Myxoma

Myxoma, dyed HE

Myxoma in the left atrium, MRI video

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.

Links[edit | edit source]

PASTOR, Jan. Langenbeck's medical web page [online]. [cit. 18.04.2010]. <https://langenbeck.webs.com/>.