Biomedical subjects

K Rhinow

Publications and source records attributed to K Rhinow.

3 recordsLinked to original sources

PubMed2006

[Oral EBV-associated diffuse large B-cell lymphomas in HIV-negative immunocompromised patients].

BACKGROUND: Diffuse large B-cell lymphomas (DLBCL) are non-Hodgkin's lymphomas (NHL) and with a prevalence of 30-40% they comprise the most frequent NHL in adults. Although their etiology is still unknown, a virus induction, especially by the Epstein-Barr-virus (EBV), is the subject of discussion. Patients with congenital or acquired immunodeficiency are primarily afflicted. PATIENT 1: A 39-year-old female patient developed an EBV-associated DLBCL of the plasmablastic subtype in the maxillary alveolar ridge in the region of teeth 11 and 21 after 24 years of immunosuppressive therapy with azathioprine due to myasthenia gravis. Clinically the lesion presented as a localized acute necrotizing periodontitis that was resistant to symptomatic therapy. After polychemotherapy the disease is in complete remission until today. PATIENT 2: A 56-year-old male patient developed an EBV-associated DLBCL of immunoblastic variant of the right maxillary edentulous alveolar ridge in the posterior region 7 weeks after heart transplantation and immunosuppressive therapy with azathioprine and cyclosporine A. Clinically, a soft, nonpainful, swelling measuring 1.5x0.5x0.5 cm with a central ulceration was evident. The tumor was excised followed by local radiation therapy. No recurrence was noted during a 15-year-follow-up. DISCUSSION: The presented clinical cases demonstrate the increased risk of occurrence of oral malignant B-cell lymphomas as adverse effects of immunosuppressive therapy. The demonstration of EBV in the tumor cells in both cases underlines the involvement of this virus in the pathogenesis of oral DLBCL arising in the setting of an immunodeficiency as has been shown previously in patients with HIV. CONCLUSIONS: Due to the varying and often nonspecific clinical appearance of oral DLBCL, an early biopsy and work-up by an institute specialized in hematopathology is essential for diagnosis, because these tumors may disseminate in early stages.

Adult↗

PubMed2003

[Quantitative determination of CMV-DNA in saliva of patients with bone marrow and stem cell transplantation using TaqMan-PCR].

BACKGROUND: Human cytomegalovirus (HCMV) infection is associated with severe and life-threatening diseases in immunocompromised patients, especially after bone marrow (BM) and stem cell (SC) transplantation. Prior to transplantation the potential risk of HCMV disease is therefore determined by HCMV-antibody blood testing of transplant donor (D) and recipient (R). Virus carriers are positive for anti-CMV-IgG. Virus patterns are distinguished as follows: group 1 (D+/R+), group 2 (D-/R+), group 3 (D+/R-), and group 4 (D-/R-). AIM: The aim of this study was qualitative and quantitative determination of the HCMV DNA load in saliva of BM and SC transplantation patients. PATIENTS AND METHOD: Unstimulated saliva was collected from 20 patients prior to BM and SC transplantation, during the time of conditioning, and after transplantation. DNA was isolated and analyzed for evidence of HCMV DNA with TaqMan PCR. RESULTS: HCMV DNA was isolated in seven cases. In all group 1 patients (D+/R+) HCMV DNA could be demonstrated. Only three of seven group 2 patients (D-/R+) were positive for HCMV DNA. The only group 3 patient (D+/R-) and all eight group 4 patients (D-/R-) were negative. CONCLUSION: TaqMan PCR is a reliable method for HCMV DNA quantification. In three patients (anti-HCMV-IgG positive) who received an anti-CMV-IgG negative transplant HCMV DNA was isolated. In contrast, no HCMV-DNA was evident in HCMV-negative patients who received an HCMV-negative transplant. Accordingly, the risk of HCMV reactivation is more probable than the risk of reinfection.

Adult↗

PubMed2002

[Verruciform xanthoma].

BACKGROUND: Verruciform xanthoma (VX), a rare, benign lesion of the skin and mucosa, is slow-growing, asymptomatic and characterized by a granular (verruciform) surface. It is yellowish-red or grey in color and up to 2 cm in diameter. Histologically, a papillary and/or verrucous proliferation of the squamous epithelium with hyperparakeratosis and numerous foam cells is present. These cells are predominantly located within the papillae of the lamina propria. For differential diagnosis, other papillomatous and verrucous lesions such as verrucous carcinomas or squamous cell carcinomas need to be ruled out. CASE REPORT: A 46-year-old patient with VX located on the alveolar process regio 26-28 is presented. Clinically, a 2 x 2 cm granular, oral mucosa surface lesion extending onto the palate occurred in regio 26-28. Biopsy was characterized light microscopically by the presence of swollen, elongated cells in the submucosa, an indication of VX alterations. Transmission electron microscopy demonstrated foam cells in the subepithelium containing numerous membrane-bound vesicles similar in diameter and showing a wide variation in electron density. Morphologically, these cells resembled macrophage-related cells. The lesion was excised in total with no evidence of recurrence after 9 months. DISCUSSION: The pathogenesis of VX is still unclear. The characteristic xanthoma cells may play a major role in VX. Microscopic analysis of the morphology of the foam cells indicated that they may represent a differentiated form of macrophages. Lipid vesicles inside these cells differed in their electron density indicating a heterogeneous biochemistry or different states of maturation.

Alveolar Process↗