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P Kaudewitz

Publications and source records attributed to P Kaudewitz.

At least 19 recordsLinked to original sources
PubMed2001

Xanthelasma palpebrarum: treatment with the erbium:YAG laser.

BACKGROUND AND OBJECTIVE: Xanthelasma palpebrarum presents a therapeutic and aesthetic challenge because of its high visibility and frequent rate of recurrence with a wide variety of treatments. Many patients are disappointed by an initial unsuccessful treatment and fail to return for further therapy until the skin problem has become quite conspicuous. A simple treatment with few side effects and good acceptance remains an important goal. STUDY DESIGN/MATERIALS AND METHODS: Fifteen patients with a total of 33 xanthelasma lesions, were treated by an erbium:YAG laser. The follow-up period of observation was between seven and twelve months. RESULTS: All lesions were removed without hyperpigmentation or scarring. CONCLUSIONS: The erbium:YAG laser represents an effective means for treating xanthelasmas with few side effects.

Adult↗
PubMed2001

Follicular mycosis fungoides. A histopathologic analysis of nine cases.

BACKGROUND: The spectrum of mycosis fungoides is exceedingly broad. Many different variants have been described, based on both clinical appearance and histological pattern. A rare form which shows preferential infiltration of hair follicles by malignant lymphocytes is follicular mycosis fungoides. METHODS: We reviewed our experience with nine cases of follicular mycosis fungoides. RESULTS: The unifying feature was infiltration of the hair follicle epithelium by atypical lymphocytes causing varying degrees of damage to the hair follicles. In some specimens the lymphocytes displayed only minor atypia leading to a misinterpretation as pseudolymphoma. Gene rearrangement studies were particularly helpful for establishing a diagnosis of malignant lymphoma. Additionally, epidermotropism of lymphocytes, eosinophils and mucin deposition were present to varying degrees. Mucin makes the distinction from mycosis fungoides-associated follicular mucinosis difficult. We found both dermal mucin and a follicular mucinosis pattern present at different stages of disease in the same patient. CONCLUSIONS: We suggest the term mycosis fungoides-associated follicular mucinosis should be replaced by follicular mycosis fungoides in future lymphoma classification schemes.

Aged↗
PubMed2001

Effective treatment of leg vein telangiectasia with a new 940 nm diode laser.

BACKGROUND: A variety of lasers have been used in an attempt to treat leg vein telangiectasia OBJECTIVE: To evaluate the feasibility of a new 940 nm diode laser for the treatment of leg vein telangiectasia. METHODS: Thirty-one patients with leg vein telangiectasia were treated with a diode laser; 26 of these with 940 nm, 300-350 J/cm2, 40-70 msec, 1.0 mm handpiece, one pass, and 5 of these with 940 nm, 815 J/cm2, 50 msec, 0.5 mm handpiece, one pass. Each subject had three treatments of the same site at 4-week intervals. Photographs taken before and 4 weeks after the last treatment were evaluated by two independent observers for vessel clearance. RESULTS: In those 26 patients treated with a fluence of 300-350 J/cm2, a vessel clearance of greater than 50% was achieved in 20 patients (76%), 12 of these patients had clearance rates greater than 75%. A clearance rate of less than 50% was obtained in six patients, with three of these patients showing responses of less than 25%. In five patients treated with a fluence of 815 J/cm2 a clearance rate of more than 75% was observed. CONCLUSIONS: In this preliminary study a 940 nm diode laser was shown to be safe and effective for the treatment of leg vein telangiectasia.

Feasibility Studies↗
PubMed2000

Large plaque parapsoriasis: clinical and genotypic correlations.

