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Erschienen in: BMC Surgery 1/2018

Open Access 01.12.2018 | Case report

Robotic enucleation for pediatric insulinoma with MEN1 syndrome: a case report and literature review

verfasst von: Mei Liang, Jialin Jiang, Hongmei Dai, Xiafei Hong, Xianlin Han, Lin Cong, Anli Tong, Fang Li, Yaping Luo, Weinan Liu, Liangrui Zhou, Wenyu Di, Wenming Wu, Yupei Zhao

Erschienen in: BMC Surgery | Ausgabe 1/2018

Abstract

Background

A patient with a rare pediatric insulinoma and MEN1 syndrome was treated by robotic enucleation surgery.

Case presentation

We present a case of a 9-year-old girl presenting with repeated loss of consciousness, concomitant with a pale face, palpitations, and convulsions, which had persisted for 2 years and had been aggravated during the previous 2 months. She was previously misdiagnosed with epilepsy in another hospital. We further examined her while she was hospitalized. By combining her medical history and imaging examination and lab test results, a diagnosis of insulinoma was confirmed. Sanger-directed sequencing on a peripheral blood sample revealed an MEN1 gene mutation, indicating pediatric insulinoma with MEN1 syndrome. The patient underwent minimally invasive insulinoma enucleation surgery under the Da Vinci robot-assisted system with intraoperative ultrasound (IOUS) connected. The surgery was successfully completed within 65 min, and the girl recovered well postoperatively and no longer experienced symptoms of hypoglycemia.

Conclusion

This is the first report of a case of pediatric insulinoma treated using robotic enucleation. This experience demonstrates the feasibility and safety of combining robotic surgery with the enucleation procedure as an excellent strategy for pediatric insulinoma.
Hinweise
Mei Liang, Jialin Jiang and Hongmei Dai contributed equally to this work.
Abkürzungen
ASVS
Selective arterial calcium stimulation and hepatic venous sampling of insulin
MEN1
Multiple endocrine neoplasia type 1
N/A
Data not available
PET-CT
Positron Emission Tomography-Computed Tomography
POD
Postoperative day
POPF
Increase postoperative pancreatic fistula
THPVS
Transhepatic portal venous sampling

Background

Insulinomas are insulin-secreting pancreatic neuroendocrine tumors (pNETs) that affect an estimated 1 in 250,000 people per year. The median age of patients at presentation is approximately 47 years, and insulinomas seldom occur in pediatric patients [1]. Due to excess insulin secretion, patients with insulinomas have recurrent hypoglycemia. Such patients usually present with Whipple’s triad, which consists of hypoglycemia, neuroglycopenic symptoms, and symptom relief with glucose administration. Nearly 10% of insulinomas occur in the context of MEN1, an autosomal dominant disorder. More than 1300 mutations in MEN1 have been reported, and most of these mutations likely disrupt the interactions of the menin protein with other proteins, thus altering critical events in cell cycle regulation and proliferation [2]. Additionally, MEN1 mutations are more common in insulinomas in children than in adults [3]. Diagnoses of insulinoma can be challenging because of the presence of nonspecific symptoms. Surgical resection is the best choice for most patients. In this paper, we describe a patient with pediatric insulinoma and MEN1 syndrome. Traditionally, open surgery has been the main surgical choice for such a pediatric patient. Recently, minimally invasive surgery has been adopted to treat insulinoma. Ming-Gen et al. recently used robotic spleen-preserving distal pancreatectomy to treat pediatric insulinoma [4]. Our surgical center was the first to report a study on robotic enucleation for small pancreatic neuroendocrine tumors in adults [5]. Here, we present robotic enucleation for a pediatric insulinoma patient with MEN1 syndrome. To the best of our knowledge, this is the first reported robotic enucleation surgery for pediatric insulinoma.

