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Biomedical subjects

C Langner

Publications and source records attributed to C Langner.

26 records · Page 2Linked to original sources
PubMed2001

[Diffuse hemangiomatosis of the liver and spleen in an adult].

Diffuse hemangiomatoses are extremely rare in adults. The etiology and natural history of the disease are not well understood. A case of diffuse hemangiomatosis of the liver and spleen associated with progressive liver failure, thrombocytopenia, and disturbance of blood coagulation (comparable to Kasabach-Merritt syndrome) is presented in a 62-year-old male. We describe the histopathological and immunohistochemical findings and illustrate the morphological aspects of differential diagnosis, distinguishing the disease from other vascular proliferations.

Biopsy↗
PubMed2001

Piffalls in diagnostic molecular pathology--significance of sampling error.

Today, molecular diagnostic tests are widely used in clinical medicine with polymerase chain reaction (PCR)-based techniques being of particular interest. In tissue specimens, however, false-positive and false-negative results can be obtained if pathomorphological and processing aspects are not considered. We therefore studied the impact of tissue sampling in three widely used diagnostic tests: (1) assessment of clonality in B-cell non-Hodgkin's lymphoma, (2) analysis of microsatellite instability (MSI) in colorectal neoplasia, and (3) demonstration of mycobacterium tuberculosis. Tissue sections of routinely formalin-fixed and paraffin-embedded diagnostic specimens were taken, and the significance of sampling was systematically investigated using laser microdissection or processing of the entire section. PCR analyses were done according to standard protocols. False-positive pseudo-monoclonality was obtained in small gastrointestinal biopsies and in laser microdissected lymph follicles of non-neoplastic tonsils. False negativity (pseudo-stability) could be demonstrated in a case with hereditary rectal adenoma if whole tissue sections were taken without microdissection of the most dysplastic subareas. Demonstration of mycobacteria failed in tissue sections of a formalin-fixed lymph node that was positive after complete digestion or in fresh frozen material of the same patient. In diagnostic molecular pathology, sampling error is an important source of false-positive and false-negative results, particularly if disease- and tissue-specific morphological features, such as sample size, type of fixation, and intralesional heterogeneity, are ignored.

Clone Cells↗
PubMed2000

Linear atrophoderma of Moulin.

We report a typical case of linear atrophoderma of Moulin that represents a distinct clinical entity. A 17-year-old woman presented with hyperpigmented and atrophic band-like skin lesions measuring 3-5 cm in breadth on the right side of her trunk and on the right buttock, in an arrangement following the system of Blaschko's lines. The skin lesions had a normal texture and showed no signs of inflammation, lilac ring, erythema, induration, sclerosis or depigmentation. Routine laboratory data were normal. Antinuclear antibodies and anti-Scl70-antibodies were negative. Histopathologically, a moderate diffuse hyperpigmentation within the lower epidermis, a focal vacuolar degeneration of the basal layer, and a few dermal perivascular lymphocytes accompanied by signs of pigment incontinence were noted. Intravenous penicillin G was administered for 14 days in a dosage of 10 x 10(6) IU twice daily. This treatment was repeated after 3 and 9 months. No effect was noted. Linear atrophoderma of Moulin takes a chronic course without progression or regression. The disease leads to significant cosmetic impairment and this may cause emotional stress. Due to its relationship to idiopathic atrophoderma of Pierini-Pasini and linear scleroderma, treatment with intravenous penicillin was tried. In our case it had no effect.

Adolescent↗
PubMed1999

[Squamous cell carcinoma developing from epidermodysplasia verruciformis].

We report on a 50-year-old man who presented with squamous cell carcinoma of the forehead skin developing from epidermodysplasia verruciformis (EV). EV is an uncommon disease characterized by flat warts or scaling macules resembling pityriasis vericolor on sun-exposed skin. Histogenetic predisposition and human papilloma virus infection play a part. As shown in our case there is, depending on HPV subtype and additional exposure to ultraviolet light, a high risk of malignant transformation. These patients require close monitoring.

Carcinoma, Squamous Cell↗
PubMed1999

[Restrictive dermopathy].

Restrictive dermopathy is a rare, fatal, autosomal recessive, congenital skin disease. Rigidity of translucent thin skin, which is thus highly vulnerable and tears, spontaneously causes intra-uterine fetal akinesia or hypokinesia deformation sequence (FADS), characteristic dysmorphic facies with fixed open mouth in O position, and generalized joint contractures (arthrogryposis). Polyhydramnios and pulmonary hypoplasia are distinctive manifestations, leading to respiratory insufficiency and premature delivery at about 31 weeks of gestation. We report on a case of a prematurely born infant who presented with the typical morphological features and describe the light- and electron-microscopical findings as described in the literature.

Abnormalities, Multiple↗
PubMed1999

[Correlation between histological and molecular mechanisms of carcinogenesis in stomach cancer].

Since gastric cancer is an exceptional heterogeneous tumor conflicting results have been obtained about the relationship between genotype and phenotype. From the molecular point of view gastric carcinoma diffuse type forms a distinct entity which is microsatellite stable, has almost no p53 mutations and exhibits in at least half of the cases mutations in the E-cadherin gene. In contrast, all other gastric carcinomas comprise a heterogeneous group of which about one third exhibits microsatellite instability (MSI) but no p53 protein stabilization or gene mutations. These tumors are either of pure intestinal (glandular) type or show large solid (medullary) tumor cell clusters. Thereby, in sporadic gastric cancer MSI is caused by loss of hMLH1 expression due to hypermethylation of the promotor region rather than by mutation of the gene itself. Tumors that are microsatellite stable (MSS) and show p53 alterations are either intestinal (about 70%) or a mixed-type encompassing at least 5% glandular and poorly differentiated diffuse components (about 30%). Whereas pure diffuse type gastric cancer is unlikely to develop from intestinal type carcinoma, this may, however, be the case in some advanced mixed-type gastric cancers.

Base Pair Mismatch↗