Twelve patients with large plaque parapsoriasis (LPP) were investigated for the presence of predominant T-cell clones, analyzing the T-cell receptor (TCR) gamma-chain gene. The diagnostic and prognostic significance of TCR gene rearrangement status was assessed by a correlation with the long-term clinical follow-up. Six out of 12 patients showed a clonal T-cell population. Clinically, among the patients with clonal disease one developed clearcut mycosis fungoides (MF) after a follow-up of 8 years, in the other 5 patients no such diagnosis could be made after follow-up of 2-21 years (median: 9 years). In patients with polyclonal infiltrates the lesions remained virtually unchanged. These findings indicate that in LPP TCR gene rearrangement status has no prognostic significance and does not allow distinction of LPP and early MF. Both conditions show a clonal T-cell infiltrate with similar frequency, are very similar in clinical and histologic presentation and according to recent studies share the same low risk to develop overt MF. Therefore both terms refer to the identical clinical situation. This should be designated as early MF and efforts should concentrate on identifying those patients that are at risk to develop aggressive disease.

Adult↗
PubMed2000

Fractionated radiotherapy of lentigo maligna and lentigo maligna melanoma in 64 patients.

Between 1987 and 1998, 64 patients with lentigo maligna (LM) (n = 42) or lentigo maligna melanoma (LMM) (n = 22) were treated by fractionated radiotherapy. In all 22 patients with LMM, excision of the nodular part of the LMM was performed before radiation of the residual lentiginous tumor. During the follow-up period of 1 to 96 months (mean, 23 months; median, 15 months), none of the 42 patients with LM displayed any signs of recurrence of LM after radiation therapy alone. Of the 22 patients with LMM, only 2 patients showed local recurrence of the tumor, salvaged by excision in both cases. One patient with LMM suffered from metastatic disease without local recurrence of the melanoma 44 months after radiation therapy. The cosmetic results of radiotherapy were good or excellent in the vast majority of patients, with only a few experiencing hypopigmentation or hyperpigmentation in the irradiated area. Fractionated radiation therapy with superficial x-rays is an effective method of treatment of LM associated with low morbidity and leading to clinical results comparable to those of surgical excision.

Aged↗
PubMed2000

An unusual cutaneous T cell lymphoma presenting as leonine facies.

We report an unusual case of a cutaneous T cell lymphoma with the clinical picture of leonine facies as the only skin symptom appearing during the first years of the disease. Small atypical lymphocytes with partly pleomorphic, partly indented cerebriform nuclei are present in the facial skin as well as in the peripheral blood and in the bone marrow. The lymphoma shows an indolent clinical behaviour without rapid progression of the disease. It shares features with both pleomorphic small/medium-sized T cell lymphoma and mycosis fungoides, but cannot be classified according to the criteria of the European Organization for Research and Treatment of Cancer (EORTC) Classification for Primary Cutaneous Lymphomas. At present the lymphoma has to be ranged among the group of so-called unspecified peripheral T cell lymphomas according to the proposal of the International Lymphoma Study Group.

Biopsy↗
PubMed1999

The revised European-American Classification of Lymphoid Neoplasms (REAL): a preferred approach for the classification of cutaneous lymphomas.

The Revised European-American Classification of Lymphoid Neoplasms (REAL) classification is based on the principle that each type of lymphoma is a distinct disease defined by morphology, immunophenotypic and genetic features, clinical presentation, and course. If either primary or secondary involvement of the skin is a constant factor, this aspect is considered integral to disease definition. Organ-specific classification schemes, such as that proposed by the European Organization for Research and Treatment of Cancer (EORTC) for cutaneous lymphomas, are not required, and indeed may impede the recognition of common features of diseases involving multiple anatomic sites. The use of multiple classification systems is a step backward, and may lead to confusion among hematologists/oncologists and dermatologists. Nevertheless, cutaneous lymphomas in many instances are distinct. Their natural history is often more indolent than nodal lymphomas, and for that reason they often require different therapeutic approaches. We agree with the efforts of the EORTC classification to emphasize the unique clinical aspects of many cutaneous lymphomas, as this recognition is essential for appropriate clinical management. As has been learned for nodal lymphomas, clinical features play an important role in prognosis and should be used in guiding therapy. For cutaneous lymphomas, the presence or absence of systemic spread is particularly important.

Hodgkin Disease↗
PubMed1998

[Basalioma].

Explore the source record for details and available documents.

