Biomedical subjects

C P Molina

Publications and source records attributed to C P Molina.

10 recordsLinked to original sources

PubMed2001

Fine-needle aspiration cytology and core biopsy of malignant peripheral nerve sheath tumor of the uterus: a case report.

Malignant peripheral nerve sheath tumor (MPNST) is an uncommon mesenchymal neoplasm of neural origin. MPNST arising in the uterus is extremely rare. Its histologic appearance on this anatomical location has been only rarely reported. A 62-yr-old woman with a previous history of partial hysterectomy presented with a large pelvic mass in the uterine stump. Fine-needle aspiration (FNA) and core biopsy were obtained under ultrasonographic guidance, and the diagnosis of MPNST was established. The cytologic and histologic findings were consistent with a spindle-cell neoplasm suggestive of MPNST. The tumor cells were focally positive for S-100 protein immunostain, thus providing further support for the neoplasm's nerve sheath differentiation. The patient had no history of von Recklinghausen's disease. Resection of the mass confirmed the diagnosis of MPNST. To our knowledge, the FNA cytology of MPNST in this unusual location has not been previously reported. FNA cytology, along with core biopsy and immunochemistry, is a reliable tool in the diagnosis of MPNST.

Biopsy, Needle↗

PubMed2000

Diagnosis of recurrent uterine carcinosarcoma by fine-needle aspiration cytology: report of a case.

Uterine carcinosarcomas are uncommon, aggressive neoplasms usually afflicting postmenopausal women. Histologically, they are characterized by the presence of both malignant epithelial and stromal cells. The latter may be either homologous or heterologous in nature. The cytologic diagnosis of carcinosarcoma via fine-needle aspiration (FNA) was previously described for primary tumors arising in the parotid gland, breast, lung, and ovary. Although the diagnosis of uterine carcinosarcoma via cervicovaginal, endometrial, and peritoneal fluid cytology has been described, the FNA cytology diagnosis of recurrent uterine carcinosarcoma has only been rarely described. We present a case of recurrent uterine carcinosarcoma in a 59-yr-old woman, diagnosed by ultrasound-guided FNA cytology. Cytologic smears showed a biphasic neoplasm consisting of both malignant columnar epithelial and spindle cells, in a background of tumor diathesis. This case illustrates the diagnostic utility of aspiration cytology in the investigation of recurrent carcinosarcoma in clinically suspicious lesions arising postsurgery.

Biopsy, Needle↗

PubMed2000

Herpes simplex viral laryngitis.

The true incidence of herpetic infections of the larynx is unknown. This entity may be underreported because of the difficulty in establishing the diagnosis. This report describes an immune-competent patient in whom extubation failed because of mass lesions of the posterior glottis. A biopsy specimen of the lesions revealed herpes simplex virus. We review the clinical presentation and histopathologic findings in this patient.

Biopsy↗

PubMed2000

Marked increase in L-selectin-negative T cells in neonatal pertussis. The lymphocytosis explained?

The detailed immunophenotype of peripheral blood lymphocytes from a neonate with pertussis was determined by flow cytometry and compared with results from cord blood from healthy newborns. Most (72%) of the lymphocytes were CD3+ T cells with a normal CD4/CD8 ratio (2.5). The T cells were largely HLA-DR negative and CD45RA+, consistent with unstimulated naïve T cells. Almost all of the CD4+ T cells were Leu8 (L-selectin, CD62L) negative, while almost all of the CD8+ T cells were CD28+. There was no increase in CD7- CD4+ T cells (Th2-like). No relative increase in CD16/56+ NK cells (5%) or CD19/20+ B cells was seen. The most dramatic finding in this case was the remarkable lack of expression of L-selectin by the T cells. L-selectin expression is associated with homing of peripheral blood lymphocytes to lymph nodes. The dramatic reduction in L-selectin expression of the T lymphocytes in pertussis, perhaps induced by pertussis toxin, likely prevents homing of the T cells to peripheral lymphoid tissues and provides a likely explanation for the marked lymphocytosis noted in this disease.

