MedGen

A decreased magnitude of the sensory perception of sound. [from HPO]

Piebaldism is a rare autosomal dominant trait characterized by the congenital absence of melanocytes in affected areas of the skin and hair. A white forelock of hair, often triangular in shape, may be the only manifestation, or both the hair and the underlying forehead may be involved. The eyebrows and eyelashes may be affected. Irregularly shaped white patches may be observed on the face, trunk, and extremities, usually in a symmetrical distribution. Typically, islands of hyperpigmentation are present within and at the border of depigmented areas (summary by Thomas et al., 2004). [from OMIM]

An inherited or acquired condition characterized by the inability to hear in one or both ears. [from NCI]

Any structural anomaly of mast cells, which are found in almost all tissues and contain numerous basophilic granules and are capable of releasing large amounts of histamine and heparin upon activation. [from HPO]

Developmental hypoplasia of the ovary. [from HPO]

Testis not palpable in the scrotum or inguinal canal. [from HPO]

Aplasia, that is failure to develop, of the ovary. [from HPO]