MR findings of avulsive cortical irregularity of the distal femur

Avulsive cortical irregularity, a benign condition occurring only among children and adolescents, has been known to simulate malignancy not only radiologically but also microscopically. Therefore, in addition to plain radiographs, further studies including by magnetic resonance (MR) imaging may occa...

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Bibliographic Details
Published in:Skeletal radiology 1995, Vol.24 (1), p.43-46
Main Authors: YAMAZAKI, T, MARUOKA, S, TAKAHASHI, S, SAITO, H, TAKASE, K, NAKAMURA, M, SAKAMOTO, K
Format: Article
Language:English
Subjects:
Adolescent
Biological and medical sciences
Bone Diseases - diagnosis
Bone Diseases - diagnostic imaging
Bone Neoplasms - diagnosis
Child
Contrast Media
Diagnosis, Differential
Diseases of the osteoarticular system
Female
Femur - diagnostic imaging
Femur - pathology
Humans
Image Enhancement
Knee Joint - pathology
Magnetic Resonance Imaging
Male
Medical sciences
Miscellaneous. Osteoarticular involvement in other diseases
Muscle, Skeletal - diagnostic imaging
Muscle, Skeletal - pathology
Osteosclerosis - diagnosis
Osteosclerosis - diagnostic imaging
Retrospective Studies
Tomography, X-Ray Computed
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Summary:Avulsive cortical irregularity, a benign condition occurring only among children and adolescents, has been known to simulate malignancy not only radiologically but also microscopically. Therefore, in addition to plain radiographs, further studies including by magnetic resonance (MR) imaging may occasionally be required. MR images of seven cases of avulsive cortical irregularity of the femur were reviewed. In all cases, the lesion appeared hypointense on T1-weighted images and hyperintense on T2-weighted images, with a dark rim on both sequences at or near the sites of the bony attachment of the medial head of the gastrocnemius muscle. In all cases, bilateral involvement was demonstrated by plain radiography, computed tomography, and/or MR imaging. The authors suggest that avulsive cortical irregularity involves both femora much more frequently than has been reported previously.
ISSN:0364-2348
1432-2161
DOI:10.1007/BF02425946