Basal Cell Carcinoma↗
PubMed1998

Automated high-resolution polymerase chain reaction fragment analysis: a method for detecting T-cell receptor gamma-chain gene rearrangements in lymphoproliferative diseases.

Southern blot analysis and the polymerase chain reaction (PCR) are powerful tools for detecting clonal antigen receptor gene rearrangements. However, a number of limitations restrict the predictive value of the results obtained by these techniques as they are commonly used. We describe a new method, automated high-resolution PCR fragment analysis, that can partially overcome many of the limitations of analyzing the T-cell receptor (TCR) gamma-chain gene. Analysis of TCR-gamma is performed using PCR with four sets of primers, previously described by others, specific for all variable (V) and joining (J) regions of the TCR gamma-chain gene. In addition, the four V region primers are 5' end-labeled with a fluorescent compound, 5-carboxyfluorescein. After amplification, the labeled PCR products are separated with an automated sequencing system, ABI 373 (Applied Biosystems, Weiterstadt, Germany). With the help of the Gene-Scan software ABI 672 (Applied Biosystems) and fluorescent-labeled DNA length markers, the exact size of each peak can be displayed and analyzed. The resolution of this method allows separation of PCR products differing in length by as little as 1 bp. Semiquantitative estimation of specific clones also can be performed. Infiltrate-specific gene rearrangement patterns can be identified and recognized in different tissue specimens at the time of diagnosis or in subsequent biopsy specimens. We conclude that automated high-resolution PCR fragment analysis allows more accurate and convenient analysis of the TCR gamma-chain gene.

Automation↗
PubMed1997

Trichoblastoma and basal cell carcinoma are neoplasms with follicular differentiation sharing the same profile of cytokeratin intermediate filaments.

Trichoblastoma and nodular basal cell carcinoma are generally held to be distinctive epithelial neoplasms with some overlapping features. We investigated 30 trichoblastomas in which the basaloid cells expressed cytokeratins (CK) CK5/6, CK14, CK17, CK19, and, in a few cells, vimentin. The cells of the periphery of small and large cysts showed the same profile. Cells lining the lumen of small cysts expressed CK14, CK17, and involucrin, and those in larger cysts showed a positivity for CK1, CK4, CK10, CK14, CK17, and involucrin. The remaining tested antibodies (CK7, CK8, CK13, CK18, CK20, alpha-smooth-muscle actin) were negative in all cases. The cells of the stroma expressed vimentin and in 22 cases, the CD34 antigen. Seventeen nodular basal cell carcinomas showed exactly the same staining pattern. Furthermore, there are striking immunohistochemical similarities between the neoplastic basaloid cells of both neoplasms and the cells of the hair germ. Therefore, trichoblastoma and nodular basal cell carcinoma cannot be distinguished by their pattern of cytokeratin expression in paraffin sections. The virtually identical cytokeratin pattern seen in trichoblastoma, basal cell carcinoma, and the developing fetal hair follicle is compelling evidence for common differentiation pathway.

Actins↗
PubMed1997

The Revised European-American Classification of Lymphoid Neoplasms (REAL): a new perspective for the classification of cutaneous lymphomas.

Differing classification schemes for malignant lymphomas have been used in Europe and the United States. Attempts to translate between the principle classifications have been unsuccessful and historically it has been difficult to arrive at an unified approach. In addition, many new lymphoma entities have been recognized in recent years that are not delineated in any of the existing classification schemes. To provide a unified international basis for clinical and investigative work in this field, in 1994 the International Lymphoma Study Group (ILSG) proposed a new classification termed Revised European-American Classification of Lymphoid Neoplasms (REAL). This review discusses the REAL classification, especially as it pertains to cutaneous lymphomas, and provides insight into the clinicopathologic features of lymphoproliferative disease involving the skin. The premise of the REAL classification is that a classification scheme should be based on the delineation of disease entities, utilizing pathologic, immunophenotypic, genetic, and clinical features. Therefore, if cutaneous involvement is an integral aspect of any lymphoma subtype, this clinical information is included in the definition of that neoplasm. We conclude that the principles of the REAL classification are applicable to cutaneous lymphomas, as well as lymphomas involving other anatomic sites.

