Myxoma


 * Myxoma and myxosarcoma are very similar tumors.
 * These are tumors of the mucous mesenchyme (embryonic binder).
 * These tumors in adults are heterologous, i.e. different from the tissue that surrounds them.
 * Macroscopically the tumor is very soft, jelly-like, sharply demarcated.
 * Microscopically it consists of star-shaped, mutually anastomotic cells, the intercellular mass is stained same like mucus (for example mucicarmine) and acidic mucopolysaccharides (for example alcian blue), myxosarcoma is more cellular with more spindle-shaped cells..
 * It occurs almost everywhere, most often in the subcutaneous tissue, in muscle, in the left atrium.
 * The existence of pure myxoma is questioned, rather it is a myxomatous transformation of other tumors:
 * myxolipoma,
 * myxofibroma,
 * myxochondroma,
 * myxoid liposarcoma,
 * myxoid fibrous histiocytoma.

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