1
Q
What is the best imaging modality for assessing cortex, bone density, and alignment?
A
X-ray is the best modality for assessing cortex, bone density, and alignment.
2
Q
What are the advantages of using X-ray for imaging?
A
X-rays are a first-line imaging option, are inexpensive, and provide fast results.
3
Q
Which imaging modality is best for evaluating cortical detail, marrow pattern, and 3D reconstruction?
A
CT scans are best for evaluating cortical detail, marrow pattern, and 3D reconstruction.
4
Q
What is a key advantage of CT scans in imaging?
A
CT scans offer high resolution.
5
Q
What type of tissues is MRI best suited for imaging?
A
MRI is best for imaging soft tissues, cartilage, ligaments, and bone marrow.
6
Q
What is the primary advantage of MRI in imaging?
A
MRI provides the best soft tissue contrast.
7
Q
For what conditions is MRI particularly useful?
A
MRI is particularly useful for tumor assessment and ligament injuries.
8
Q
What does a bone scan primarily assess?
A
A bone scan assesses osteoblastic activity.
9
Q
What kind of information can be obtained from a bone scan?
A
Bone scans provide metabolic information.
10
Q
What is a common screening use for bone scans?
A
Bone scans are used for screening metastatic disease.
11
Q
Which imaging modality is considered high-yield for bone tumors, cartilage, and ligaments?
A
MRI is considered high-yield for bone tumors, cartilage, and ligaments due to its superior soft tissue visualization.
12
Q
What are the anatomical zones in long bones?
A
The anatomical zones in long bones are the epiphysis, metaphysis, and diaphysis.
13
Q
Where is the epiphysis located in a long bone?
A
The epiphysis is located at the end of the bone.
14
Q
Where is the metaphysis located in a long bone?
A
The metaphysis is the flared region between the epiphysis and the diaphysis.
15
Q
Where is the diaphysis located in a long bone?
A
The diaphysis is the shaft or middle section of the bone.
16
Q
What type of tumors are found in the epiphysis?
A
Chondroblastoma is an example of an epiphyseal tumor.
17
Q
What is a characteristic feature of chondroblastoma regarding age?
A
Chondroblastoma is a pediatric bone tumor, typically found in children.
18
Q
What is the characteristic location of chondroblastoma within a long bone?
A
Chondroblastoma is characteristically located in the epiphysis, in or near the epiphyseal plate.
19
Q
What is the preferred imaging modality for characterizing chondroblastoma?
A
MRI is the preferred imaging modality for characterizing chondroblastoma.
20
Q
What is the typical appearance of a chondroblastoma on imaging?
A
Chondroblastoma typically appears as a lytic lesion, which may calcify.
21
Q
What matrix is associated with chondroblastoma?
A
Chondroblastoma is associated with a chondroid matrix.
22
Q
What is another name for Osteoclastoma?
A
Giant Cell Tumor (GCT)
23
Q
What is the typical age group for Osteoclastoma (GCT)?
A
Adults aged 30-40 years.
24
Q
Where is Osteoclastoma (GCT) typically located?
A
Epiphysis, often extending to the metaphysis.
25
What characteristic appearance is associated with Osteoclastoma (GCT) on imaging?
Soap bubble appearance.
26
What is the malignancy risk associated with Osteoclastoma (GCT)?
Low malignancy risk (1-2%), but it can be aggressive.
27
Which imaging modality is useful for assessing soft tissue involvement in Osteoclastoma (GCT)?
MRI.
28
What is the mnemonic for Osteoclastoma (GCT)?
GCT = Adults 30-40 + Epiphysis + Soap Bubble + Low but possible malignancy.
29
What part of the bone are diaphyseal tumors located in?
The shaft of the bone.
30
What is a classic clinical presentation of Osteoid Osteoma?
Nocturnal pain that is relieved by NSAIDs.
31
What is the typical size of an Osteoid Osteoma?
Less than 1.5 cm.
32
What is the term for the central lucent area within an Osteoid Osteoma?
