external male genitalia atrophy external masculine genital organ atrophy atrophic external male genitals acquired diminution of the size of the external masculine genital organs, associated with wasting as from death and reabsorbtion of cells, diminished cellular proliferation, decreased cellular volume, pressure, ischemia, malnutrition, reduced function or malfunction, or hormonal changes external male organa genitalia atrophy MPheno.ontology external male genital atrophy organa genitalia masculina externa atrophy MP:0009201 small external male genitalia