Weekly Case

Title : Case 783

Age / Sex : 51 / F

Chief complaint : Left knee pain

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 : 최자영(Ja-Young Choi), 서울대학교병원(Seoul National University Hospital)


Desmoplastic fibroblastoma (=Collagenous fibroma) with calcification



1.Intratumoral calcifications with random distribution in the prefemoral fat pad

2.Dark-signal sub-synovial soft tissue mass in the prefemoral fat pad on T1WI & T2WI.

3.Dark-signal with some blooming on GRE sequence

4.Inhomogeneous contrast enhancement on postcontrast images.

Differential diagnosis

  Tenosynovial giant cell tumor, localized type


1.Desmoplastic Fibroblastoma: An Uncommon Tumor With a Relatively Characteristic MRI Appearance. AJR 2020;215: 178-183

2.Calcified desmoplastic fibroblastoma of the foot: imaging findings. Skeletal Radiol 2017 Apr;46(4):565-569

Correct Answer
Total applicants 38 Correct answers 1
Name Institution
이준영 공보의, 전문의
Semi-Correct Answer
Total applicants 38 Semi-Correct answers 11
이규정 국군수도병원, 전문의
최형인 전문의
박소연 일산백병원, 전공의
이진영 전문의
김민혜 전공의
도윤아 전공의
권은영 전문의
김지현 전문의
박혜주 순천향대학교 부천병원, 전공의
조황희 군의관, 전문의
권기언 전문의