Dural Tuberculoma Mimicking Meningioma: A Clinicoradiologic Review of Dural En-Plaque Lesions.

BACKGROUND: Tuberculosis has long been a major health concern in developing countries and now has troubled developed world as well, owing to increase in patients with human immunodeficiency virus and immigration. Central nervous system tuberculosis accounts for approximately 1% of cases of tuberculosis. The pathologic presentation is varied, with intraparenchymal tuberculomas and pachymeningitis being the most common. Being a great mimicker, it simulates numerous diseases radiologically, and this is best realized when atypical forms are encountered. Here an atypical case of dural en-plaque tuberculoma is presented with comprehensive review of dural en-plaque lesions with their differentiating features. CASE REPORT: A 20-year-old man presented with features of increased intracranial pressure. On imaging, there was an enhancing dural-based lesion in the left frontoparietal region. In view of herniation syndrome, urgent surgical decompression of the lesion was performed. Histopathology showed features of tuberculosis. The patient is now asymptomatic with antitubercular therapy without any residual lesion at 6 months of follow-up.
CONCLUSIONS: Tuberculoma en-plaque is an unusual entity characterized by a plaque-like meningitic process without exudation. It is easily confused with meningiomas as can other dural-based lesions comprising benign to malignant neoplastic, infectious, and granulomatous lesions. A preoperative diagnosis is imperative to differentiate it at least from neoplastic lesions, which are usually curable with surgical intervention in contrast to tuberculosis, which needs only optimal chemotherapy in most of the cases. Knowledge of differentiating imaging features, in corroboration with clinical history and high index of suspicion, helps in a proper preoperative diagnosis and optimal patient treatment.