Humans↗
PubMed1997

Absence of anaplastic lymphoma kinase (ALK) and Epstein-Barr virus gene products in primary cutaneous anaplastic large cell lymphoma and lymphomatoid papulosis.

The prevalence of the t(2;5)(p23;q35) and/or anaplastic lymphoma kinase (ALK) gene products in cutaneous anaplastic large cell (ALC) lymphomas and a potential precursor lesion, lymphomatoid papulosis (LyP), is controversial. ALK gene products, which are absent from normal lymphohaematopoietic cells, are a phenotypic marker of lymphomas carrying the t(2;5). We used in situ hybridization and immunohistology to screen 14 cutaneous ALC lymphomas, 21 cases of LyP, and one nodal ALC lymphoma associated with LyP for ALK gene products. ALK gene products were not detectable in these cases. In contrast, ALK gene products were found in a lymphonodal ALC lymphoma with subsequent extension to the skin and in t(2;5)-positive cell lines. Detection of the Epstein-Barr virus (EBV)-encoded small nuclear transcripts (EBER), and of immunoglobulin light chain transcripts served to check for the presence of cellular RNA in the tissue sections. EBER transcripts were found in scattered reactive lymphoid cells, but not in atypical or tumour cells. ALK gene expression and EBV infection seem to be a rare finding in cutaneous ALC lymphomas and LyP. This points to a molecular aetiology of primary cutaneous ALC lymphomas and LyP distinct from that of extracutaneous CD30+ lymphoproliferative disease. Detection of the t(2;5) or ALK gene products in cutaneous lymphoproliferative lesions therefore requires exclusion of extracutaneous ALC lymphoma in such patients.

Anaplastic Lymphoma Kinase↗
PubMed1996

[Detection of clonality of cutaneous T-cell lymphomas using polymerase chain reaction].

Differentiation of a cutaneous lymphoma from a reactive lymphoid infiltrate is a demanding challenge for the pathologist. In this retrospective study we examined 24 paraffin-embedded tissue samples from lesions diagnosed as lymphomas and 7 control samples of skin affected by benign changes and with pronounced lymphoid infiltrates for clonal rearrangement of the gamma T-cell-receptor. Using PCR technology we demonstrated clonality in 22 cases of lymphoma (92%). Thus, the primer combination used in this study covering the four main groups (I-IV) of the variable region of the gamma T-cell receptor gene allows high sensitivity. No clonality was demonstrable in any of the 7 control cases. This study demonstrates the growing importance of PCR technology for the diagnosis of lymphoma.

Cell Transformation, Neoplastic↗
PubMed1996

T-cell-rich B-cell lymphoma presenting in skin. A clinicopathologic analysis of six cases.

We reviewed our experience with six T-cell-rich B-cell lymphomas (TRBL) presenting in skin. Immunohistochemical studies were performed on all biopsies. The lymphoid population consisted mainly of CD3 and/or UCHL-1 (CD45RO) positive T cells. 5 to 15% of the lymphoid cells stained for the B-cell marker L26 (CD20). Monoclonality of the B-cell component was demonstrated in all cases, utilizing either light chain restriction (5 cases) or clonal immunoglobulin heavy chain gene rearrangement by polymerase chain reaction (PCR) (2 cases). One case was confirmed to be monoclonal by both techniques. Additionally, no clonal rearrangements of the T-cell receptor gamma gene were observed. There was considerable morphological variety in these cases. In H&E stained sections, the differential diagnosis included pseudolymphoma, peripheral T-cell lymphoma, Hodgkin's disease, Lennert's lymphoma and a MALT lymphoma. A significant component of monoclonal plasma cells was present in 3 of 6 cases, suggesting a possible origin from cutaneous immunocytoma. In fact, one of our cases was a biphasic lymphoma displaying TRBL with a small focus of immunocytoma. We conclude that immunophenotypic analysis is necessary for the diagnosis of TRBL. Pathologists should be aware of this type of cutaneous B-cell lymphoma to avoid misinterpretation as a pseudolymphoma.

Adult↗