A Rare Distant Metastasis of Papillary Cystadenocarcinoma Arising from Maxillary Gingiva.

Papillary cystadenocarcinoma is an uncommon disease with low-grade histological and clinical features. Although the tumor has the potential to produce regional lymph node metastasis, there have been no reports of cases with distant metastasis. We describe a case of papillary cystadenocarcinoma arising from the maxilla that developed pulmonary metastasis 3 years after radical surgery of the primary tumor and regional lymph node. The histological findings were confirmed on resected specimens of the pulmonary nodule and a pathological diagnosis of a metastatic lesion derived from papillary cystadenocarcinoma was made. To our knowledge, this is the first report of the development of pulmonary metastasis in a patient with papillary cystadenocarcinoma. The present case suggests that papillary cystadenocarcinoma has the potential to produce lung metastasis in the clinical course. Based on our experience, we emphasize that long-term follow-up and/or careful examination are necessary in patients with cystadenocarcinoma, especially in patients with lymph node metastasis during the initial surgical therapy.

Endoscopic Endonasal Odontoidectomy in the Hybrid Operating Room.

BACKGROUND: The endoscopic endonasal approach for the craniovertebral junction (CVJ), instead of the microscopic transoral approach, has been widely adopted and accepted, especially in resection of the odontoid process for basilar invagination. However, there is concern regarding insufficient resection of odontoid and surgical complications, including vessel injuries, because this is a historically immature procedure. Here, we report a surgical case of endoscopic endonasal odontoidectomy (EEO) in the hybrid operating room (hOR) for improvement of its safety and reliability. CASE DESCRIPTION: A 70-year-old man presented with a 2-month history of myelopathic gait disturbance and swallowing disturbance. Neuroimaging analysis indicated medulla oblongata compression associated with basilar invagination. The patient underwent EEO in the hOR after posterior instrumented fixation. With the hOR, the extent of bone resection and anatomic orientation were confirmed intraoperatively. Postoperative course was uneventful, and symptoms were improved after surgery. CONCLUSIONS: The application of the hOR may make the EEO safe and precise for anterior decompression of the CVJ. To our knowledge, this is the first case report describing clinical experience of EEO in the hOR.