Lung bleb

Lung blebs, also pulmonary belbs, are benign cystic lung lesions.

General

• Benign.
• Risk for pneumothorax.

Clinical history:

• +/-Smoking.

Gross

Cystic lesions:

• Bleb <=1 cm.
• Bulla >1 cm, wall-thickness <= 1 mm.

Microscopic

Features:

• Thin-wall cystic lesions.
  • Blebs are entirely intrapleural.

DDx:

• Emphysema.
• Lymphangioleiomyomatosis (LAM).

Sign out

BLEBS, APEX OF THE LEFT LUNG, WEDGE RESECTION:
- BENIGN LUNG BLEBS.
- EVIDENCE OF PULMONARY HEMORRHAGE.
- NEGATIVE FOR MALIGNANCY.

Micro

The sections show peripheral lung with large dilated air spaces surrounded by a thin walls and lined by respiratory-type epithelium. Siderophages are focally increased. Focal fibrous pleural thickening is present. No significant inflammation is present.

The airspaces and lung interstitium distant from the abnormality is unremarkable. There is no interstitial fibrosis.