Nidus.
33
What is observed around the nidus of an Osteoid Osteoma?
Surrounding sclerosis (dense bone).
34
What is the common age group for Osteoid Osteoma?
Young adults, typically between 10-30 years old.
35
What is a common and curative treatment for Osteoid Osteoma?
Radiofrequency Ablation (RFA).
36
What is the typical age range for Ewing's Sarcoma?
Children between 5 and 25 years old.
37
Where is Ewing's Sarcoma typically located?
The diaphysis (shaft) of long bones.
38
What is the definitive genetic marker for Ewing's Sarcoma?
The t(11;22) chromosomal translocation.
39
What immunohistochemistry marker is typically positive in Ewing's Sarcoma?
CD99 antigen (CD99+).
40
What is a significant characteristic of Ewing's Sarcoma regarding radiation therapy?
It is the most radiosensitive bone tumor.
41
What is a significant characteristic of Ewing's Sarcoma regarding chemotherapy?
It is the most chemosensitive bone tumor, making neoadjuvant chemotherapy effective.
42
What is the typical management for Ewing's Sarcoma?
Combined multimodal treatment including chemotherapy, radiation, and possibly surgery.
43
What is the general prognosis for Ewing's Sarcoma without treatment?
Poor, with a 60-70% mortality rate, indicating it is an aggressive malignancy.
44
What is a mnemonic for remembering key features of Ewing's Sarcoma?
Ewing's = Child (5-25) + Diaphysis + t(11;22) + CD99+ + Most radiosensitive + Most chemosensitive.
45
What is the most common location for Adamantinoma?
The anterior tibia.
46
What is a characteristic appearance associated with Adamantinoma, particularly in the tibia?
"Bowing of the tibia".
47
What is the general classification of Adamantinoma in terms of malignancy?
It is a low-grade malignancy, characterized by slow growth.
48
What is the typical age group for osteosarcoma?
Adolescents, with a peak incidence between 10 and 25 years old.
49
Where is osteosarcoma most commonly located?
The metaphysis, particularly around the knee (distal femur or proximal tibia), accounting for about 50% of cases.
50
What are the characteristic radiographic findings of osteosarcoma?
A 'sunburst' appearance due to radiating spicules and 'Codman's triangle' representing periosteal reaction.
51
How does osteosarcoma respond to radiation therapy?
It is considered the most radioresistant bone tumor, showing a poor response to radiation.
52
What is the significance of osteosarcoma in terms of bone tumor frequency?
It is the most common primary malignant bone tumor.
53
What is the general prognosis for osteosarcoma, even with treatment?
High mortality, with approximately 50% mortality even with treatment.
54
What are the primary treatment modalities for osteosarcoma?
Surgery (limb-sparing or amputation) combined with chemotherapy.
55
What is the characteristic appearance of a Simple (Unicameral) Bone Cyst on imaging?
The characteristic appearance is the 'Fallen leaf' or 'Trap door' sign, which is indicative of a pathologic fracture.
56
Where are Simple (Unicameral) Bone Cysts typically located?
They are usually found in the metaphysis, most commonly of the proximal humerus or femur.
57
What age group is typically affected by Simple (Unicameral) Bone Cysts?
Simple (Unicameral) Bone Cysts are pediatric lesions, meaning they are found in children.
58
Are Simple (Unicameral) Bone Cysts considered malignant?
No, they are benign, but they can be associated with pathologic fractures, so complications should be watched for.
59
What is the hallmark imaging finding for an Aneurysmal Bone Cyst (ABC)?
The hallmark imaging finding is the 'Soap Bubble' appearance, due to multiple cystic spaces.
60
Where are Aneurysmal Bone Cysts (ABCs) typically located?
ABCs are typically found in the metaphysis.
61
What age group is commonly affected by Aneurysmal Bone Cysts (ABCs)?
ABCs are commonly found in adolescents, making it a young patient group.
62
How would you describe the behavior of an Aneurysmal Bone Cyst (ABC)?
