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Affiliation |
Graduate School of Medicine Doctorial Course in Medicine Organ Function-Oriented Medicine Department of Pediatric Surgery |
WATANABE Ryo
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Graduating School 【 display / non-display 】
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-2008.03
Akita University Faculty of Medicine Graduated
Graduate School 【 display / non-display 】
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-2021
Akita University Graduate School, Division of Medicine Doctor's Course Other
Campus Career 【 display / non-display 】
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2021.08-Now
Akita University Graduate School of Medicine Doctorial Course in Medicine Organ Function-Oriented Medicine Department of Pediatric Surgery Assistant Professor
Research Achievements 【 display / non-display 】
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Solid-pseudopapillary pancreatic neoplasm incidentally diagnosed in an 8-year-old boy: A case report
Watanabe Ryo, Yamagata Kenki, Morii Mayako, Azuma Saya, Hayashi Kaito, Mizuno Masaru
The Japanese Journal of Pediatric Hematology / Oncology ( The Japanese Society of Pediatric Hematology / Oncology ) 60 ( 5 ) 377 - 380 2023
<p>A solid pseudopapillary neoplasm (SPN) of the pancreas is a low-grade malignancy that usually occurs in young women, and surgical excision remains the first-choice treatment. We describe a boy who was incidentally diagnosed with a pancreatic tumor with a high index of clinical suspicion for a pancreatic SPN, during follow-up after congenital biliary dilatation. However, considering that the patient was asymptomatic and that this tumor is rare in male children, he underwent follow-up without further evaluation. The tumor showed enlargement, and enucleation was performed, 2 years later. Intraoperatively, we observed no invasion or metastasis to other organs; however, we should reflect on that. Contrast-enhanced ultrasonography was useful for differentiation of this lesion from other pancreatic tumors.</p>
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Mesenteric Lipoma in a Child: An Unusual Cause of Recurrent Abdominal Pain and Failure to Thrive
Suganuma Rie, Yoshino Hiroaki, Morii Mayako, Hebiguchi Taku, Watanabe Ryo, Azuma Saya, Yamagata Kenki, Hayashi Kaito, Mizuno Masaru, Ohtsuka Mihoko
Journal of the Japanese Society of Pediatric Surgeons ( The Japanese Society of Pediatric Surgeons ) 56 ( 7 ) 1150 - 1155 2020
<p>Mesenteric lipomas are relatively rare, benign tumors in children. We present a case of mesenteric lipoma in a child with symptoms of partial bowel obstruction, diagnosed preoperatively via abdominal ultrasonography, computed tomography (CT), and magnetic resonance imaging (MRI). A 7-year-old boy with a history of recurrent abdominal pain and failure to thrive presented with symptoms of vomiting over the last four days. Physical examination revealed slight abdominal distention without a palpable mass. Plain abdominal radiography revealed small bowel loop distention, with a flat, dilated junction segment, indicating mechanical intestinal obstruction. Ultrasonography revealed a heterogenous echogenic mass lesion within the pelvic cavity. CT revealed a well-encapsulated nonenhancing mass with nodular organization and negative attenuation values. T1- and T2-weighted MRI sequences revealed that the mass showed hypersignal intensities and was mobile, which are indicative of mesenteric lipoma. Laparotomy revealed a smooth, round, soft, yellow mass measuring approximately 8.5×8.0×3.0 cm, arising from the mesentery, 80 cm proximal to the ileocecal valve. Resection of the affected segment of the ileum and end-to-end ileal anastomosis were performed. Histopathological analysis showed that the tumor was composed of mature adipocytes without atypia, confirming the diagnosis of mesenteric lipoma. The findings were negative for malignancy. No recurrence was observed during the two-year postoperative follow-up. The clinical presentation of the case was indicative of partial obstruction due to compression with spontaneous detorsion. Mesenteric lipoma should be considered a possible differential diagnosis in children with recurrent abdominal pain and failure to thrive.</p>
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A Case of Generalized Lymphatic Anomaly After 17 Years of Sclerotherapy for Lymphatic Malformation
Watanabe Ryo, Yoshino Hiroaki, Morii Mayako, Hebiguchi Taku, Azuma Saya, Yamagata Kenki
Journal of the Japanese Society of Pediatric Surgeons ( The Japanese Society of Pediatric Surgeons ) 55 ( 5 ) 988 - 992 2019
<p>The patient was a 17-year-old male. A congenital giant cystic lesion on the neck was detected prenatally, and he was diagnosed as having cervical cystic lymphatic malformation postnatally. Two rounds of sclerotherapy were performed during infancy. The cyst size was markedly reduced. At 4 years of age, he underwent surgical removal of the excess skin at the Department of Plastic Surgery, and the swelling in the neck improved. Thereafter, he discontinued outpatient visits on his own and no follow-up was conducted. When he had a fracture of the cervical spine during baseball practice at 17 years of age, multiple cystic lesions in the bone were detected. MRI indicated no recurrence of the cervical cystic lesion but multiple cystic lesions in the cervical spine, thorax, ribs, iliac bone, and spleen were detected; thus, he was diagnosed as having generalized lymphatic anomaly (GLA). Bone union occurred later at the fracture site of the cervical spine. No pleural effusion, cardiac effusion, or ascites were noted, and blood analysis showed no abnormality. Therefore, he is currently under follow-up with no treatment. Cystic lymphangioma is currently defined as lymphatic malformation due to developmental disorders of lymphatic vessels. The present case was classified as a macrocystic-type lymphatic malformation and considered to belong to a disease group different from GLA, which is a systemic disease. However, GLA may develop during the course, as in this case, and long-term follow-up in addition to diagnosis and treatment may be warranted.</p>
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Congenital Cervical Salivary Fistula From the Submandibular Gland
Morii Mayako, Hebiguchi Taku, Watanabe Ryo, Azuma Saya, Yamagata Kenki, Yoshino Hiroaki
Journal of the Japanese Society of Pediatric Surgeons ( The Japanese Society of Pediatric Surgeons ) 53 ( 7 ) 1316 - 1319 2017
<p>An otherwise healthy two-year-old boy was referred to our department with intermittent mucous drainage from the fistula in the middle of the inside margin of the sternocleidomastoid muscle after birth. Fistulography revealed that the fistula was branched and limited to the submandibular triangle. This tract originated from the normal left submandibular gland. The lesion was explored surgically by spindle incision surrounding the orifice and the fistula was dissected up to the submandibular gland. Wharton's duct was opened normally at the sublingual caruncle. The postoperative course was uneventful. Histological examination revealed a sero-mucinous salivary gland with the ducts lined by stratified squamous epithelium consistent with congenital salivary fistula.</p>