Case presentation

A 9-year-old girl was admitted due to repeated loss of consciousness, concomitant with a pale face, palpitations, and convulsions, which had persisted for 2 years and had been aggravated during the previous 2 months. These symptoms occurred automatically. The patient denied experiencing any sweating, nausea, vomiting, trembling, or an obvious sense of hunger before meals. The patient was previously misdiagnosed with epilepsy in another hospital, but no abnormal findings were detected on a 24-h electroencephalogram at our hospital. Her abdominal perfusion CT showed a highly perfused nodule within the pancreatic tail; A magnetic resonance scan confirmed the location of this nodule and indicated that its size was 11.6 × 13.2 mm (Fig. 1a-f). Additionally, 68Ga-exendin 4 PET-CT showed a region in the pancreatic tail with abnormally high metabolism and overexpression of the glucagon-like peptide-1 receptor (Fig. 1g-i). Lab testing showed a low fasting blood glucose (BG) of 2.2 mmol/L (reference range: 3.9–6.1 mmol/L), a high proinsulin level of 4455.9 pg/mL (reference range: 30–180 ng/mL), a normal C-peptide level of 2.56 ng/mL (reference range: 0.8–4.2 ng/mL), a serum insulin level of 15.35 μIU/mL (reference range: 5.2–17.2 μIU/mL), and a gastrin level of 92.6 pg/mL (reference range: < 100 pg/mL). These results confirmed a diagnosis of insulinoma. Imaging examination showed no abnormalities indicative of parathyroid adenoma or malignancy in the pituitary or adrenal glands. Lab testing showed normal levels of parathyroid hormone (PTH), blood calcium, phosphate, follicle-stimulating hormone (FSH), growth hormone (GH), prolactin (PRL), adrenocorticotropic hormone (ACTH), 24-h urinary free cortisol (24 hUFC), and serum cortisol. Her luteinizing hormone (LH) level was 0.24 IU/L (reference range: 2.12–10 IU/L during the follicular phase), which was considered related to her age.
Preoperative preparation: To avoid recurrent symptoms and to maintain her fasting BG at a tolerably low level, the patient was given regular snacks before bedtime. BG can be controlled at a level between 50 and 60 mg/dL preoperatively.
Surgical procedure: The patient underwent minimally invasive insulinoma enucleation surgery under the Da Vinci robot-assisted system with intraoperative ultrasound (IOUS) connected. The patient was put in a head-low, feet-high and left-lateral position. The robotic system was positioned at the head of the patient, while the assistant surgeon stood between the patient’s legs. Abdominal exploration via laparoscopy was conducted, and no obvious abnormalities were found. The robotic lens and operating arms were docked. The gastrocolic ligament was dissected with an ultrasonically activated scalpel. The head of the pancreas was exposed by grasping the colon downward and lifting the stomach. Towards the tail of the pancreas, we separated and exposed the spleen. The surgeon then controlled the ultrasound probe, exploring the tumor from the pancreatic tail to the head and the uncinated process with the assistance of a prograsp clamp. A quasi-circular, hypoechoic lesion was found at the end of the pancreas with a diameter of approximately 10 mm and a clear boundary. We marked the normal pancreatic tissue around the lesion with an electrotome, and while dividing the pancreas sequentially, suction was used continually to visualize the tumor capsule. Precise positioning was achieved using IOUS, and the tumor was completely resected along the capsule (Fig. 2a-c). A peritoneal drainage tube was placed. The surgery went well, lasting 65 min (skin to skin), and the volume of intraoperative bleeding was 5 mL. Intraoperative BG is documented in Table 1.
Table 1
Intraoperative blood glucose monitoring
Time (minutes)
Blood Glucose (mg/dL)
Prior to tumor removal
59.4
Immediately following removal of the tumor
68
15 min after tumor resection
82.8
30 min after tumor resection
90
40 min after tumor resection
75.6
60 min after tumor resection
90
After surgery, the patient was given liquid diet on POD2. The drain was clean and was removed on POD4, and the patient gradually resumed her normal diet. She was discharged to home on POD6. During the following 1.5 years, the patient had no recurrence of the disease. No postoperative complication occurred, such as pancreatic fistula or pancreatic function deficiency.
Pathological examination showed that the tumor was a pancreatic neuroendocrine tumor (Grade 2 with a Ki-67 index of 4%) (Fig. 2d-e). This tumor was positive for CgA, Syn, and AE1/AE3 (Fig. 2f-h). Insulin staining was partially positive (Fig. 2i), while gastrin, glucagon, and somatostatin staining were negative (Fig. 2j-l).
Sanger-directed sequencing for the MEN1 gene mutation was performed on a peripheral blood sample, revealing a homozygous pathogenic mutation of c247_250delCTGT (p.Ile85Serfs*33) (Fig. 3). This point mutation was also detected in the frozen tissue of the patient.

