gastrointestinal tattoos.

Tattooing of the gastrointestinal tract is used to facilitate the relocation of biopsy sites or other sites of interest at the time of subsequent biopsy or surgery. Submucosal injection of sterile india ink produces a zone of blue-black coloration that is grossly visible from both the mucosal and serosal surfaces. The pathology of gastrointestinal tattoos has only been briefly mentioned previously in the medical literature. We report two cases of gastrointestinal tattooing: one that was done to mark the margin of resection in a patient with gastric lymphoma, and the second that occurred unintentionally following the administration of activated charcoal for drug overdosage in a patient with undiagnosed active inflammatory bowel disease. Unintentional tattooing of the gastrointestinal tract has, therefore, not been reported.

Adult↗
PubMed1992

Toxicity of a family from vacuumed mercury.

A family of four developed toxic blood levels of mercury after the mother vacuumed a spilled jar of liquid mercury from a closet in their apartment. The youngest son developed severe thrombocytopenia which was initially diagnosed as idiopathic thrombocytopenic purpura secondary to viral illness. A possible association between acute mercury toxicity and idiopathic thrombocytopenic purpura has not been previously reported. Chelation therapy with penicillamine for the older child was administered soon after toxic blood mercury levels were known by the physician. Because thrombocytopenia has been reported to occur in up to 5% of patients receiving penicillamine therapy, the younger child was treated with dimercaptosuccinic acid. The mother was also treated with dimercaptosuccinic acid. The father received dimercaprol therapy. The toxic effects and rationale for now outdated therapeutic uses of mercury are discussed.

Adult↗