343 results found
Article
Fibrous cortical defect (historical)
Fibrous cortical defects (FCD) is a previously used term to describe non-ossifying fibromas smaller than 2-3 cm. Non-ossifying fibroma is now the recommended term per the WHO classification of soft tissue and bone tumors (5th edition) 6.
In the popular mnemonic for lucent bone lesions FEGNOMASH...
Article
WHO classification of odontogenic and maxillofacial bone tumors
The WHO classification of odontogenic and maxillofacial bone tumors, last published in 2017, is a subset of the WHO classification of head and neck tumors (4th edition), which lays out a histological classification system for neoplasms and other tumors related to the odontogenic apparatus.
Clas...
Article
WHO classification of head and neck tumors
The World Health Organizatiοn (WHO) classification of head and neck tumors is the most widely used pathologic classification system for such disorders. The current revision, part of the 4th edition of the WHO series, was published in 2017 and is reflected in the article below 1.
Classification
...
Article
Fibroxanthoma of bone
Fibroxanthoma of bone and metaphyseal fibrous defect are terms that have been previously used to encompass both non-ossifying fibroma and fibrous cortical defect or synonymous with non-ossifying fibroma 1-4. Non-ossifying fibroma and fibrous cortical defect are histologically the same and the di...
Article
Acral fibromyxoma
Acral fibromyxomas, also known as superficial acral fibromyxomas or digital fibromyxomas are benign mesenchymal proliferations prone to recurrence usually found in the subungual and periungual sites of the digits.
Terminology
The term 'cellular digital fibroma' is not recommended 1,2.
Epidemi...
Article
WHO classification of tumors of soft tissue
The World Health Organization (WHO) classification of soft tissue tumors is the most widely used pathology-based classification system for such disorders. The current revision, part of the 5th edition of the WHO classification of soft tissue and bone tumors (volume 3), was published in 2020 and ...
Article
Lucent/lytic bone lesion - differential diagnosis (mnemonic)
Mnemonics for the differential diagnosis of lucent/lytic bone lesions include:
FEGNOMASHIC
FOG MACHINES
They are anagrams of each other and therefore include the same components. They are by no means exhaustive lists, but are a good start for remembering a differential for a lucent/lytic bone...
Article
Bone tumors (overview)
There are a bewildering number of bone tumors with a wide variety of radiological appearances. For a formal and updated classification of bone tumors, see WHO classification of tumors of bone.
bone-forming tumors
osteoma
osteoid osteoma
osteoblastoma
osteosarcoma
cartilage-forming tumors
...
Article
Giant cell tumor of bone
Giant cell tumors (GCT) of bone are locally aggressive and rarely malignant or metastasizing bony neoplasms, typically found at the end of long bones which is the region around the closed growth plate extending into the epiphysis and to the joint surface 1. They are classified as osteoclastic gi...
Article
WHO classification of tumors of bone
The World Health Organization (WHO) classification of bone tumors is the most widely used pathologic classification system for such disorders. The current revision, part of the 5th edition of the WHO series, was published in 2020 and is reflected in the article below 1.
Classification
Chondrog...
Article
Ovarian fibrothecoma
Ovarian fibrothecomas comprise tumors in the spectrum of ovarian sex cord / stromal tumors where there are components of both an ovarian fibroma and an ovarian thecoma.
Epidemiology
Most occur in adult women, with ~66% in postmenopausal women. Although they account for ~1% of all ovarian tumo...
Article
Expansile lytic lesions without cortical destruction of bone (differential)
Expansile lytic bone lesions without cortical destruction can result from various benign and malignant neoplastic pathologies, causes include 1:
unicameral bone cyst
aneurysmal bone cyst (eccentric)
enchondroma
chondromyxoid fibroma (eccentric)
non-ossifying fibroma (eccentric)
desmoplasti...
Article
Ovarian thecoma
Ovarian thecomas are benign ovarian tumors of sex cord / stromal (mesenchymal) origin. They are thought to account for approximately 0.5-1% of all ovarian tumors. As ovarian thecomas secrete estrogen, they are described as functional ovarian tumors.
Epidemiology
They typically present in older...
Article
Low T1 bone lesion
Low T1 bone lesions or T1 hypointense bone lesions are radiological terms to categorize bone lesions according to their visually perceived low signal on T1 weighted images. Apart from the usual description of a bone lesion seen on MRI they are used to categorize incidentally found solitary bone ...
Article
Metaphyseal lesions
The differential diagnosis for metaphyseal lesions includes:
osteomyelitis
metastases
non-ossifying fibroma
enchondroma
aneurysmal bone cyst
simple bone cyst
chondromyxoid fibroma
chondrosarcoma
cortical desmoid
giant cell tumor
desmoplastic fibroma
intraosseous lipoma
osteosarcoma
...
Article
Mandibular lesions
Mandibular lesions are myriad and common. The presence of teeth results in lesions that are specific to the mandible (and maxilla) and a useful classification that defines them as odontogenic or non-odontogenic. While it may often not be possible to make a diagnosis on imaging alone, this classi...
Article
Musculoskeletal fibromatoses
Musculoskeletal fibromatoses represent a wide spectrum of fibroblastic and myofibroblastic neoplasms with similar pathologic appearances and variable clinical behavior.
Pathology
They are benign fibrous tissue proliferations characterized by infiltrative growth and a tendency for local recurr...
Article
Osseous Tumor Reporting and Data System (OT-RADS)
Osseous Tumor Reporting and Data System (OT-RADS) is a reporting and communication tool designed to reliably identify benign and malignant bone tumors and to communicate them in a standardized way, using BI-RADS as an example 1-3.
History and etymology
The Osseous Tumor Reporting and Data Syst...
Article
Osteochondromyxoma
Osteochondromyxomas (OMX) are very rare benign tumors with both a chondroid and osteoid matrix mostly seen within the Carney complex.
Epidemiology
Generally, osteochondromyxomas are extremely rare. Within the Carney complex, they occur in about 1% of the patients and are usually seen early in ...
Article
Pediatric knee radiograph (an approach)
Pediatric knee radiographs are commonly encountered in the emergency department and vary from adult knee radiographs. Younger knees have open growth plates, ossification center development and display unique injury patterns. Growth plates are areas of weakness, susceptible to fracture and injuri...
Unable to process the form. Check for errors and try again.