Weekly Case

Title : Case 703

Age / Sex : 61 / M


Chief complaint : Left medial elbow pain for 2 years


What is your diagnosis?

Two weeks later, you can see the final diagonosis with a brief discussion of this case (Please submit only one answer).


Courtesy : 
김완태 ( Wan Tae Kim ), 중앙보훈병원 ( Veterans Health Service Medical Center )


 


Diagnosis:

Anconeus epitrochlearis (Accessory muscle)



Discussion


Findings:


Axial and coronal MR images shows well demarcated soft tissue mass like lesion of isointense signal intensities compared with the skeletal muscles, superficial to the cubital tunnel.


                                                                                                                                    


Diagnosis:  


Anconeus epitrochlearis (Accessory muscle)


 


Discussion:


Anconeus epitrochlearis muscle is a congenial accessory muscle that originates from the medial humeral epicondyle and attaches to the medial side of the olecranon. It is also known as the accessory anconeus muscle or epitrochleoanconeus muscle and should not be confused with the anconeus muscle which is present at the lateral aspect of the elbow.


The prevalence has ranged from 4% to 34% in cadaveric studies. The anconeus epitrochlearis muscle is usually seen bilaterally.


It can be asymptomatic or symptomatic when there is compression of the ulnar nerve within the cubital tunnel, leading to ulnar neuritis.


 


References:



  1. Morgenstein A, Lourie G, Miller B. Anconeus epitrochlearis muscle causing dynamic cubital tunnel syndrome: a case series. J Hand Surg Eur Vol. 2016 Feb;41(2):227-229.

  2. Stein JM, Cook TS, Simonson S et al. Normal and variant anatomy of the elbow on magnetic resonance imaging. Magn Reson Imaging Clin N Am. 2011;19(3):609-619.

  3. Sookur PA, Naraghi AM, Bleakney RR et al. Accessory muscles: anatomy, symptoms, and radiologic evaluation. Radiographics. 2008;28(2):481-499.



Correct Answer
Total applicants 31 Correct answers 26
Name Institution
최형인 군의관, 전문의
윤유성 순천향대 부천병원, 전문의
이규정 국군대전병원, 전문의
한유비 전문의
김기욱 전문의
김동언 서울아산병원, 전문의
이혜란 전문의
여현정 전문의
조영민 전문의
전인환 전문의
박영태 충북대학교병원, 전공의
이진영 전문의
김유진 전문의
강지희 전문의
이승보 서울아산병원, 전문의
김동현 단국대학교병원, 전공의
한진우 고려대학교 구로병원, 전문의
김철영 이춘택병원, 전문의
변홍권 서울아산병원, 전문의
권기언 서울아산병원, 전문의
노근탁 전문의
김형민 연세의대 강남세브란스병원, 전문의
윤소진 분당서울대병원, 전문의
김성진 365병원, 전문의
이현규 전문의
정치형 단국대학교병원, 전공의


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