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Metastasis formation after resection of meningiomas is a rare event, predominantly occurring with malignant phenotypes. As far as we know, the presented case is the first report in the literature of iatrogenic seeding of a benign meningioma to the scalp following surgery. A 37-year-old woman was admitted because of a relapsing meningioma in the frontal lobe. In 1997, she had undergone complete excision of an atypical meningioma in same location. At follow-up, three new masses were found: a bifrontal meningioma on the edge of the falx, a smaller one in the falx just under the saggital sinus and a small mass, believed to be ectopic, in the periosteum at the site of the previous craniotomy. Surgical therapy was indicated. Histologically, the ectopic tumor was an atypical meningioma, similar to the one excised 10 years previously, with no relation to the other two intracranial masses. Because of the histological similarity and the location in the old craniotomy, the ectopic tumor was believed to have developed from an implantation metastasis as a consequence of the first surgery. The authors suggest that strict adherence to oncological principles should be applied in the case of benign neoplasms in order to prevent contamination of wounds with tumor cells and potential recurrence.

Primary ectopic meningiomas occurring in the mediastinal region are extremely rare. So far, only five cases of primary mediastinal meningioma have been reported in the literatures. The imaging characteristics and the clinicopathological significance of mediastinal psammomatous meningioma have not been detailed. Here, we report the case of a 42-year-old male with primary posterior mediastinal psammomatous meningioma. The clinical features, imaging, and pathological findings are carefully analyzed, and the relevant literatures were reviewed.

Ectopic (extradural) meningiomas that do not originate from either the optic fascicle or the intracranial meninges are exceedingly rare. A patient with an ectopic meningioma in the external auditory canal and mastoid was treated in our unit. The world literature of the last 20 years was reviewed.

Extradural ectopic meningioma is a rare tumor. We report on an example of microcystic meningioma arising in the skull of an elderly woman. Radiological examination revealed a localized osteolytic lesion in the left parietal bone. At surgery, it was discovered that the tumor was located within the skull without any evidence of extraosseous extension. The light microscopic, immunohistochemical and ultrastructural features were consistent with a microcystic variant of meningioma. To our knowledge, this is the first case of an intraosseous microcystic meningioma, and we believe that this type of meningioma should be considered in the differential diagnoses of myxoid bone tumors of the calvarium.

Introduction Extra-cranial meningioma or ectopic meningioma is a rare tumor. This tumor has been reported in various anatomic sites in the head and neck, mediastinum, skin and soft tissues. We report a rare case of ectopic meningioma in the submandibular region detected by using fine-needle aspiration cytology, histopathology and immunohistochemistry. This case represents another unusual site for extra-cranial meningioma, which prompted us to report it. Case presentation An 18-year-old Dravidian woman presented with swelling in the right submandibular region. The computed tomographic scan findings were suggestive of a neoplastic mass lesion in the right submandibular region. Fine-needle aspiration cytology led to the differential diagnosis of a monomorphic adenoma of a salivary gland or an ectopic meningioma. The patient underwent excision of the submandibular gland and tumor. The histological examination and immunohistochemistry studies confirmed that the lesion was an extra-cranial meningioma. At her two-year follow-up examination, there was no recurrence of the tumor. Conclusion Our experience with this case indicates that, although rare, meningioma should be entertained in the differential diagnosis of a mass lesion in the head and neck region.

Dieses ist nach unseren Kenntnissen der 1. Fallbericht eines primar extrakraniellen, in der Tonsille lokalisierten Meningeoms. Immunhistologisch wies der Tumor eine Koexpression von Vimentin und neuronspezifischer Enolase (NSE) und eine negative Reaktion mit Antikorpern gegen die Zytokeratine KL 1, 13/10, 8, 18, das epitheliale Membranantigen EMA und Melanom Protein (HMB 45) auf. Aufgrund der lokal gesteigerten Mitoserate scheint es gerechtfertigt, den vorliegenden Tumor als atypisches Meningeom zu klassifizieren.

Meningothelial hamartomas are rare congenital scalp lesions composed of an admixture of cells including the meningothelial cell type. Histologically they are characterized as lesions with proliferative connective tissue, epitheloid cells forming interanastamosing vascular channels, and meningothelial elements. Lopez first described these lesions in 1974 and since that time a total of 32 cases have been reported [3]. In previous reports, they have been referred to as hamartomas with ectopic meningothelial elements, sequestered or rudimentary meningocele, and ectopic meningioma [1, 3, 5]. Two additional cases of meningothelial hamartomas are discussed as to their clinical presentation, work up, pathological findings at excision, and outcome. A persistent connection with the central nervous system remains a primary concern and mandates adequate preoperative testing to exclude this possibility.

An 11-year-old boy presented with epistaxis and proptosis. Plain X-ray revealed a bony mass in the nasal cavity. Computed tomography showed a high-density mass which at surgery turned out to be a meningioma.

A case of Ectopic Meningioma of the nose and ethmoid sinus is reported. It’s theories of origin, clinical features and management have been discussed.