Rare diseases · Sign or symptom
Pneumothorax
Collapsed lung
HP:0002107
What it means
Accumulation of air in the pleural cavity leading to a partially or completely collapsed lung.
In everyday care
Most people with this sign do not have a rare disease — it appears in common conditions far more often. These general reference pages cover the same topic:
Rare diseases that can present with this26
Sometimes5–29%
13- Birt-Hogg-Dubé syndrome
- Chronic graft versus host disease
- Cocaine intoxication
- Congenital tracheomalacia
- Familial thoracic aortic aneurysm and aortic dissection
- Meconium aspiration syndrome
- Musculocontractural Ehlers-Danlos syndrome
- Nocardiosis
and 5 more in this range
Rare1–4%
9- 3-methylglutaconic aciduria-neonatal cataract-neurologic involvement-congenital neutropenia syndrome
- Avian influenza
- Cryptogenic organizing pneumonia
- Cystic fibrosis
- Multiple osteochondromas
- Primary pulmonary hypoplasia
- Pulmonary non-tuberculous mycobacterial infection
- Scimitar syndrome
and 1 more in this range
The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.
Part of the broader category
Tracking symptoms like this for someone? Eleplan keeps symptoms, diagnoses, medications and every specialist in one plan.
Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.