A cysticus lymphangioma ritka, nyirokér-eredetű benignus neoplasia, melyről kevés irodalmi adat áll rendelkezésre. Főként gyermekek betegségeként írják le, és hátterében congenitalis malformatiót véleményeznek. Elsődleges lokalizációja a fej-nyaki és az axillaris régió, ugyanakkor hasűri manifesztáció is előfordulhat, mely esetekben a diverz klinikai kép végett ritkán merül fel ezen entitás differenciáldiagnosztikai lehetőségként. Az általunk bemutatott esetismertetésben egy 10 éves leánygyermek került osztályos felvételre görcsös hasi fájdalom miatt, melynek hátterében a hasi ultrahangvizsgálat az ileum területén a mesenteriumot is érintő, számos cysticus képletből álló tumort véleményezett. A laesio volvulust is okozott, és az érintett bélszakasz reszekciója megtörtént. A makroszkópos vizsgálat során barnás, zavaros bennékű, cystosus képleteket észleltünk. Mikroszkóposan a lamina propriában, a tunica submucosában, a tunica muscularisban és a környező mesenterialis zsírszövetben is számtalan, cysticusan kitágult nyirokér átmetszete volt látható, melyeket atípiamentes, lapos endothelsejtek béleltek. Immunhisztokémiai vizsgálat során diffúz, erős CD31-, továbbá CD34-pozitivitás volt tapasztalható. Az esetet cysticus lymphangiomának véleményeztük. A beteg a műtét óta tünetmentes. Közleményünkben a cysticus lymphangioma igen ritka abdominalis manifesztációját mutatjuk be irodalmi áttekintés mellett, a magyar irodalomban először. A nemzetközi leírásokban is tükröződő, sokrétű klinikai megjelenés jól mutatja, hogy ezen laesio felismerése és differenciáldiagnosztikai megfontolása körülményes lehet, azonban képalkotó vizsgálattal és szövettani, szükség esetén immunhisztokémiai vizsgálatokkal definitív diagnózishoz juthatunk. A nemzetközileg alkalmazott ’gold standard’ laparoszkópos reszekció után jó prognózis mutatkozik a leírt eseteken. Orv Hetil. 2024; 165(29): 1135–1139.

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BACKGROUND: Lymphangiomas belong to the group of benign vascular tumors that originate in the lymphatic tissue. Up to 90% of cases manifest in children before the second year of life. In adults, their presence is very rare. In most cases, they are located in the head, neck and axilla. Intra-abdominal lymphangiomas are very rare and represent less than 1% of all cases.
METHODS: The authors present the case of a 64-year-old female patient diagnosed with an intra-abdominal cystic lesion following a routine examination. A CT scan of the abdomen confirmed a cystic lesion located in the lesser omentum between the left lobe of the liver and the lesser curvature of the stomach. The patient was scheduled for laparoscopic exstirpation of the lesion. Histological examination confirmed the clinical diagnosis of cystic lymphangioma of the lesser omentum.
CONCLUSIONS: The etiopathogenesis of lymphangiomas remains unclear. Despite the fact that they are benign tumors, lymphangiomas tend to have an infiltrative pattern of growth, invading surrounding structures. The majority of cases are asymptomatic and the diagnosis is incidental. The gold standard in treatment remains complete surgical extirpation with microscopically negative margins.

BACKGROUND: Manifestation of cystic hygroma in adulthood is very rare. The rarity of cystic hygroma in adults has caused problems in its diagnosis and management and few studies have reported cystic hygroma in adults.
METHODS: In this study, we reported a rare case with cervical cystic hygroma in adults. We report a 20-year-old Iranian male (Iranian ethnicity) with a diagnosis of right-side neck cystic hygroma and discuss the presentation, diagnosis, and clinical, radiological, and operative aspects of it.
CONCLUSIONS: Cystic hygromas are a rare occurrence in adults. They are typically asymptomatic, rarely complicated, and can be mistaken for a cystic neck mass. This study showed that in our case, surgical resection may be a safe and effective treatment for cystic hygroma, with minimal risk of complications during the procedure.

