MedGen

Nasopharyngeal carcinoma (NPCA) is a malignant tumor that emerges from the epithelium of the nasopharynx. It has a high incidence in southern China, and evidence suggests that there may be a genetic component that underlies familial clustering. Some patients have onset before 20 years of age (summary by Dai et al., 2016) For a general phenotypic description and a discussion of genetic heterogeneity of susceptibility to nasopharyngeal carcinoma, see NPCA1 (607107). [from OMIM]

An abnormality of histiocytes, in which the cells take on a sea blue appearance due to abnormally increased lipid content. Histiocytes are a type of macrophage. Sea-blue histiocytes are typically large macrophages from 20 to 60 micrometers in diameter with a single eccentric nucleus whose cytoplasm if packed with sea-blue or blue-green granules when stained with Wright-Giemsa. [from HPO]

Progressive myoclonic epilepsy-6 (EPM6) is an autosomal recessive neurologic disorder characterized by onset of ataxia in the first years of life, followed by action myoclonus and seizures later in childhood, and loss of independent ambulation in the second decade. Cognition is not usually affected, although mild memory difficulties may occur in the third decade (summary by Corbett et al., 2011). For a discussion of genetic heterogeneity of progressive myoclonic epilepsy, see EPM1A (254800). [from OMIM]

An unusual presentation of schistosomiasis characterized by a pruritic papular rash in the perigenital or periumbilical area due to an allergic reaction to schistosoma eggs deposited in the skin. [from NCI]