ABCs are benign but expansile, meaning they can grow and appear aggressive-looking.
63
What is an exostosis also known as?
Osteochondroma
64
What is the typical appearance of an exostosis?
A bony outgrowth with a cartilage cap.
65
Is an exostosis generally considered benign or malignant?
Benign, but it has the potential to transform.
66
What is monitored to assess the risk of an exostosis?
The thickness of the cartilage cap.
67
What imaging technique is used to track cartilage cap thickness?
MRI
68
When is surgical resection of an exostosis indicated?
When the cap size is greater than 1.5 cm.
69
What is the risk associated with a thick cartilage cap on an exostosis?
Increased risk of malignancy.
70
What type of cancer can an exostosis transform into?
Chondrosarcoma
71
What is the approximate percentage risk of an exostosis transforming into a chondrosarcoma?
1-5%
72
What is the mnemonic for exostosis management?
Exostosis + cap >1.5cm = Surgery needed; Monitor for chondrosarcoma
73
What is an enchondroma?
A benign tumor of cartilage.
74
What syndrome is associated with multiple enchondromas?
Ollier's Syndrome
75
What are the key features of Ollier's Syndrome?
Multiple cartilaginous lesions and hemangiomas.
76
What syndrome is characterized by enchondromas and vascular malformations?
Maffucci Syndrome
77
What is the malignancy risk of a single enchondroma?
Low.
78
What is the malignancy risk of multiple enchondromas?
Higher transformation risk compared to single enchondromas.
79
What is the characteristic radiographic appearance of fibrous dysplasia?
Fibrous dysplasia typically presents with a "ground glass" appearance, which is a homogeneous radiopacity.
80
What is the "Shepherd crook" deformity in the context of fibrous dysplasia?
The "Shepherd crook" deformity refers to the bowing of the femur, specifically a varus deformity, which is a common manifestation of fibrous dysplasia in the femur.
81
What associated conditions can be seen with polyostotic fibrous dysplasia?
Polyostotic fibrous dysplasia can be associated with McCune-Albright Syndrome, which is characterized by café-au-lait spots and endocrine dysfunction.
82
What is the risk of malignancy associated with fibrous dysplasia?
The risk of malignancy with fibrous dysplasia is very low, less than 1%, although rare sarcomatous transformation is possible.
83
What is a helpful mnemonic for remembering the key features of fibrous dysplasia?
A useful mnemonic is: "Fibrous Dysplasia = Ground glass + Shepherd crook + McCune-Albright (polyostotic)".
84
What are the typical locations for chondrosarcoma?
Chondrosarcoma typically occurs in flat bones, such as the pelvis, scapula, and ribs.
85
What is the characteristic appearance of chondrosarcoma on imaging?
Chondrosarcoma often shows "stippled ring" calcifications, which are indicative of a chondroid matrix pattern.
86
What is the typical grade and prognosis of chondrosarcoma?
Chondrosarcoma is usually low to intermediate grade, with a variable prognosis.
87
How does chondrosarcoma respond to radiotherapy compared to osteosarcoma?
Radiotherapy is effective for chondrosarcoma, as it is radiosensitive, unlike osteosarcoma.
88
What is Ochronosis also known as?
Alkaptonuria
89
What is the underlying cause of Ochronosis?
Accumulation of homogentisic acid
90
What is the inheritance pattern of Ochronosis?
Autosomal recessive
91
What is a characteristic clinical sign of Ochronosis?
Black discoloration of the pinna (ear)
92
What is observed in the cartilage in Ochronosis?
Dark pigment
93
What is a radiological hallmark of Ochronosis?
Intervertebral disc calcification (IVD calcification)
94
When does Ochronosis typically become obvious?
In the 3rd-4th decade of life
95
What is the nature of Ochronosis as a disease?
Progressive degenerative disease
96
What is another name for Diffuse Idiopathic Skeletal Hyperostosis (DISH)?
