{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T13:08:06Z","timestamp":1789736886608,"version":"4.0.1"},"reference-count":19,"publisher":"Scientific Scholar","content-domain":{"domain":["surgicalneurologyint.com"],"crossmark-restriction":true},"short-container-title":[],"abstract":"<jats:sec id=\"st1\">\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>Tumor-to-tumor metastasis (TTM) to a meningioma is rare. Atypical meningioma-like lesion with systemic cancer risk factors warrants evaluation for metastatic disease before resection.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"st2\">\n                    <jats:title>Case Description:<\/jats:title>\n                    <jats:p>An 80-year-old man with a smoking history and pulmonary emphysema presented with progressive cognitive decline. Magnetic resonance imaging showed a rapidly enlarging left sphenoid ridge dural-based mass with heterogeneous enhancement and extensive peritumoral edema. Chest radiography revealed a right upper paramediastinal opacity, but chest computed tomography and systemic staging were not performed before craniotomy. Histopathology demonstrated metastatic small cell carcinoma within a meningothelial meningioma, confirming TTM. Postoperative imaging supported small cell carcinoma of presumed pulmonary origin. Despite radiotherapy and chemotherapy, leptomeningeal dissemination developed, and the patient died 15 months after surgery.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"st3\">\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>In older smokers with abnormal chest radiograph and atypical meningioma-like lesions, systemic malignancy should be evaluated before resection. When surgery is necessary, the operative goal should prioritize tissue diagnosis and decompression.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.25259\/sni_948_2026","type":"journal-article","created":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T12:47:09Z","timestamp":1789735629000},"page":"525","update-policy":"https:\/\/doi.org\/10.25259\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Tumor-to-tumor metastasis of small cell carcinoma of presumed pulmonary origin to a sphenoid ridge meningioma: A diagnostic pitfall in preoperative systemic evaluation"],"prefix":"10.25259","volume":"17","author":[{"given":"Satoru","family":"Yabuno","sequence":"first","affiliation":[{"name":"Department of Neurosurgery, Kagawa Rosai Hospital, Marugame, Japan"},{"name":"Department of Neurosurgery, Kagawa Prefectural Central Hospital, Takamatsu, Kagawa, Japan"},{"name":"Department of Neurological Surgery, Okayama University Graduate School of Medicine, Dentistry 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