Ryohei Yokoyama
Overview
Explore the profile of Ryohei Yokoyama including associated specialties, affiliations and a list of published articles.
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34
Citations
517
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Recent Articles
1.
Ifuku T, Ishikawa Y, Yamashita N, Yokoyama R, Yamaji T, Nakatani K
Int Heart J
. 2023 May;
64(3):506-511.
PMID: 37197916
Tetralogy of Fallot (ToF) is the most common cyanotic congenital heart disease. Cyanotic spells occur more frequently after infancy in unrepaired cases. Acute esophageal necrosis (AEN) is a rare disease...
2.
Ifuku T, Suzuki S, Nagatomo Y, Yokoyama R, Yamamura Y, Nakatani K
BMC Pediatr
. 2022 Jun;
22(1):379.
PMID: 35768799
Background: 22q11.2 deletion syndrome (22qDS) is the most common chromosomal microdeletion syndrome and is associated with a high rate of congenital heart disease (CHD) and neurodevelopmental abnormalities. Congenital portosystemic venous...
3.
Nakagawa M, Endo M, Susuki Y, Yokoyama N, Maekawa A, Nabeshima A, et al.
J Clin Med
. 2022 Apr;
11(7).
PMID: 35407670
Periosteal chondrosarcoma is an extremely rare malignant cartilage-forming tumour that originates from the periosteum and occurs on the surface of bone. Often, it is difficult to distinguish periosteal chondrosarcoma from...
4.
Chin M, Yokoyama R, Sumi M, Okita H, Kawai A, Hosono A, et al.
Pediatr Blood Cancer
. 2020 Feb;
67(5):e28194.
PMID: 32077253
Background: The survival rate in patients with Ewing sarcoma family of tumors (ESFT) in Japan was reported to be < 50% in the 1990s. The Japan Ewing Sarcoma Study Group...
5.
Toya M, Yamada Y, Yokoyama R, Taguchi K, Nabeshima K, Isayama T, et al.
Pathol Res Pract
. 2020 Feb;
216(4):152832.
PMID: 32057514
Low-grade central osteosarcoma (LG-COS) is an uncommon variant of osteosarcoma (OS) that sometimes progresses to high-grade OS post-recurrence. We herein present a case of dedifferentiated LG-COS with extensive cystic change...
6.
Sugimachi K, Iguchi T, Ohta M, Mano Y, Hisano T, Yokoyama R, et al.
BMC Surg
. 2020 Feb;
20(1):24.
PMID: 32013941
Background: We report a case of an intraabdominal desmoid tumor that occurred at a gastro-pancreatic lesion with spontaneous cystic features, and present the successful laparoscopic resection of the tumor. Case...
7.
Tanaka K, Mizusawa J, Naka N, Kawai A, Katagiri H, Hiruma T, et al.
BMC Cancer
. 2019 Sep;
19(1):890.
PMID: 31492159
Background: Soft-tissue sarcomas (STS) are rare malignant tumors those are resistant to chemotherapy. We have previously reported the 3-year follow-up result on the efficacy of perioperative chemotherapy with doxorubicin (DXR)...
8.
Nagano A, Matsumoto S, Kawai A, Okuma T, Hiraga H, Matsumoto Y, et al.
J Orthop Sci
. 2019 Jun;
25(2):319-323.
PMID: 31155441
Background: Primary osteosarcoma in elderly patients are rare malignant tumors. Its optimal treatment has not yet been determined. Methods: This retrospective study included 104 patients aged >50 years with resectable,...
9.
Tanaka K, Ogawa G, Mizusawa J, Naka N, Kawai A, Takahashi M, et al.
World J Surg Oncol
. 2018 Aug;
16(1):162.
PMID: 30097070
Background: Soft tissue sarcomas (STS) are rare malignant tumors. The efficacy of preoperative chemotherapy for STS is evaluated using various tumor size-based radiological response criteria. However, it is still unclear...
10.
Akazawa M, Saito T, Ariyoshi K, Okadome M, Yokoyama R, Taguchi K
J Obstet Gynaecol Res
. 2018 Jul;
44(10):2008-2015.
PMID: 30051552
A primitive neuroectodermal tumor (PENT) belongs to the category of a Ewing sarcoma. A PENT of the uterus is rare and has been known to be very aggressive by nature....