Forrestiere's disease
97
Who is Forrestiere's disease named after?
Researcher Forrestiere
98
What is the pattern of new bone formation in DISH?
Along the anterior longitudinal ligament
99
What is the characteristic appearance of new bone formation in DISH?
Flowing ossification
100
What is the typical age of presentation for DISH?
55+ years
101
What is the descriptive term for the appearance of bone formation in DISH?
"Candle dripping" appearance
102
What is a key feature of the disc space in DISH?
Preserved disc space height
103
What does preserved disc space height in DISH help differentiate from?
Fusion
104
What are the key components of the mnemonic for DISH/Forrestiere's disease?
55+ years, New bone on ALL, "Candle dripping", Preserved disc
105
What is rickets primarily caused by?
Rickets is primarily caused by Vitamin D deficiency.
106
What age group is typically affected by rickets?
Rickets commonly affects children, particularly around the age of 5 years.
107
What are the classic signs of rickets at the growth plate?
The classic signs at the growth plate are 'cupping' and 'splaying'.
108
What metaphyseal changes are seen in rickets?
Metaphyseal changes include cupping, splaying, and fraying.
109
What is the Zone of Provisional Calcification (ZPC) in the context of rickets?
In rickets, there is a loss of the sharp ZPC line due to defective mineralization.
110
What is Wimberger's Ring?
Wimberger's Ring is a dense ring around the epiphysis, indicating preserved bone at the articular margin.
111
Describe the pathophysiological cascade in rickets.
Decreased Vitamin D leads to decreased calcium and phosphate, which in turn increases Parathyroid Hormone (PTH).
112
What is a mnemonic for remembering the key features of rickets?
A mnemonic for rickets is 'CSF' (Cupping, Splaying, Fraying) plus decreased Vitamin D and decreased Calcium.
113
What is the 'White line of Frænkel' a sign of?
The 'White line of Frænkel' is a dense metaphyseal band seen during the remineralization phase, indicating healing rickets.
114
What does the 'White line of Haass' indicate?
The 'White line of Haass' indicates periosteal bone formation and is a healing indicator for rickets.
115
What is the role of Vitamin D in bone health?
Vitamin D is crucial for the proper mineralization of bone by facilitating the absorption of calcium and phosphate.
116
How does low socioeconomic status relate to rickets?
Low socioeconomic status can be associated with rickets due to factors like poor nutrition and limited access to sunlight.
117
What is meant by 'splaying' of the growth plate in rickets?
'Splaying' refers to the widening and flaring of the metaphysis at the growth plate.
118
What is meant by 'cupping' of the growth plate in rickets?
'Cupping' refers to the concave, cup-like appearance of the metaphysis at the growth plate.
119
What is meant by 'fraying' of the growth plate in rickets?
'Fraying' refers to the irregular, brush-like appearance of the metaphysis at the growth plate due to defective mineralization.
120
What is the significance of increased PTH in rickets?
Increased PTH is a compensatory mechanism in rickets, attempting to raise serum calcium levels by mobilizing calcium from bone and increasing renal reabsorption of calcium, but it also leads to increased phosphate excretion.
121
What is the 'remineralization phase' in the context of rickets?
The remineralization phase is when the bone begins to heal and regain its mineral content, often indicated by the 'White line of Frænkel'.
122
What is the meaning of 'defective mineralization' in rickets?
Defective mineralization means that the bone is not properly accumulating calcium and phosphate, leading to soft and weak bones.
123
What is the most common skeletal dysplasia?
Achondroplasia is the most common skeletal dysplasia.
124
What is the characteristic limb shortening pattern in achondroplasia?
Rhizomelic shortening, which is proximal limb shortening, is characteristic of achondroplasia.
125
What skeletal changes are seen in achondroplasia?
Achondroplasia involves metaphysis and cone-shaped epiphyses.
126
How does short stature in achondroplasia differ from osteoporosis?
In achondroplasia, there is short stature with normal bone density, which differentiates it from osteoporosis.
