Preferred Label : Hypertrophy of the breast, juvenile;
Symbol : JHB;
CISMeF acronym : JHB;
Type : Phenotype or locus, molecular basis unknown;
Alternative titles and symbols : Gigantomastia, juvenile;
Description : Familial juvenile hypertrophy of the breast (JHB) is a rare condition characterized
by gigantomastia in peripubertal females. The pathology is limited to the breast with
otherwise normal growth and development (summary by Genzer-Nir et al., 2010). A syndrome
has been described in which affected females display JHB in association with onychodystrophy/anonychia
and abnormalities of the distal phalanges (ODP; see 106995), whereas males have only
ODP (mammary-digital-nail syndrome; 613689).;