@entity189 arising in the maxillary sinus, occasionally present clinically in the oral cavity along the occlusal ridge of the upper alveolus. The mechanism of this spread has not been investigated but it may resemble invasion of the mandible by @entity1697 , which tend to invade the soft tissues rather than eroding through bone. In Britain, such @entity1 are usually edentulous. This project examines @entity3573 sinus to determine possible routes of spread. Maxillae were obtained from one side of 17 dissecting room cadavers, aged 71-95 years; 15 were edentulous. The roof of the maxillary sinus was removed in all specimens. Five maxillae were each cut into six slices, 0.5 cm thick, in a vertical bucco-lingual plane. In all, soft tissues were removed by treatment in dilute bleach. Histological sections, cut in the horizontal plane, were prepared of a further three maxillae. Several possible routes were identified by which @entity5 could spread from the sinus to the oral cavity: 1) directly through foramina in its floor; 2) through numerous foramina in its floor to the marrow cavity of the alveolar process, which mostly contained fat amongst narrow bony trabeculae. (The marrow cavity, in turn, had numerous communications with the occlusal surface); 3) through foramina which carried branches of the superior alveolar nerves and vessels; 4) through @entity531 and elsewhere.

Possible routes of spread of XXXX .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity1697 :: ('MESH:D009062', 'Disease') :: ['oral carcinomas'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumors'] @entity189 :: ('MESH:D002277', 'Disease') :: ['Carcinomas'] @entity3573 :: ('MESH:D008439', 'Disease') :: ['deficiencies in the bony walls of the maxillary'] @entity531 :: ('MESH:D013901', 'Disease') :: ['deficiencies in the bony walls of the sinus at the neurovascular grooves']
@entity1697 :: (MESH:D009062,Disease) :: ['carcinoma of the maxillary sinus to the oral cavity']