Antigens, CD↗

PubMed2000

The pathologic spectrum of gastrointestinal and hepatic histoplasmosis.

We characterized the pathologic spectrum of lesions in gastrointestinal and hepatic histoplasmosis by studying cases of disseminated disease in immunocompromised and immunocompetent patients from endemic and nonendemic areas. We evaluated 56 specimens from 52 patients with H&E and silver stains. Of these patients, 43% presented with gastrointestinal rather than pulmonary symptoms. Thirty-one percent had gastrointestinal lesions, 10% had liver lesions, and 43% had both. Gross gastrointestinal features included ulcers (49% of patients), nodules (21%), hemorrhage (13%), obstructive masses (6%) and normal mucosa (23%). Microscopic gastrointestinal findings included diffuse lymphohistiocytic infiltration (83%), ulceration (45%), lymphohistiocytic nodules (25%), or minimal inflammatory reaction (15%) but only rare well-formed granulomas (8.5%). The most common hepatic finding was portal lymphohistiocytic inflammation; discrete hepatic granulomas were seen in less than 20% of involved livers. The pathologist must be aware of the broad range of gastrointestinal and hepatic lesions produced by histoplasmosis and, in particular, that well-formed granulomas are rare. Given the appropriate clinical context, histoplasmosis should be considered in both immunocompetent and immunocompromised patients, regardless of pulmonary symptoms, in nonendemic as well as endemic areas.

Adolescent↗

PubMed2000

Analysis of false-negative diagnoses on endoscopic brush cytology of biliary and pancreatic duct strictures: the experience at 2 university hospitals.

CONTEXT: Endoscopic brush cytology is a valuable technique for the diagnosis of pancreatobiliary malignancy. Despite its widespread use, the sensitivity of this method has been reported as approximately 50%. The specificity is usually higher than 95%. Few reports have systematically analyzed the reasons for this relatively low sensitivity. OBJECTIVES: To determine the rate and reasons for false-negative diagnoses in endoscopic brushing cytology of biliary and pancreatic ducts based on the results of sensitivity, specificity, accuracy, and positive and negative predictive values. DESIGN: Retrospective analysis of laboratory data and slide review of false-negative cases. SETTING: Two tertiary care state university hospitals. PATIENTS: A total of 183 pancreatobiliary brushing specimens obtained from patients undergoing endoscopic retrograde cholangiopancreatography for biliary or pancreatic duct disease for a 4- to 5-year period. INTERVENTION: Endoscopic retrograde cholangiopancreatography brushings. MAIN OUTCOME MEASURES: Determination of sensitivity, specificity, accuracy, and positive and negative predictive values. Analysis of false-negative results. RESULTS: The sensitivity, specificity, accuracy, and positive and negative predictive values, overall, were 48%, 98%, 79%, 92%, and 76%, respectively. Sampling error was a major cause of false-negative diagnoses (67%), followed by interpretive (17%) and technical errors (17%). CONCLUSIONS: Improvements in sensitivity and diagnostic accuracy for cancer of the pancreatobiliary tract can be achieved by optimizing slide preparatory techniques. Also, enhancement of the cytologist's diagnostic skills enables the identification of the morphologic features of premalignant lesions. Repeat brushings are indicated for suspicious or negative results not consistent with the clinical or radiologic findings.

Bile Duct Diseases↗

PubMed2000

Case report. Intestinal infarction due to vascular catastrophe in an HIV-infected patient.

