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Related Concept Videos

Muscles that Move the Forearm01:16

Muscles that Move the Forearm

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The muscles that move the forearms can be divided into four groups: forearm flexors, forearm extensors, forearm pronators, and forearm supinators. The flexors and extensors act on the elbow joint, while the pronators and supinators act on the radioulnar joints.
Forearm Flexors
The biceps brachii, brachialis, and brachioradialis are forearm flexors. The biceps brachii is made up of two heads. Its long head originates at the supraglenoid tubercle of the scapula, whereas that of the short head is...
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The muscles of the forearm that move the wrist, hand, and digits are numerous and diverse. They can be classified into two groups based on their location and function — the anterior and posterior compartment muscles.
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Related Experiment Video

Updated: Feb 9, 2026

Testing Tactile Masking between the Forearms
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Osteolipoma in the Forearm.

Natalie Siu Kwan Ip1, Hon Wai Lau1, Wai Yu Wong1

  • 1Department of Radiology, Tuen Mun Hospital, Tuen Mun, Hong Kong.

Journal of Clinical Imaging Science
|June 5, 2018
PubMed
Summary

A rare osteolipoma, a benign tumor with bone and fat, was found in a 56-year-old woman's wrist. This case highlights osteolipoma as a key differential diagnosis for wrist masses containing fat and ossification.

Keywords:
Adipocytic neoplasmforearmlipomaossifying lipomaosteolipoma

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Area of Science:

  • Orthopedic Surgery
  • Pathology
  • Radiology

Background:

  • Osteolipoma is a rare benign tumor characterized by mature bone and adipose tissue.
  • Lipomas are common soft tissue tumors, but osteolipomas represent a distinct subtype with osseous metaplasia.
  • Differential diagnosis for soft tissue masses, particularly those with calcifications, requires careful consideration of rare entities.

Observation:

  • A 56-year-old female presented with a 3-year history of a non-tender left distal forearm and wrist mass.
  • Radiographic imaging revealed a lobulated mass with mixed low density and calcifications, separate from the underlying bone.
  • Ultrasound demonstrated a spheroid, hyperechoic lesion with internal heterogeneity and a calcified rim.
  • MRI showed a lesion with characteristics of fat on T1 and T2 weighted images, featuring peripheral and internal calcifications.

Findings:

  • Histological examination confirmed the excised mass to be an osteolipoma.
  • The lesion was composed of mature adipose tissue and osseous metaplasia.
  • Imaging findings were consistent with the histopathological diagnosis.

Implications:

  • This case underscores the importance of considering osteolipoma in the differential diagnosis of wrist masses, especially those with imaging features of fat and ossification.
  • Accurate diagnosis of osteolipoma can prevent unnecessary aggressive treatment for a benign condition.
  • Further research into the pathogenesis and optimal management of osteolipomas may be warranted.