127
What is the mnemonic for Chondroblastoma?
Chondroblastoma = Child + Epiphysis, indicating a pediatric epiphyseal tumor.
128
What does the mnemonic 'GCT = 30-40 + Soap Bubble' refer to?
This mnemonic refers to Giant Cell Tumor, which typically occurs in adults and has a 'soap bubble' appearance on imaging.
129
What is the mnemonic for Osteoid?
Osteoid = Pain + NSAID + Nidus. Nocturnal pain relief is a pathognomonic clinical pearl.
130
What are the key features of Ewing's sarcoma according to the mnemonic?
Ewing's = Child + t(11;22) + CD99+ + Radiosensitive. It is the most chemosensitive and radiosensitive bone tumor.
131
What is the characteristic location associated with Adamantinoma?
Adamantinoma is associated with bowing of the tibia.
132
What does the mnemonic 'Osteosarcoma = Adolescent + Sunburst + Codman's' describe?
This mnemonic describes Osteosarcoma, the most common malignant bone tumor, often seen in adolescents with a 'sunburst' appearance and Codman's triangles.
133
What is the management threshold for an exostosis cap greater than 1.5cm?
An exostosis cap >1.5cm suggests a risk of chondrosarcoma transformation and may warrant surgery.
134
What is the pathognomonic sign for Fibrous Dysplasia?
Fibrous Dysplasia is associated with the 'Shepherd's Crook' deformity, a type of femoral varus.
135
What does an 'Ivory vertebra' sign indicate?
An Ivory vertebra, which is a sclerotic vertebra, is a sign of malignancy, often lymphoma or Hodgkin's disease.
136
What is the characteristic appearance of a vertebra in osteoporosis?
Osteoporosis is associated with 'Codfish' vertebrae, which are biconcave.
137
What condition is indicated by a 'Dagger' sign in spinal imaging?
The 'Dagger' sign refers to syndesmophytes and is associated with Ankylosing Spondylitis (AS).
138
What does a 'Bamboo' spine signify?
A 'Bamboo' spine indicates advanced Ankylosing Spondylitis (AS) with complete spinal fusion.
139
What are the clinical and genetic associations of Ankylosing Spondylitis (AS)?
AS is associated with young males, HLA-B27, sacroiliitis, uveitis, and heel pain.
140
What are the signs of Ochronosis?
Ochronosis is characterized by a black pinna and intervertebral disc calcification, and is a sign of Alkaptonuria.
141
What does the mnemonic 'DISH = 55yr + Forrestiere's' refer to?
This mnemonic refers to Diffuse Idiopathic Skeletal Hyperostosis (DISH), typically seen in elderly patients (around 55 years old) and characterized by 'candle dripping' ossification.
142
What are the characteristic findings of Rickets?
Rickets, a metabolic bone disease associated with low Vitamin D, presents with cupping, splaying, and fraying of the metaphyses.
143
What is the 'Chevron's sign' associated with?
The 'Chevron's sign', characterized by metaphyseal spurs, is associated with Scurvy, a Vitamin C deficiency.
144
What is the diagnostic cutoff for osteoporosis based on DEXA scan?
A T-score of less than -2.5 standard deviations on a DEXA scan is the diagnostic cutoff for osteoporosis.
145
What is the key skeletal dysplasia finding in achondroplasia?
Achondroplasia is characterized by rhizomelic (proximal) limb shortening.
Radio diagnosis
flashcards
Decks in class (21)
# Cards
-
basics and usg abdo184
-
usg abdo 2123
-
usg abdo 3156
-
machines161
-
MRI150
-
mri and c270
-
usg145
-
contrast media78
-
GI131
-
Intestine156
-
gallbladder117
-
gallbladder 232
-
Kidneysss158
-
Uretheral trauma ovaries and pregnancy130
-
thoracic radio210
-
thoracic park 2108
-
neuroradio139
-
neuroradio 296
-
MSK145
-
nuclear radio155
-
nuclear radio 2119
