Items tagged “musculoskeletal”

76 results found

Positive metacarpal sign

In the metacarpal sign, a line drawn along the heads of the 4th and 5th metacarpals will intersect the head of the 3rd metacarpal if shortening is present. The shortened 4th metacarpal is the key to the sign. The sign is positive in up to 9.6% of normal individuals 3. It is however seen in a va...


Osteochondromas are a relatively common imaging finding, accounting for 10-15% of all bone tumors and approximately 35% of all benign bone tumors. Although usually thought of as a benign bone tumor, they may be thought of as a developmental anomaly. They are frequently asymptomatic and have very...

Paget disease (bone)

Paget disease of the bone is a common, chronic bone disorder characterized by excessive abnormal bone remodeling. The classically described radiological appearances are expanded bone with a coarsened trabecular pattern. The pelvis, spine, skull, and proximal long bones are most frequently affect...

Parosteal osteosarcoma

Parosteal osteosarcoma is a subtype of osteosarcoma and arises from the outer layer of the periosteum.  Epidemiology It is the most common type of juxtacortical or surface osteosarcoma and accounts for ~5% of all osteosarcomas. It typically presents in early adulthood and middle age with a pea...

Sacroiliac joint injection

Sacroiliac joint injections can be performed using a posterior approach into the sacroiliac (SI) joint under fluoroscopic or CT guidance. It is often performed bilaterally. Indications diagnostic: relief of pain after injection of local anesthetic therapeutic: to relieve pain from degenerativ...

Tumoral calcinosis

Tumoral calcinosis is a rare familial condition characterized by painless, periarticular masses. The term should be strictly used to refer to a disease caused by a hereditary metabolic dysfunction of phosphate regulation associated with massive periarticular calcinosis and should not be used to ...

Kirner deformity

A Kirner deformity, also known as dystelephalangy, is characterized by a curvature of the distal phalanx of the 5th digit in both a palmar and radial direction. Epidemiology The deformity typically presents in late childhood to early adolescence, although a mild deformity may be present at bir...

Acetabular angle

The acetabular angle is a radiographic measurement used when evaluating potential developmental dysplasia of the hip (DDH).  It is most useful in patients who have started to ossify the epiphysis since ossification diminishes the usefulness of ultrasound. The angle is formed by a horizontal lin...

Morel-Lavallée lesion

Morel-Lavallée lesions are closed degloving injuries associated with severe trauma which then present as hemolymphatic masses. MRI and ultrasound are useful modalities for evaluation. Terminology The lesions classically occur over the greater trochanter of the femur 1. Morel-Lavallée lesions, ...


Lipomas are benign tumors composed of mature adipocytes. They are the most common soft tissue tumor, seen in ~2% of the population.  Epidemiology Patients typically present in adulthood (5th-7th decades). Associations In some cases, multiple lipomas are associated with syndromes and other di...

Köhler disease

Köhler disease is an eponymous term referring to childhood-onset osteonecrosis of the navicular bone in the foot. Mueller Weiss syndrome is the adult counterpart of navicular bone osteonecrosis 4,5. Epidemiology It typically presents in the pediatric population (4-6 years of age) and there is ...

Cleidocranial dysostosis

Cleidocranial dysostosis (CCD), also known as cleidocranial dysplasia, is a rare skeletal dysplasia with predominantly membranous bone involvement, which carries an autosomal dominant inheritance 4. Clinical presentation large head, with large fontanelles with delayed closure broad mandible ...


Osteoblastomas are rare bone-forming tumors that may be locally aggressive. They are larger (>1.5-2 cm) and tend to affect the axial skeleton more often than their histologic relative, osteoid osteoma. Epidemiology They account for 1-3% of all primary bone tumors 2,3. Patients typically presen...

Ganglion cyst

Ganglion cysts are non-malignant cystic masses that occur in association with musculoskeletal structures. They are the most common soft tissue mass in the hand and wrist.  Terminology Ganglion cysts are sometimes also simply referred to as ganglia or a ganglion, but should not be confused with...

Aggressive fibromatosis

 Diagnosis almost certain
Dr Matt Skalski
Published 06 Jan 2015
80% complete
Annotated imageMRIX-ray

Craniofacial fibrous dysplasia

 Diagnosis probable
Dr Skúli Óskar Kim
Published 11 Nov 2014
74% complete

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