Oxford City Publishers

Article Details

Case Report
Volume 2, Issue 2 (November Issue)

Myxoma in the Supinator Muscle with Transient Postoperative Posterior Interosseous Nerve Palsy: A Case Report

Masaaki Mawatari1, Shuhei Takeshita2*, Yosuke Oba2 and Yoshimasa Fujii2

1Rheumatology Unit, Saga University, Nabeshima, Saga, Japan
2Department of Orthopaedic Surgery, Faculty of Medicine, Saga University, Nabeshima, Saga, Japan

*Corresponding author: Shuhei Takeshita, Department of Orthopaedic Surgery, Faculty of Medicine, Saga University, Nabeshima, Saga, Japan. E-mail: Takeshitaortho.surgery@ditto.ac.jp

Received: March 27, 2023; Accepted: April 10, 2023; Published: May 05, 2023

Citation: Mawatari M, Takeshita S, Oba Y, Fujii Y. Myxoma in the Supinator Muscle with Transient Postoperative Posterior Interosseous Nerve Palsy: A Case Report. Case Rep Orthop Surg J. 2023; 2(2): 115.

Article Image
Abstract

Background: Intramuscular myxomas are rare, benign mesenchymal tumors in the musculoskeletal system, and usually, the tumors arise in the large muscles of the thigh, buttocks, shoulder, and upper arm. However, a tumor of the forearm is very rare. Herein, we describe the case of an intramuscular myxoma in the supinator muscle of a 56-year-old female patient.

Case Presentation: Magnetic resonance imaging showed a well-defined mass that was hypointense with the peritumoral fat ring sign. The differential diagnoses might have been myxoma, schwannoma. The histopathological image showed abundant myxoid tissue, hypocellularity, and poor vascularization. The cells of the tumor were spindle and stellate-shaped with normochromic nuclei. Based on these findings, the pathological diagnosis was an intramuscular myxoma. After excising the tumor, the patient had transient posterior interosseous nerve palsy.

Conclusion: This tumor is curative by resection in toto; however, when the tumor exists in the forearm, surgeons should be careful to avoid damaging surrounding tissues because the tumor is very hard and relatively large compared to the forearm.

Keywords: Intramuscular myxoma; Supinator muscle; Posterior interosseous nerve