Discussion and conclusion

Insulinoma is the most common type of pNET, and such tumors seldom occur in pediatric patients [6]. Recently, we searched all of the literature regarding pediatric insulinoma from the past 10 years and summarized the characteristics of 65 cases in 16 studies (Table 2) [4, 721].
Table 2
Published Cases (Surgery*: Details of surgery not mentioned)
Publication year
Author
Country
Number
Age, years
Diagnosis
Main location method
Tumor size (cm)
Lesion location
Treatment
2017
Ming-Gen Hu [4]
China
1
9
Solitary
MRI
2
Tail
Robotic distal pancreatectomy
2017
Esposito C [7].
Italy/UK/Netherlands/France
4
0.16–4
Solitary
CT, 18F-DOPA PET/CT
N/A
Body/tail
Laparoscopic
2016
Miron I [8]
Romania
1
11
Solitary
MRI
1
Tail
Open surgery
2016
Bhatti TR [9]
America
12
4–16
Multiple: 2; MEN1: 5
N/A*
0.7–2
Head/neck/midbody/tail/ splenic hilum
Diazoxide, surgery*
2015
Nasher O [10]
UK
3
0.09–10
Solitary: 2; Multiple: 1
N/A
N/A
Head/tail
Laparoscopic to open surgery: 1; open surgery: 2
2015
Smith A [11]
USA
1
14
Solitary
ASVS
2.1
Neck
Diazoxide, surgery*
2014
Gozzi Graf T [12]
Switzerland
2
11.3–13.6
Solitary: 1
MRI, ASVS*
1.2–2.5
Head
Laparoscopic: 1; open surgery: 1
2014
Padidela R [13]
UK
9
2–14.5
Multiple: 1; MEN1: 2
MRI/18F-DOPA PET/CT
0.8–2
Head/uncinate process/tail
Diazoxide, surgery*
2014
Kundel A [14]
Ireland
6
12–18
N/A
N/A
N/A
Tail
Surgery*
2013
Horváth E [15]
Romania
1
16
Solitary
CT
1.6 cm
Tail
Surgery*
2013
Peranteu WH [16]
USA
8
Mean: 11
Solitary: 7; Multiple: 1; MEN1: 1
U/S, CT, MRI, endoscopic U/S, ASVS, THPVS*, 18F-DOPA PET/CT
0.3–1.8
Head/neck/body/tail
Open surgery
2012
Sakusai A [17]
Japan
13
< 20
Solitary/multiple, all MEN1
N/A
0.15–9.4
Head/body/tail
Laparoscopic/open surgery
2012
Ide S [18]
Japan
1
13
Solitary
Enhanced CT
1.9
Head
Open surgery
2010
Janem W [19]
Jordan
1
12
Malignant
CT
N/A
Widely metastatic
Octreotide, diazoxide
2008
Shah SR [20]
India
1
13
Multiple
N/A
2
Tail
Surgery*
2007
Bonfig W [21]
Germany
1
12.5
Solitary
Endosongraphy
1.5
Tail
Laparoscopic
Among the cases in the past decade that we reviewed, distal pancreatectomy and pancreaticoduodenectomy were the most common therapeutic procedures. Only 4 enucleations were performed, including 3 open and 1 laparoscopic. Notably, one patient underwent robotic distal pancreatectomy in 2017, which was the first application of a robotic surgery system in pediatric insulinoma treatment.
Imaging examination is an essential step for preoperative confirmation and localization of an insulinoma. In our case, we used two advanced methods for localization which have improved the accuracy of diagnosis significantly: 68Ga-DOTANOC PET/CT and laparoscopic ultrasound (LUS). An examination of pNET diagnosis and staging data from 141 patients indicated that the overall sensitivity, specificity, and accuracy of 68Ga-DOTANOC PET/CT for diagnosing patients with pancreatic neuroendocrine tumors were 85.7, 79.1, and 84.8%, respectively [22]. Meanwhile, in a study by Li et al., intraoperative LUS alone detected all insulinoma tumors with 100% sensitivity and 100% specificity [23].
In the past, pancreaticoduodenectomy and pancreatectomy have generally been the standard operative procedures for benign and borderline pancreatic tumors, but they seem excessive because of the increased risk of postoperative endocrine and exocrine insufficiency owing to wide resection of the pancreatic parenchyma. Patients undergoing partial resection had a higher rate of new postoperative diabetes and more use of pancreatic enzymes postoperatively than those who receiving pancreatic enucleation [24] .
Therefore, enucleation appears to be a better option as an effective therapeutic procedure for such tumors, allowing preservation of long-term pancreatic function while achieving favorable oncological outcomes [25]. Previous reports have shown that enucleation allows a more limited excision extent, thus offering several advantages in terms of function conservation, blood loss and surgical time [26], all of which are especially important for children whose normal parenchyma is still developing. Additionally, many studies have confirmed the low recurrence rate after enucleation of benign or low-grade malignant tumors. No significant difference is evident in prognosis of patients with insulinoma between groups of enucleation and partial pancreatic resection [27].
Specific indications for pancreatic tumor enucleation are as follows: benign, isolated lesions with a distance between the tumor and the main pancreatic duct ≥3 mm (no focal stricture or dilation), insulinomas, gastrinomas < 2 cm, and nonfunctional pancreatic neuroendocrine tumors (NF-pNETs) < 1–2 cm with a low Ki67 mitotic index [28]. Insulinomas < 2 cm are ideal candidates for enucleation, especially considering their 80% probability of being benign [28].
The Da Vinci Surgical System enables robot-assisted surgery, which provides surgeons with a three-dimensional view, high articulation ability, scaling functions, filtering functions to avoid shaking, and visual magnification. When it comes to pancreatic surgery, several studies have reported the advantages of robotic approach over conventional laparoscopic means, such as less rate of conversion to laparotomy, less blood loss and shorter postoperative hospital stay [29, 30]. However, enucleation of pNETs via robotic surgery has been described only a few times worldwide. Recently, our surgical center reported that robotic surgery for enucleation of pNETs smaller than 2 cm did not increase postoperative pancreatic fistula (POPF) or major complication rates and reduced the duration of surgery and estimated blood loss when compared with open surgery [5]. ,Robotic enucleation provides the dual benefits of minimal invasiveness and good pancreatic parenchymal conservation. Notably, for children, considering their poor tolerability for operative trauma and anesthesia, demands for a faster and less traumatic surgical procedure are increasing. Therefore, robotic enucleation is considered an ideal strategy for pediatric insulinomas meeting the operative indications.
This is the first case of pediatric insulinoma treated via robotic enucleation in the world. The operation was completed in 65 min (skin to skin) with only 5 mL of blood loss. No POPF occurred after surgery. The patient recovered well and was discharged home on POD 6. During the following 1.5 years, she had no recurrence of the disease nor experienced her previous symptoms of hypoglycemia. No postoperative complication occurred, such as pancreatic fistula or pancreatic function deficiency. This experience has demonstrated the feasibility and safety of the robotic enucleation procedure, with an excellent curative effect for pediatric insulinoma.

