(1) The most frequent renal tumor in neonates was the mesoblastic nephroma (3 infants).
(2) Mesoblastic nephroma contained fibronectin but no laminin.
(3) The frequency of mesoblastic nephroma (1%), of bilateral tumors (5%), and of incorrect preoperative diagnosis of Wilms' tumor (5%), the toxicities of the various regimens, and other ancillary data are presented and discussed.
(4) Cytologic diagnosis of mesoblastic nephroma is important because the tumor has an excellent prognosis, and unlike Wilms' tumor, requires only surgery.
(5) In later stages, on human embryos of 11 to 16 mm (37 to 44 days of age; Carnegie stages 16 to 18), the mesoblastic anlage of the appendix is more evident, but it is not invaded by the entoblastic cells which come from the caecum on embryos of 12 to 13 mm.
(6) We have only found eight other reports of adult mesoblastic nephroma.
(7) These results support the hypothesis that a temporary block at some stage in the cell cycle causes mesoblasts to acquire the capacity to differentiate into cartilage cells.
(8) Three main groups are described : ectoblastic, mesoblastic and entoblastic phacomatoses.
(9) These unusual tumors were histologically classified as rhabdoid tumors of the kidney (3 cases) and a cellular mesoblastic nephroma (1 case).
(10) Cellular (or atypical) congenital mesoblastic nephroma (CMN) is a potentially aggressive form of the benign classical congenital mesoblastic nephroma.
(11) Patients 1 and 2 presented during infancy with abdominal masses and hypertension due to bilateral multilocular cysts of the kidney with associated hamartomatous pulmonary cysts; patient 2 also had one area of cellular mesoblastic nephroma.
(12) A case of partially cystic atypical or cellular variant of mesoblastic nephroma in a 27-year old woman is reported.
(13) In contrast to primary mesenchyme or mesoblast, which may form epithelial structures, secondary mesenchyme is incapable of doing so.
(14) The histogenetic relationship to congenital mesoblastic nephroma, Wilms tumor and other tumors is discussed.
(15) The histologic appearance is distinctive and characterized by a marked proliferation of spindled mesenchymal cells resembling the classical type of congenital mesoblastic nephroma, encasing discrete nodules of embryonal epithelium similar to the hyperplastic nephrogenic rests (nephroblastomatosis) usually associated with Wilms' tumor.
(16) However, in view of the possibility of recurrence as shown in rare instances by congenital mesoblastic nephroma, another less aggressive lesion in the spectrum of infantile renal neoplasia, regular follow up is recommended.
(17) Germ cell tumors of this type demonstrate a selective overgrowth of yolk sac endoderm associated with extraembryonic mesoblast and arise perferentially in the gonads of young children.
(18) An acidic fibroblast growth factor-like activity was detected in a primary mesoblastic nephroma.
(19) We have only found 7 other reports of adult mesoblastic nephroma.
(20) Specifically, the high incidence (29%) of mesoblastic nephroma in this age group does not justify such an approach.
Mesoderm
Definition:
(n.) The layer of the blastoderm, between the ectoderm and endoderm; mesoblast. See Illust. of Blastoderm and Ectoderm.
(n.) The middle body layer in some invertebrates.
(n.) The middle layer of tissue in some vegetable structures.
Example Sentences:
(1) Small pieces of anterior and posterior quail wing-bud mesoderm (HH stages 21-23) were placed in in vitro culture for up to 3 days.
(2) Here we report direct measurements of protein kinase C (PKC) activity in uninduced ectoderm, and in neuroectoderm shortly after induction by the involuting mesoderm, in Xenopus laevis embryos.
(3) Cloacal exstrophy, centered on the maldevelopment of the primitive streak mesoderm and cloacal membrane, results in bladder and intestinal exstrophy, omphalocele, gender confusion, and hindgut deformity.
(4) However, the pattern in the central nervous system (CNS) and mesoderm is further restricted; the major expression located in the labial neuromere of the CNS and the mesoderm of the first thoracic segment.
(5) The positive reaction for keratin and vimentin confirmed the presence of ectodermal and mesodermal elements respectively in the tumor.
(6) Little deficit in total mesodermal cell number was found, though the entire mesoderm adopted the histological character proper to only some 40% of that in the normal pattern i.e.
(7) LIF inhibits differentiation under several conditions which lead to endodermal and mesodermal cell lineages including skeletal and cardiac muscle.
(8) The histochemical study of the LDH in the Trout embryo during the early organogenesis shows a specific localization in notochord cells, in mesodermic cells of the terminal knob and in some prosencephalic neuroblasts.
(9) This suggests that a factor in the lateral plate mesoderm in addition to the pronephric duct is inhibiting further ventral migration.
(10) While such speculation on how these spatially separated anomalies develop is probably simplistic, the concept of a mesodermal "malformation" spectrum is helpful in reminding the clinician to look for other mesodermal defects when one mesodermally derived defect or sequence is detected.
(11) Cell biological evidence suggests that mesoderm formation and specification of axial positions occur simultaneously.
(12) The tissues of the endodermal and mesodermal origin were also present in small quantities.
(13) There mesodermal expansion proximal to an arrested edge could be compared with that proximal to a moving edge by measuring the amount of vascular elongation occurring in each.
(14) We also assessed the ability of ta2 limb bud mesoderm to respond to a polarizing signal.
(15) Invaginating mesodermal cells of the lateral and ventral parts also form pseudopodia, and are in contact with the blastocoelic wall.
(16) The aim of this study is to test the ability of the intrinsic wing musculature to develop in the absence of somitic mesoderm.
(17) Maintenance of GHox-8 expression by the anterior mesoderm appears to be independent of the presence of the apical ridge.
(18) Multiple hamartoma syndrome, also known as Cowden's disease, is a rare genodermatosis with multiple organ system involvement affecting tissues derived from ectodermal, endodermal, and mesodermal tissue layers.
(19) A unique pattern for a carbohydrate antigen is displayed by cells of the primitive streak; antigenicity is lost with de-epithelialisation and ingression, but is regained in a pericellular distribution on the mesoderm cells that emerge from the primitive streak.
(20) In the mutants twist and snail, which fail to differentiate the ventrally derived mesoderm, mitoses specific to the mesoderm are absent.