These cusps were composed of a core of loose
mesenchymal tissue covered by the flattened endocardium.
However, there was an intercalated duct presents almost in close proximity to islet and abundant
mesenchymal tissue.
Carefully extracting
mesenchymal tissue such as myometrial smooth muscles and using double-labeling experiments argued against true epithelial contamination.
14) Since pulmonary hamartomas are believed to originate from bronchial
mesenchymal tissue and have a smooth muscle component in most cases, (10,15) a similar recruiting mechanism may apply in hamartomas that account for the numerous mast cells in the areas of PT.
Several reports of the coexistence of residual
mesenchymal tissue and chronic middle ear inflammation in childhood have been published, (2,6-8) but the presence of
mesenchymal tissue in the pathogenesis of silent otitis media is still debatable.
These tumors exhibit an admixture of malignant epithelial and
mesenchymal tissue, with the latter occasionally demonstrating heterologous differentiation.
In addition, SCEVs appear to lack myoepithelial differentiation ultrastructurally, and they lack the spectrum of morphologic
mesenchymal tissue (ie, chondroid and bone) seen in other mixed tumors.
These MSCs are characterized by a high proliferation potential and the capability to differentiate into progenitor cells for distinct
mesenchymal tissues (Caplan, 1991).
1) RMS are malignancies derived from primitive
mesenchymal tissues that exhibit a tendency toward myogenic differentiation and probably originate from satellite cells associated with the embryogenesis of skeletal muscle.
Mesenchymal stem cells were also shown to commit to the lineages of other
mesenchymal tissues such as cartilage, fat, marrow stroma, liver, kidney, and muscle cells (11), (12), (13), (14).
It is also proposed that the detection of fibroadipose tissue masses with a proportional enlargement of other
mesenchymal tissues on MRI should be used as the diagnostic method of choice for macrodystrophia lipomatosa (8).
