Multifocal micronodular pneumocyte hyperplasia

Multifocal micronodular pneumocyte hyperplasia (MMPH) is a subtype of pneumocytic hyperplasia (hyperplasia of pneumocytes lining pulmonary alveoli).

[1][2][3][4][5] Several synonymous terms have been done for this entity: adenomatoid proliferation of alveolar epithelium, papillary alveolar hamartoma, multifocal alveolar hyperplasia, multinodular pneumocyte hyperplasia.

These multifocal lesions are observed in tuberous sclerosis,[6][7] and can be associated with lymphangioleiomyomatosis[8] and perivascular epithelioid cell tumour (PEComa or clear cell "sugar tumor")).

[9] It can be diagnosed through lung biopsy using thoracoscopy.

[10]