Minute pulmonary meningothelial-like nodules in the transbronchial biopsy of a lung transplant recipient

Minute pulmonary meningothelial-like nodules (MPMN)
are small (100 µm–few mm) asymptomatic nodules,
often identified as incidental findings in microscopic
studies of lung samples. MPMNs have been found in
subjects ranging in age from 12 to 91 years (up to 85%
women) and more frequently in the right lung. The
lesions consist of whorls/nests of moderately sized cells
with eosinophilic cytoplasms. The cells are spindle or
elongated. The nuclei are oval with finely granulated
chromatin and small or absent nucleoli. These lesions
have been initially called “minute pulmonary tumors
representing chemodectomas.”