Extraskeletal @entity3293 is a rare but distinct entity with special clinicopathological, immunohistochemical, cytogenetical and outcome features. This @entity5 developed from soft tissues. A few cases have been reported in the head and neck in the literature. We report two new cases of extraskeletal myxoid chrondrosarcoma presenting in such an unusual site: one involved the left nasal cavity of a 67-year-old @entity1 and the second the sphenoidal sinus of a 71-year-old @entity1 . The microscopic examination revealed nests of round small cells dispersed in a @entity4494 . The myxoid material was stained with Alcian Blue with and without hyaluronidase application whereas no PAS staining was observed. The immunohistochemical staining showed reactivity with S-100 protein and @entity2277 in two cases and with @entity10208 in one case. These results allowed us to exclude other differential diagnoses: soft @entity8650 with a @entity4494 ( @entity4494 , @entity243 and myxofibrosarcoma). No staining with anti- @entity6826 allowed us to exclude @entity3580 . Curative surgery was not possible. Both @entity1 were given radiotherapy and the @entity5 regressed in one.

[Extraskeletal XXXX of the nasopharynx].

@entity1 :: ('9606', 'Species') :: ['woman', 'patients', 'man'] @entity8650 :: ('MESH:D012983', 'Disease') :: ['tissue tumors'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor'] @entity4494 :: ('MESH:D045888', 'Disease') :: ['myxoid stroma', 'myxoma'] @entity243 :: ('MESH:D018208', 'Disease') :: ['myxoid liposarcoma'] @entity3293 :: ('MESH:C563195', 'Disease') :: ['myxoid chondrosarcoma'] @entity10208 :: ('MESH:D054069', 'Disease') :: ['EMA'] @entity3580 :: ('MESH:D002817', 'Disease') :: ['chordoma'] @entity2277 :: ('7431', 'Gene') :: ['vimentin'] @entity6826 :: ('4254', 'Gene') :: ['KL1']
@entity3293 :: (MESH:C563195,Disease) :: ['myxoid chondrosarcoma']
