Type 1-primary cutaneous meningioma of the scalp

Cutaneous meningioma

Cutaneous meningioma is a rare tumor that most commonly occurs on the scalp and occurs in both congenital and acquired forms. It invokes a wide clinical differential diagnosis, but diagnosis is based on characteristic histologic and cytologic findings. Congenital lesions can often present years after birth and even in adult patients. Acquired lesions occur in adulthood. We review histologic, cytologic, and electron microscopic findings and explore how these are used to separate this entity from other entities in the differential diagnosis. While ultrastructural and cytologic findings are similar to those of more common intracranial meningiomas, these tumors exhibit a range of histologic differences. A lack of awareness of this entity precludes correct diagnosis.

Primary meningioma of the nasal septum: a case report and review of literature

Extracranial meningiomas are rare tumors that usually represent extensions from intracranial lesions. Here, we report a case of primary meningioma of the nasal septum. A 60-year-old man presented with nasal obstruction and postnasal drip. On examination he had a mass in the nasal cavity. Computed tomography studies revealed absence of intracranial extensions. The mass was successfully excised and the histologic diagnosis of meningioma was established. This report documents what we believe to be the first case (in English medical literature) of an extracranial meningioma, involving the nasal septum. The clinicopathologic features and pathogenesis of the primary nasal meningioma is briefly discussed.

A meningioma of the scalp that might have developed from a rudimentary meningocele

Meningiomas of the skin are extremely rare. In this case of a congenital meningioma of the scalp, magnetic resonance imaging showed no communication to the meninges. The histological examination discovered a small group of meningioma cells in the periosteum, supporting the assumption that primary cutaneous meningiomas may develop from rudimentary meningoceles.

Closed cranial meningocele with no communication to the CNS

We present a case of two separate closed parietal meningoceles without communication to the CNS and not in the midline. This is the first such case reported in the literature.

Congenital hamartoma of the scalp with meningothelial, sebaceus, muscular, and immature glandular components

A 4-month-old boy presented with a congenital, solitary, yellowish-red, eroded tumor on the scalp, histologically characterized by an ectopic proliferation of vascular and meningothelial elements intimately admixed with mature connective-tissue elements, adipose tissue, and smooth-muscular fibers. In addition, the presence of characteristic histopathological features of a nevus sebaceus and areas with immature glandular differentiation were observed. The diagnosis of a congenital hamartoma of the scalp with meningothelial, sebaceus, immature glandular, and muscular components was established. We review the heterogeneous group of cutaneous lesions with meningothelial elements and their pathogenesis.