Metastatic Spinal Tumor from Benign Pleomorphic Adenoma: Case Report and Literature Review. 2023

Hiroyuki Dan, and Kyongsong Kim, and Rinko Kokubo, and Ryutaro Nomura, and Daijiro Morimoto, and Akio Morita
Department of Neurological Surgery, Nippon Medical School Chiba Hokusoh Hospital.

OBJECTIVE Pleomorphic adenomas tend to arise in the salivary glands. They are rare and histologically benign but can result in distant metastasis, and their characteristics need further investigation. We report a case of locally recurring benign primary palatal pleomorphic adenoma that resulted in spinal metastases and review the relevant literature. METHODS A 58-year-old woman had undergone surgery for a palatal pleomorphic adenoma 22 years earlier and 6 subsequent operations for local recurrences. During follow-up, metastases to multiple organs, including the spine, were diagnosed and 4 CyberKnife treatments were performed. She suffered right flank pain and slight paralysis of the right leg; radiological findings showed a growing metastatic spinal tumor. She underwent removal of a thoracic vertebral tumor and posterolateral fusion. Postoperatively, her symptoms improved. Histopathological analysis indicated a pleomorphic adenoma and no evidence of malignancy. Although there was no local recurrence, 23 months after surgery, a fifth CyberKnife procedure was performed for a growing salivary gland tumor and she is currently being followed up. CONCLUSIONS We described a rare case of benign pleomorphic adenoma that metastasized to the spine. Long-term follow-up for recurrence and metastasis is required for patients with benign pleomorphic adenoma.

UI MeSH Term Description Entries
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D008949 Adenoma, Pleomorphic A benign, slow-growing tumor, most commonly of the salivary gland, occurring as a small, painless, firm nodule, usually of the parotid gland, but also found in any major or accessory salivary gland anywhere in the oral cavity. It is most often seen in women in the fifth decade. Histologically, the tumor presents a variety of cells: cuboidal, columnar, and squamous cells, showing all forms of epithelial growth. (Dorland, 27th ed) Mixed Salivary Gland Tumor,Salivary Gland Tumor, Mixed,Syringoma, Chondroid,Adenomas, Pleomorphic,Chondroid Syringoma,Chondroid Syringomas,Pleomorphic Adenoma,Pleomorphic Adenomas,Syringomas, Chondroid
D010307 Parotid Neoplasms Tumors or cancer of the PAROTID GLAND. Cancer of Parotid,Parotid Cancer,Cancer of the Parotid,Neoplasms, Parotid,Cancer, Parotid,Cancers, Parotid,Neoplasm, Parotid,Parotid Cancers,Parotid Neoplasm
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012468 Salivary Gland Neoplasms Tumors or cancer of the SALIVARY GLANDS. Cancer of Salivary Gland,Non-Sebaceous Lymphadenomas,Salivary Gland Cancer,Salivary Gland Lymphadenomas,Sebaceous Lymphadenomas,Cancer of the Salivary Gland,Neoplasms, Salivary Gland,Cancer, Salivary Gland,Cancers, Salivary Gland,Gland Neoplasm, Salivary,Gland Neoplasms, Salivary,Lymphadenoma, Non-Sebaceous,Lymphadenoma, Salivary Gland,Lymphadenoma, Sebaceous,Lymphadenomas, Non-Sebaceous,Lymphadenomas, Salivary Gland,Lymphadenomas, Sebaceous,Neoplasm, Salivary Gland,Non Sebaceous Lymphadenomas,Non-Sebaceous Lymphadenoma,Salivary Gland Cancers,Salivary Gland Lymphadenoma,Salivary Gland Neoplasm,Sebaceous Lymphadenoma
D013125 Spinal Neoplasms New abnormal growth of tissue in the SPINE. Neoplasm, Spinal,Neoplasms, Spinal,Spinal Neoplasm

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