• multiple pulmonary nodules
• primary intraosseous meningioma
• primary pulmonary meningioma

• Humans
• Female
• Meningioma/pathology
• Meningioma/diagnostic imaging
• Meningioma/diagnosis
• Middle Aged
• Meningeal Neoplasms/pathology
• Meningeal Neoplasms/diagnostic imaging
• Lung Neoplasms/pathology
• Lung Neoplasms/diagnosis
• Lung Neoplasms/diagnostic imaging
• Magnetic Resonance Imaging
• Tomography, X-Ray Computed
• Skull/pathology
• Skull/diagnostic imaging
• Lung/pathology
• Lung/diagnostic imaging

• Lung neoplasm
• Minute pulmonary meningothelial-like nodule
• Primary pulmonary meningioma
• Pulmonary meningothelial proliferation
• Rare pulmonary nodular lesion

Minute Pulmonary Meningothelial-like Nodules (MPMNs) are rare benign pulmonary nodules, which are more common in elderly women and have a higher detection rate in lung tissues of patients with lung malignant diseases. Its origin is not yet clear. At present, there are few reports on the diagnostic methods such as imaging and pathological manifestations of MPMNs. This article reports a 70-year-old female patient with pulmonary adenocarcinoma combined with MPMNs and reviews of the relevant literature.

A 70-year-old women was admitted to our institution with feeling sour in her back and occasional cough for more than 2 mo. Computerized electronic scanning scan and 3D reconstruction images in our institution showed there were multiple ground-glass nodules in both of her two lungs. The biggest one was in the apicoposterior segment of left upper lobe, about 2.5 mm × 9 mm in size. We performed thoracoscopic resection of the left upper lung apicoposterior segment of the patient, and the final pathological report was minimally invasive adenocarcinoma. Re-examination of high resolution computed tomography 21 mo after surgery showed multiple ground-glass nodules in both lungs, and a new ground-glass nodule was found in the superior segment of the right lower lobe. We took pathological biopsy of the right upper lung and right lower lung nodules for the patient under thoracoscopy. The histomorphology of the right lower lobe nodule showed multiple lesions in the lung tissue, and the small foci in the alveolar septum were distributed in mild form of the aggregation of short spindle cells. The immunohistochemistry showed that the lesion was epithelial membrane antigen (EMA) (+), somatostatin receptor 2a (SSTR2a) (+), S-100 (-), chromogranin A (-), Syn (-), cytokeratin (-) and HMB-45 (-). The final diagnosis was minimally invasive adenocarcinoma, accompanied by MPMNs. We recommend that patients continue to receive treatment after surgery and to do regular follow-up observations.

The imaging manifestations of MPMNs are atypical, histomorphology and immunohistochemistry can assist in its diagnosis. This article reviews the relevant literature of MPMNs immunohistochemistry and shows that MPMNs are positive for EMA, SSTR2a, and progesterone receptor.

• Lung
• Pathology
• Immunohistochemistry
• Multiple pulmonary nodules
• Minute pulmonary meningothelial-like nodules
• Case report

• Lung neoplasms
• Meningiomas
• Minute pulmonary meningothelial-like nodules
• Multiple primary lung cancer

• FDG PET
• multiple micronodules
• primary pulmonary meningioma

• Minute pulmonary meningothelial-like nodules (MPMNs)
• computed tomography (CT)
• ground-glass nodules (GGNs)
• pathology

To investigate the clinical manifestations, radiologic features, pathological features, and immunophenotype of minute pulmonary meningothelial-like nodules (MPMNs).

This is a retrospective observational study. We collected the clinical data of 7 cases of MPMNs, and performed comprehensive characterization using a combination of clinical, morphological, radiologic and immunohistochemical assessments.

Of the 7 cases of MPMNs, 6 were female and 1 was male. The median age was 55 years. All MPMNs were multiple in lung with the size from 0,01 to 0,5cm. Chest CT examination showed ground-glass attenuation or solid nodules. Four cases were concomitant with carcinoma and/or pneumonia, and 3 cases occurred alone. Four of the 7 patients had no obvious symptoms; 3 patients had chest pain or cough or shortness of breath or hemoptysis. Multiple white nodules were found macroscopically, and the diseased cells grew along the alveolar septum, with relatively normal morphology, rich cytoplasm, unclear cell boundary, and uniform nucleus with delicate chromatin and without atypia; and the diseased cells showed nest or whorls distribution. EMA, PR, CD56 and vimentin were positive in all cases by immunohistochemistry.

MPMNs are rare benign lesions in the lung, often multiple, usually less than 0.5cm in diameter, most of which have no obvious clinical symptoms. MPMNs are often found by chest CT, and occur independently or concomitant with other lesions. The positive immunohistochemical staining of EMA, PR, CD56, vimentin supports the diagnosis.

• National Natural Science Foundation of China
• Natural Science Foundation of Yunnan Province

• immunohistochemistry
• meningioma
• multiple pulmonary nodules

• CT
• Lung
• Minute Pulmonary Meningothelial-like Nodules
• Nodules

• Méningiome pulmonaire primitif
• Primary pulmonary meningioma

• Aged
• Breast Neoplasms
• Female
• Humans
• Lung Neoplasms/diagnosis
• Meningeal Neoplasms
• Meningioma
• Prognosis