Christine S. Landry

Robot assisted transaxillary surgery (RATS) for the removal of thyroid and parathyroid glands

BACKGROUND Robotic assisted transaxillary surgery (RATS) is a minimally invasive approach for the removal of the thyroid and/or parathyroid glands through the axilla. This anatomically directed technique, popularized by Chung, eliminates a visible scar and affords excellent high definition optics of the cervical anatomy. We report an initial series of single access RATS in the U.S. METHODS The prospective endocrine surgery database at a tertiary care center was used to capture all patients who underwent RATS between October 2009 and March 2010. All procedures were performed using a single transaxillary incision. RESULTS Fourteen operations were performed on 13 patients. Indications for RATS were indeterminate thyroid nodules in 11 patients, the need for completion thyroidectomy in 1 patient, and primary hyperparathyroidism in 2 patients. For patients who underwent robotic assisted thyroid lobectomy, the median thyroid nodule size was 2.1 cm (range, 0.8-2.8 cm), and the median body mass index was 25.33 (range, 21.3-34.4). Mean and median total operative times for robotic assisted thyroid lobectomies were 142 minutes and 137 minutes respectively (range, 113-192 minutes). Operative time for the 2 patients who underwent robotic assisted parathyroidectomy was 115 and 102 minutes. Minor complications occurred in 4 patients (28.5%), with no significant perioperative morbidity or mortality. CONCLUSION RATS is feasible. We believe that further study of the RATS technique for removing thyroid lobes and parathyroid glands is warranted. This initial series suggests that careful, continued investigation is necessary prior to routine implementation into clinical practice across the U.S.

Bilateral Robotic-Assisted Transaxillary Surgery

HYPOTHESIS Robotic-assisted transaxillary surgery (RATS) for the removal of thyroid glands is feasible by surgeons in the United States. DESIGN Case report. SETTING Academic research. Patient A 53-year-old woman. INTERVENTION Total thyroidectomy via the transaxillary approach. MAIN OUTCOME MEASURE Successful completion thyroidectomy using bilateral RATS. RESULTS Right thyroid lobectomy was performed via RATS to remove a 2.2-cm Hurthle cell neoplasm of the thyroid gland per cytologic analysis. Final pathologic analysis was consistent with minimally invasive follicular thyroid carcinoma. The patient then underwent completion thyroidectomy via left-sided RATS. There were no complications. CONCLUSIONS Bilateral RATS to perform total thyroidectomy is a feasible option in properly selected patients. To our knowledge, this is the first reported use of this technique in the United States.

Cystic lymph nodes in the lateral neck as indicators of metastatic papillary thyroid cancer

OBJECTIVE To determine whether radiographic findings portend to metastatic disease in patients with papillary thyroid carcinoma (PTC) and whether cystic lymph node metastasis can be recognized by preoperative, ultrasound-guided fine-needle aspiration (FNA). METHODS We performed a retrospective review of patients with cystic lymph nodes in the lateral neck identified on preoperative ultrasonography between March 1996 and December 2009. Factors examined included demographic information; stage; cytologic and final pathologic findings; and imaging characteristics including location, size, and presence of vascularity and calcifications. Time of cystic node identification in relationship to initial diagnosis was also recorded. RESULTS Thirty patients had cystic lymph nodes in the lateral neck on cervical ultrasonography during the study period. Among this group, 28 (93%) had PTC, 1 (3%) had papillary serous carcinoma of the ovary, and 1 (3%) had poorly differentiated thyroid cancer. Median age at initial cancer diagnosis was 41 years (range, 16-64 years). Twenty-one patients (70%) were women, and median lymph node size was 1.8 cm (range, 0.6-4.8 cm). Twenty-three patients (77%) had a solitary cystic lymph node, and the remainder had more than 1 cystic lymph node. Cystic lymph nodes were identified at initial presentation in 11 patients (37%), while cystic lymph nodes were discovered in 19 patients (63%) after the initial operation. FNA was performed on the cystic lymph nodes of 23 patients (77%). Cytologic findings were positive for metastatic disease in 18 of 23 patients (78%). Among the 5 of 23 patients with negative cytologic findings, thyroglobulin aspirate was obtained in 1 patient, confirming metastatic PTC. Final pathologic review after surgical resection of cystic lymph nodes with negative cytologic findings from FNA was consistent with metastatic disease in 4 of 5 patients (80%). CONCLUSIONS In patients with PTC, the presence of a cystic lymph node by ultrasonographic examination is highly suggestive of locally metastatic disease. Confirmation of metastatic PTC may sometimes be achieved with thyroglobulin aspirate from cystic lymph nodes when cytologic findings are negative. Clinicians should strongly consider surgical lymph node resection of cystic lymph nodes regardless of the preoperative cytologic findings by FNA.

Vitamin D receptors and parathyroid glands.

OBJECTIVE To describe the function and metabolism of the vitamin D hormone and the role of the vitamin D receptor and the calcium-sensing receptor in the secretion of parathyroid hormone. METHODS A review of the literature was undertaken regarding the function and metabolism of vitamin D; the role of the vitamin D receptor and calcium-sensing receptor in the secretion of parathyroid hormone; and the contemporary research regarding the interaction of vitamin D and parathyroid hormone in patients with vitamin D deficiency, primary hyperparathyroidism, and secondary hyperparathyroidism. RESULTS Over the last several years, great interest has been generated about the interaction of vitamin D and the parathyroid glands, gastrointestinal tract, kidney, and bone in relation to calcium and parathyroid hormone levels. Vitamin D has an important role in calcium and parathyroid hormone metabolism. Likewise, the vitamin D axis appears to be involved with the development of both primary and secondary hyperparathyroidism. The specific mechanism by which vitamin D interacts with the parathyroid gland to bring about observed effects is not yet fully understood. CONCLUSION Future studies investigating the relationship of the vitamin D receptor, calcium-sensing receptor, and parathyroid glands are needed to enhance our knowledge of vitamin D deficiency and primary and secondary vitamin D deficiency.

Surgical Management of Nonmultiple Endocrine Neoplasia Endocrinopathies: State-of-the-Art Review

The development of genetic testing has given patients with familial endocrine diseases the opportunity to be identified earlier in life. The importance of this technological advancement cannot be underestimated, as some of these heritable diseases have significant potential for malignancy. This article focuses on the identification and surgical management of familial endocrinopathies of the thyroid, parathyroid, adrenal glands, and pancreas. Familial endocrinopathies discussed include hereditary nonmedullary carcinoma of the thyroid, Cowden disease, familial adenomatous polyposis, Carney complex, Werner syndrome, familial medullary thyroid carcinoma, Pendred syndrome, hereditary hyperparathyroidism jaw-tumor syndrome, familial isolated hyperparathyroidism, Beckwith- Wiedemann syndrome, Li-Fraumeni syndrome, neurofibromatosis I, von Hippel-Lindau disease, and tuberous sclerosis.

Multiple Endocrine Neoplasia

The term “multiple endocrine neoplasia” was first used by Steiner in the late 1960s when he described three distinct endocrine disorders. The first disorder, multiple endocrine neoplasia type I (MEN 1) (also known as Wermer syndrome), described patients with familial pituitary, parathyroid, and pancreatic islet cell tumors. The second syndrome, multiple endocrine neoplasia type II (MEN 2) (also known as Sipple syndrome), was associated with familial pheochromocytomas, medullary thyroid carcinoma (MTC), and hyperparathyroidism. The third syndrome, called multiple endocrine neoplasia type III (MEN 3), included patients with papillary thyroid carcinomas and nonfamilial parathyroid tumors.