| paranasal sinus neoplasms | Neoplasms or tumours of the paranasal sinuses. Malignant neoplasms are rare, comprising 3% of all head and neck neoplasms. The majority arise in the maxillary sinus with malignancies of the ethmoid sinus constituting virtually all the remaining tumours. (12 Dec 1998) |
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| genital neoplasms, male | Neoplasms of the male genitalia. (12 Dec 1998) |
| maxillary neoplasms | Cancer or tumours of the maxilla or upper jaw. (12 Dec 1998) |
| maxillary sinus neoplasms | Neoplasms or tumours of the maxillary sinus. The majority of paranasal sinus neoplasms arise here. They develop silently when confined to the sinus and produce symptoms on extension through the walls. (12 Dec 1998) |
| central nervous system neoplasms | Neoplasms located in the brain, spinal cord, or meninges. (12 Dec 1998) |
| cerebellar neoplasms | Neoplasms located in the cerebellum. (12 Dec 1998) |
| penile neoplasms | Cancers or tumours of the penis or of its component tissues. (12 Dec 1998) |
| cerebral ventricle neoplasms | Neoplasms located in the brain ventricles including the two lateral, third, and fourth ventricles. (12 Dec 1998) |
| meningeal neoplasms | Neoplasms located in any of the meninges, the dura mater, pia mater, or arachnoid. (12 Dec 1998) |
| choroid neoplasms | Tumours of the choroid; most common intraocular tumours are malignant melanomas of the choroid. These usually occur after puberty and increase in incidence with advancing age. Most malignant melanomas of the uveal tract develop from benign melanomas (nevi). (12 Dec 1998) |
| choroid plexus neoplasms | Neoplasms of the choroid plexus, blood vessels of the pia mater that project into the brain ventricles. (12 Dec 1998) |
| colourectal neoplasms | Cancer of the colon and rectum. The most frequent malignant tumour in the united states. Aetiological factors which increase the risk of colourectal cancer include chronic ulcerative colitis, familial polyposis of the colon, exposure to asbestos, irradiation of the cervix. (12 Dec 1998) |
| colourectal neoplasms, hereditary nonpolyposis | A syndrome characterised by autosomal dominant inheritance, a low mean age (41 years) for occurrence of colon cancer, and a marked increase in the proportion of tumours in the proximal colon. (12 Dec 1998) |
| common bile duct neoplasms | Neoplasms of the common bile duct including vater's ampulla and oddi's sphincter. (12 Dec 1998) |
| pleural neoplasms | Neoplasms of the thin serous membrane that envelopes the lungs and lines the thoracic cavity. Pleural neoplasms are exceedingly rare and are usually not diagnosed until they are advanced because in the early stages they produce no symptoms. (12 Dec 1998) |