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Updated: May 13, 2026

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury
Published on: March 21, 2025
47-year-old man with left leg numbness
Ali Mahta1, Ryan Y Kim, Ali G Saad
1Department of Neurosciences, Moores Cancer Center, UC San Diego, 3855 Health Sciences Drive, La Jolla, CA 92093-0819, USA.
A patient with a history of uveitis, hypercalcemia, and kidney stones experienced a seizure. Brain imaging revealed a mass, later diagnosed as neurosarcoidosis via biopsy.
Area of Science:
- Neurology
- Immunology
- Oncology
Background:
- Neurosarcoidosis is a rare neurological manifestation of sarcoidosis.
- It can present with diverse neurological symptoms, mimicking other brain pathologies.
- Systemic sarcoidosis often involves other organs, such as the eyes and kidneys.
Observation:
- A 47-year-old male with a history of uveitis, hypercalcemia, and nephrolithiasis presented with acute partial seizures.
- Physical examination revealed decreased sensation in the left lower extremity.
- Brain MRI showed a right frontal mass, initially suspected to be a tumor or metastasis.
Findings:
- Biopsy of the right frontal mass confirmed a non-caseating granulomatous lesion.
- The histological findings were consistent with neurosarcoidosis.
- This diagnosis explained the patient's neurological symptoms and history of systemic involvement.
Implications:
- Highlights the importance of considering neurosarcoidosis in the differential diagnosis of brain masses, especially in patients with a history of sarcoidosis or related conditions.
- Emphasizes the need for thorough diagnostic workup, including biopsy, to differentiate neurosarcoidosis from primary brain tumors or metastases.
- Suggests that early and accurate diagnosis of neurosarcoidosis is crucial for appropriate management and to prevent further neurological damage.
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