Becker nevus syndrome
Findings
No curated finding names Becker nevus syndrome yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Becker nevus syndrome is characterized by the presence of a Becker nevus in association with underdevelopment (hypoplasia) of the breast or other skin-related, muscular, or skeletal defects, all of which usually involve the same side of the bodyas the nevus (ipsilateral). Specific signs and symptoms in addition to the nevus may include ipsilateral breast hypoplasia; skeletal abnormalities such ashypoplasia of the shoulder girdle, scoliosis, fused ribs, and ipsilateral shortness of the arm; and several other features. Thecondition is thought to be sporadic (occurring in individuals with no history of the condition in the family). Treatment varies depending upon the specific symptoms present and the extent of the condition in the affected individual.
Definition from the Mondo Disease Ontology (MONDO:0011500), read 2026-09-29. CC BY 4.0.
Features
23 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- HamartomaHPOHP:0010566
- Very frequent (80% to 99% of cases)
- Hypermelanotic maculeHPOHP:0001034
- Very frequent (80% to 99% of cases)
- LipoatrophyHPOHP:0100578
- Very frequent (80% to 99% of cases)
- MicromeliaHPOHP:0002983
- Very frequent (80% to 99% of cases)
- Shoulder girdle muscle atrophyHPOHP:0003724
- Very frequent (80% to 99% of cases)
- Supernumerary nippleHPOHP:0002558
- Very frequent (80% to 99% of cases)
- Aplasia/Hypoplasia of the breasts
Show the remaining 11
- KyphosisHPOHP:0002808
- Occasional (5% to 29% of cases)
- Lower limb asymmetryHPOHP:0100559
- Occasional (5% to 29% of cases)
- Rib fusionHPOHP:0000902
- Occasional (5% to 29% of cases)
- ScoliosisHPOHP:0002650
- Occasional (5% to 29% of cases)
- Spina bifida occultaHPOHP:0003298
- Occasional (5% to 29% of cases)
- Supernumerary ribsHPOHP:0005815
- Occasional (5% to 29% of cases)
Where it sits
- Narrower terms (1)
Other names
1 name
Resolves to: Becker nevus syndrome
- Also called
- pigmentary hairy epidermal nevus