Abnormal cystic lymphangioma is a rare, benign tumour of lymphatic origin that often presents with subtle clinical symptoms. A man in his 20s sought medical attention for a progressively tender mass located in the right lower quadrant. Following ultrasound and CT imaging, surgical pathology confirmed the presence of abnormal cystic lymphangioma. This case is noteworthy because of the patient\'s young age and the retroperitoneal location. An exploratory laparotomy was performed, mitigating the risk of recurrence. In the future, if imaging identifies a cystic mass, consideration of abnormal cystic lymphangioma within the differential diagnosis is imperative. Despite its predominantly subtle symptoms and non-malignant nature, the mass effect by the abnormal cystic lymphangioma can compromise surrounding structures. Overall, clinicians confronted with a cystic mass should adopt a comprehensive diagnostic approach, encompassing abnormal cystic lymphangioma in the differential diagnosis due to its unknown and complex nature.

BACKGROUND: The molecular mechanism of fetal cystic hygroma (CH) is still unclear, and no study has previously reported the transcriptome changes of single cells in CH. In this study, single-cell transcriptome sequencing (scRNA-seq) was used to investigate the characteristics of cell subsets in the lesion tissues of CH patients.
METHODS: Lymphoid tissue collected from CH patients and control donors for scRNA-seq analysis. Differentially expressed gene enrichment in major cell subpopulations as well as cell-cell communication were analyzed. At the same time, the expression and interactions of important VEGF signaling pathway molecules were analyzed, and potential transcription factors that could bind to KDR (VEGFR2) were predicted.
RESULTS: The results of scRNA-seq showed that fibroblasts accounted for the largest proportion in the lymphatic lesions of CH patients. There was a significant increase in the proportion of lymphatic endothelial cell subsets between the cases and controls. The VEGF signaling pathway is enriched in lymphatic endothelial cells and participates in the regulation of cell-cell communication between lymphatic endothelial cells and other cells. The key regulatory gene KDR in the VEGF signaling pathway is highly expressed in CH patients and interacts with other differentially expressed EDN1, TAGLN, and CLDN5 Finally, we found that STAT1 could bind to the KDR promoter region, which may play an important role in promoting KDR up-regulation.
CONCLUSIONS: Our comprehensive delineation of the cellular composition in tumor tissues of CH patients using single-cell RNA-sequencing identified the enrichment of lymphatic endothelial cells in CH and highlighted the activation of the VEGF signaling pathway in lymphoid endothelial cells as a potential modulator. The molecular and cellular pathogenesis of fetal cystic hygroma (CH) remains largely unknown. This study examined the distribution and gene expression signature of each cell subpopulation and the possible role of VEGF signaling in lymphatic endothelial cells in regulating the progression of CH by single-cell transcriptome sequencing. The enrichment of lymphatic endothelial cells in CH and the activation of the VEGF signaling pathway in lymphatic endothelial cells provide some clues to the pathogenesis of CH from the perspective of cell subpopulations.

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Congenital myopathies are a genetically heterogeneous group of neuromuscular disorders that commonly present with congenital hypotonia and weakness but can also present broadly. The most severe presentation is neonatal with arthrogryposis and, rarely, fetal akinesia and pterygia, features also seen in lethal multiple pterygium syndrome (LMPS). We describe two fetuses with similar phenotype, including hydrops fetalis, large cystic hygromas, bilateral talipes, and fetal akinesia in the second trimester. Genetic diagnoses were made using exome sequencing. Both fetuses had a severe form of congenital myopathy. In the first fetus, we identified two novel compound heterozygous likely pathogenic variants consistent with autosomal recessive RYR1-related congenital myopathy (congenital myopathy 1B). In the second fetus, we identified two likely pathogenic variants, one of which is novel, likely in trans consistent with a diagnosis of autosomal recessive NEB-related congenital myopathy. Reaching a genetic diagnosis for these fetuses allowed the families to receive accurate genetic counseling for future pregnancies. These fetuses highlight the genetic and phenotypic heterogeneity of LMPS, and support a broad approach to genetic testing.

A late adolescent primigravida was found to have a fetus with a cystic hygroma and significant shortening of the limbs on first-trimester ultrasound. She underwent chorionic villus sampling with normal microarray result. In the early second trimester, the fetus was found to have the absence of all four limbs and a thorough skeletal dysplasia workup was pursued, identifying a variant in the FLNB gene (c.62C>G). The patient underwent termination of pregnancy. The care of this patient was expedited by first-trimester sonographic evidence of limb abnormalities enabling timely clinical management.