The peroneocalcaneus internus muscle: MR imaging features.
OBJECTIVE
The peroneocalcaneus internus muscle is a rare muscle of the posterior calf that to our knowledge has not been reported in the radiology literature. The purpose of our study was to describe the normal anatomy and MR characteristics of this muscle in eight patients in whom the muscle was identified.


CONCLUSIONS
The peroneocalcaneus internus muscle is a rare muscle that originates from the inner aspect of the distal fibula, descends within the tarsal tunnel, and inserts on a small tubercle in the calcaneus, just distal to the sustentaculum tali. The muscle may displace the flexor hallucis longus muscle medially and thus indirectly encroach on the neurovascular bundle.
Mellado
J M
JM
Department of Radiology, Hospital for Joint Diseases Orthopaedic Institute, New York, NY 10003, USA.
Rosenberg
Z S
ZS
Beltran
J
J
Colon
E
E
D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007866:Leg; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000002:abnormalities* / Q000033:anatomy & histology; D012189:Retrospective Studies