# Minute Pulmonary Meningothelial-Like Nodules: An Incidental Benign Entity in Association With Lung Adenocarcinoma

## TL;DR

This paper describes a case where a patient with lung cancer also had benign nodules that could be mistaken for cancer, highlighting the importance of accurate diagnosis.

## Contribution

The paper presents a case emphasizing the recognition of MPMNs as a benign entity to avoid misdiagnosis in lung cancer patients.

## Key findings

- MPMNs are benign nodules often found incidentally in patients with lung adenocarcinoma.
- These nodules are typically located along interlobular septa and are stable, not metastatic.
- Accurate identification of MPMNs is crucial to prevent unnecessary treatment.

## Abstract

We report a case of a 69-year-old female smoker who presented with multiple pulmonary micronodules incidentally noted during imaging for aortoiliac occlusive disease. A growing right lower lobe nodule was resected, revealing adenocarcinoma alongside benign minute pulmonary meningothelial-like nodules (MPMNs). MPMNs, often found incidentally, in association with malignancies, can mimic metastatic disease but are benign and stable. Recognizing MPMNs is essential to prevent misdiagnosis and unnecessary treatment in patients with coexisting malignancies. On chest CT, these nodules are typically peripherally located along the interlobular septa, consistent with their close vascular association around the small pulmonary veins observed in pathology.