A 40-year-old HIV-infected woman developed nausea, vomiting, and epigastric pain and died following her third dose (per study protocol) of interleukin (IL)-2. Her HIV infection was diagnosed in 1996. Her last CD4 cell count was 390/microL, and her viral load was negligible (as of November 28, 1998). She had no known general risk factors for thrombosis other than HIV infection, injection drug abuse, and antiretroviral therapy with indinavir. Abdominal films showed no sign of mechanical obstruction but a generalized gas distention of the bowel, which was suggestive of paralytic ileus. Autopsy revealed dilation of the small bowel with extensive necrosis and hemorrhage involving all the segments. The superior and inferior mesenteric arteries revealed severe atherosclerosis. The stenotic celiac artery was occluded by a recent thrombus at the aortic ostium. Clinicians need to be aware of the potential for thrombosis and accelerated atherosclerosis in HIV-infected patients. Both injection drug abuse and protease inhibitors, such as indinavir, have been shown to be risk factors for thrombosis. However, it is likely IL-2 contributed to the severe thrombosis in this patient, although definitive proof is lacking. An acute awareness of intestinal infarction in HIV-infected patients is warranted.

Adult↗

PubMed1999

Microcystic adenoma of the pancreas: cytologic appearance on percutaneous and endoscopic ultrasound-guided fine-needle aspiration: report of a case.

Microcystic adenoma is an uncommon neoplasm of the pancreas usually affecting older people. Its histologic features have been well characterized. The cytologic appearance of this tumor has been described only rarely, however, Microcystic adenomas may enlarge considerably and often produce symptoms related to their compression to adjacent anatomic structures. The fact that this neoplasm is almost always benign indicates the need for accurate preoperative diagnosis to differentiate it from other, more common, malignant or potentially malignant tumors of the pancreas. We present a case of pancreatic microcystic adenoma initially diagnosed by percutaneous image-guided fine-needle aspiration cytologic examination and core biopsy and further evaluated by endoscopic ultrasound-guided fine-needle aspiration on follow-up. This case report illustrates that microcystic adenoma of the pancreas can be accurately diagnosed by aspiration cytology. Fine-needle aspiration--percutaneous, guided by computerized tomography, or endoscopically guided by ultrasonography--constitutes a reliable and cost-efficient diagnostic tool associated with minimal trauma to the patient.

Adenoma↗

PubMed1999

Case of the month: January 1999--Fetus with echogenic mass in third ventricle.

A 29-week gestational age newborn male infant was found to have an echogenic mass in the 3rd ventricle by prenatal ultrasound 2 weeks prior to delivery. At delivery he was poorly responsive and had hydrocephalus and ascites. A CT scan after birth showed cerebral infarction, amorphous tissue in the left hemisphere and numerous calcifications. Despite supportive treatment he died 4 days after birth. Postmortem examination of the brain revealed marked distortion of the architecture and a supratentorial undifferentiated neoplasm consistent with a PNET. The tumor showed extensive areas of hemorrhage and necrosis and involvement of lateral and third ventricles, brain parenchyma, and meninges.

Brain Neoplasms↗

PubMedDate not supplied

Anitschkow nuclear changes in postmortem pericardial scrapings.

OBJECTIVE: To document the presence of Anitschkow nuclear changes (ANC) in pericardial mesothelium at autopsy after the incidental finding of ANC in pericardial scrapings from a fatal case of overwhelming sepsis. STUDY DESIGN: Fourteen, nonconsecutive autopsy cases were studied. Using the edge of a scalpel, the visceral pericardium from the left ventricle was scraped, and the sample was smeared onto glass slides, fixed in 95% ethanol, Papanicolaou stained and evaluated for the presence of ANC. Histologic correlation was also performed. RESULTS: ANC were observed in pericardial mesothelial cells in 6 of 14 cases. Sepsis was the cause of death in three. Fatal cardiac arrhythmia, T-cell lymphoma and fulminant hepatic necrosis were found in the remaining cases. While readily seen in cytologic preparations, ANC were found focally in only one case examined histologically. CONCLUSION: Postmortem cytologic evaluation provides information relevant to the autopsy. In this study, ANC were very clearly seen in six pericardial scrapings. Clinical correlation supports the current theory that ANC represent a nonspecific reactive cell change.

Adult↗