Quick revision ↓ Medical Dictionary
Deep Learning — Module 15
Connect the clinical question to modality choice, image appearances, limitations and the next decision.
Start with alignment and anatomy
Confirm side, views and coverage before reviewing alignment, cortical margins, trabecular pattern, joints and soft tissues. Describe a fracture by bone and location, pattern, displacement, angulation and joint involvement. The distal fragment is commonly described relative to the proximal fragment. A clinical neurovascular assessment remains necessary because a radiograph cannot establish whether the limb is adequately perfused or sensation is intact.
Views and occult injury
Appropriate projections reveal abnormalities hidden by overlap, but normal radiographs do not exclude every fracture. Persistent focal tenderness after injury may require immobilization and further imaging according to the clinical pathway. Scaphoid and hip injuries are examples where an occult fracture matters. CT provides detailed bone anatomy; MRI can identify marrow injury and selected occult fractures, as well as soft-tissue disease.
Joints and arthritis
Assess joint space, alignment, erosions, osteophytes, subchondral change and surrounding soft tissue. Degenerative and inflammatory patterns can overlap but differ in distribution and characteristic findings. A swollen acutely painful joint may be infected even when early radiographs are unremarkable. Imaging complements urgent clinical assessment and sampling where appropriate; the absence of a dramatic image does not make septic arthritis safe to dismiss.
Bone lesions and infection
Describe whether a lesion is lucent, sclerotic or mixed and assess margins, the zone of transition, cortical integrity and periosteal response. Aggressive features raise concern but are not a histological diagnosis. Infection, malignancy and other processes can overlap. Biopsy planning for a suspected tumor should involve the specialist team because an unplanned route may interfere with definitive treatment.
Soft tissues and children
Ultrasound can assess selected tendons and superficial structures dynamically, while MRI provides detail of many ligaments, muscles and marrow abnormalities. In children, growth plates and ossification centers can resemble fractures, and some injuries involve the physis. Interpret with age and mechanism, avoiding automatic comparison imaging when unnecessary. The final impression should explain uncertainty and the recommended next step when clinical concern persists.
High-Yield Revision
- Describe alignment and joint involvement as well as the fracture line.
- Normal initial radiographs can miss important fractures.
- Growth plates require age-appropriate interpretation.
Common Exam & Concept Pitfalls
- An X-ray cannot replace neurovascular examination.
- Aggressive imaging features do not establish histology.
Sources & Further Reading
Curriculum and reference review: 25 September 2026. These original notes teach foundational imaging concepts and clinical reasoning. Interpretation of real studies and procedures requires supervised training. International guidance supports the principles below; local pathways, resources and authorized supervision govern patient care. Faculty review is pending.
- Choosing examinations: ACR Appropriateness Criteria
- Modality foundations: NIH NIBIB resources on CT, MRI and ultrasound
- Safety: IAEA Radiation Protection of Patients · ACR/RSNA RadiologyInfo on contrast materials, MRI safety and ionizing radiation
- Chest and vascular questions: Chest radiography and its limitations · Pulmonary embolism imaging
- Abdominal and urinary questions: Body CT · ACR acute flank pain criteria summary
- Neurological questions: Stroke imaging · Brain MRI
- Pelvic and pediatric questions: ACR acute pelvic pain criteria summary · ACOG adnexal torsion and Doppler limitations · Intussusception imaging and treatment
- Breast assessment: ACR palpable breast mass criteria summary · Mammography
- Nuclear medicine: Understanding a PET-CT report · EANM/SNMMI FDG imaging in infection and inflammation
- Image-guided procedures: Catheter angiography · Lung biopsy
- Reporting: ACR/RSNA guide to radiology reports
