Pseudoneoplasms in the nervous system

Intracranial Inflammatory Myofibroblastic Tumor with Negative Expression of Anaplastic Lymphoma Kinase: A Case Report and Review of the Literature

BACKGROUND

Inflammatory myofibroblastic tumor (IMT) is an indolent tumor mainly affecting children and young adults. As a rare mesenchymal tumor with unknown etiology and pathogenesis, IMT has a predilection for the lung and abdominopelvic region. Previous literature featuring IMT in the central nervous system (IMT-CNS) is rare. The clinical symptoms and radiologic features of IMT-CNS are not specific; therefore, the diagnosis is predominately based on the histopathologic and immunohistochemical analysis of the specimen.

CASE DESCRIPTION

We herein present a case of a 21-year-old woman who complained of bilateral blurred vision for 15 days. Head magnetic resonance imaging demonstrated a round-shaped and irregular lesion located in the right frontal lobe. The boundary of the lesion was clear, and the lesion was homogeneously enhanced. Peripheral edema of the lesion was observed, and the mass effect was obvious. Supratentorial craniotomy tumor resection was performed. Histopathologic and immunohistochemical analysis revealed IMT, which had negative expression of anaplastic lymphoma kinase.

CONCLUSIONS

Remission of her symptoms was observed, and no recurrence was recorded during a 6-month follow-up.

Intraocular inflammatory mass associated with lens-induced uveitis

Intraocular inflammatory tumefactions large enough to simulate neoplasms are uncommon. We report a patient with a large intraocular inflammatory mass composed of cells with features of histiocytes and myofibroblasts that was associated with lens-induced uveitis. The spindle cell mass appears to have arisen as an exaggerated response to exposed lens fibers. Although information from immunohistochemistry and cytogenetics has advanced the classification of inflammatory tumefactions, this case highlights the challenges in establishing the nature of these lesions.