Acknowledgements

We thank Dr. Dandan Hu from the Chinese Academy of Medical Science & Peking Union Medical College and Xue Sun from the Department of Special Medicine of Beijing Hospital for their great contributions to the manuscript.

Funding

This work was supported by grants from The National Natural Science Foundation of China (81573009 and 81603157), Preeminent Youth Fund of Peking Union Medical College Hospital (JQ201507), Youth Fund of Peking Union Medical College Hospital (pumch-2016-2.22), and Chinese Academy of Medical Sciences Initiative for Innovative Medicine (2017-12 M-1-001).

Availability of data and materials

The data supporting the findings of this study are available from Peking Union Medical College Hospital, but restrictions apply to the availability of these data, which were used under license for the current study and are not publicly available. However, the data are available from the authors upon reasonable request and with permission from Peking Union Medical College Hospital.
This study has been approved by the Institutional Ethics Committee of PUMCH, Chinese Academy of Medical Sciences and conforms to the principles expressed in the Declaration of Helsinki.
Written informed consent was obtained from the patient and her legal guardians for publication of this case report and any accompanying images.

Competing interests

The authors declare that they have no competing interests.

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Metadaten
Titel
Robotic enucleation for pediatric insulinoma with MEN1 syndrome: a case report and literature review
verfasst von
Mei Liang
Jialin Jiang
Hongmei Dai
Xiafei Hong
Xianlin Han
Lin Cong
Anli Tong
Fang Li
Yaping Luo
Weinan Liu
Liangrui Zhou
Wenyu Di
Wenming Wu
Yupei Zhao
Publikationsdatum
01.12.2018
Verlag
BioMed Central
Erschienen in
BMC Surgery / Ausgabe 1/2018
Elektronische ISSN: 1471-2482
DOI
https://doi.org/10.1186/s12893-018-0376-5

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