Metastatic mastery: the uncommon journey of papillary thyroid carcinoma to the brain (a case report)

Papillary thyroid carcinoma is one of the most common thyroid malignancy, often has excellent prognosis and low incidence of distant metastatic conditions. Brain metastases from papillary thyroid carcinoma has a rare occurrence, with patients presenting with non-specific symptoms such as headaches, cognitive changes etc., and poor survival outcomes. The standard protocol for diagnosis and treatment remains controversial. We report a patient who presented with cerebral metastasis prior to the diagnosis of papillary thyroid carcinoma, review the current literature, and explain our approach on the basis of clinical, pathological, and radiological data. A 60-year-old hypertensive male presented with lower back pain, bilateral lower limb weakness, occasional episodes of frontal headache and personality changes. The diagnostic evaluation included computed tomography (CT) scan, magnetic resonance imaging (MRI) with and without contrast enhancement, and color Doppler. Intra-axial complex solid cystic mass lesion in the right parieto-occipital region with significant perilesional oedema, and imaging characteristic of neoplastic etiology were observed. He was posted for excision of tumor and underwent right occipital craniotomy. Histopathological analysis of the surgical specimen confirmed papillary carcinoma of the thyroid gland. Brain metastases from thyroid malignancy is a sign of detrimental prognosis, hence, thorough clinical, radiological and pathological evaluation for rapid detection is critical. Neurosurgical removal along with radiotherapy should be considered as treatment of choice. The information obtained contributes towards better management and overall long-term outcomes.