Muscle tumors
Keywords:
soft tissue, tumors, muscleAbstract
Sarcomas of muscular origin are frequently found in soft parts. Leiomyosarcomas are rare among them, althoug their incidence has increased as result of better interpretation
of sarcomas formerly classified as fusocellular. Their most probable origin is in muscular elements of vessel -mainly venous- walls thus facilitating
spreading through bloodstream. They are genera!Jy infiltrating and may be limited, but never encapsulet; metastases are mainly Jocated in lung, liver and bones.
Rhabdomyosarcomas form a complex and frequent tumoral complex having its origin in the mesenchyme which forms striated muscles. Three main types can
be distinguished which possibly respond to stages in ontogenic evolution of muscular cells: embryonal (50 % ), alv,eolar ( 40 % ) and pleomorphic adult type ( 10 % ) .
They have in common indexes of presumptive. rhabdomyoblastic origin, especially existence of intracytoplasmatic glucogen and double striae. 'I'heir general characteristics
include Jargeness, infiltration and often, recurrence, as well as production of metastases through ood and Jymph.
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