lump and bumps ultrasound evaluation · the vastus medialis muscle of 5cm maximum diameter. it...
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Lump and Bumps Ultrasound Evaluation
Lorelei Waring
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Why US?
• Excellent first test for accessible lesions
• Good access, short waits
• Dynamic assessment with patient present- allows history to be taken- imperative.
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Why scan?
3 categories-useful triage:
• benign lesion- no further action required.
• equivocal lesion-further referral/further imaging necessary
• suspicious lesion- urgent referral/further imaging necessary
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US Characterisation
• Skin
• Subcutaneous Fat
• Neurovascular structures
• Muscle
• Tendon
• Bone
• Lymph nodes
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US Characterisation • Location - e.g ganglia, plantar fibromatosis,
muscle hernia.
• Size
• Margins
• Invasion
• Echopattern
• Vascularity
• Mobility
• Calcification
• Compressibility
• History
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Benign lesion - no further action • Normal anatomy- lipomatosis-contralateral side
• Lipoma
• Ganglion-beware synovial sarcoma.
• Sebaceous cyst
• Reducible abdominal wall hernia
• Foreign body
• Haematoma
• Fat necrosis
• Baker’s cyst
• Varicoscity
• Muscle hypertrophy-contralateral side
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Lipoma
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Ganglion
• Cystic, not vascularised, often lobulated, neck to tendon or joint
• Sometimes post traumatic
• Contain jelly like fluid
• Aspirate/surgery
• Beware synovial sarcoma-history
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Sebaceous cysts
• Sebaceous cyst misnomer - not of sebaceous origin.
• Epidermoid cyst sac forms from proliferation of epidermal cells within the dermis
• Pilar cyst sac forms from cells from the infundibulum of the hair follicles
• Punctum can tether cyst to overlying epidermis-secures diagnosis.
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Reducible abdominal wall hernia
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Foreign body
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Fat necrosis
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Baker’s cyst Semi-membranosus gastrocnemius bursa
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Varicosity
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Muscle Hypertrophy
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Recalcitrant haematoma
Beware haematoma vs. malignancy
with absence of trauma ‘warning’
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Equivocal lesions - further referral/imaging necessary
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Small mass - unknown aetiology
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Small mass - unknown aetiology
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Small mass - unknown aetiology
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Small mass - unknown aetiology
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Myositis ossificans
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Small mass - unknown aetiology
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Calcified
• Exostosis/ osteochondroma or consider chondrosarcoma
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Intramuscular lipoma
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Benign lesions - MSK origin
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Bursitis
• Bursas all over the body, commonly near joints to assist movement of tendons over bone and reduce friction.
• Bursitis can be caused by chronic overuse, trauma, rheumatoid arthritis (congenital bursae synovial lined), gout or infection. Sometimes the cause cannot be determined.
• Mass like -can feel soft or firm
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Adventitious Bursitis • Adventitious bursa- result
of excessive friction between soft-tissue and underlying bony protuberances –e.g. submetatarsal
• Frequently subcutaneous
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Bursitis-pre patellar
•Similar
appearances
at olecranon.
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Bursitis? Underlying inflammatory arthropathy
Gout
RA
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Plantar fibromatosis
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Dupytrens
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Tenosynovitis
Usual triad of:
• Fluid in tendon sheath,
• Hypoechoic swollen tendon
• Vascularity in tendon substance
• Can produce odd lumps in odd places – ECU-can be early presentation of RA
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De Quervain’s tenosynovitis
• Tendinopathy of the first extensor compartment
• Palpable painful swelling radial side of wrist
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Tuberculous Tenosynovitis
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Arthritis - presenting as lump
Midtarsal joint
Navicular/intermediate cuneiform
Normal side for comparison
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Intersection syndrome
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Achilles Tendinopathy
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Peripheral nerve sheath tumours
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Malignant PNST
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Malignant PNST – wide excision
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Suspicious lesion - further referral/imaging necessary
• infiltrative margins
• branching internal vascularity
• breeching fascial planes
• noticeable change in size
• internal calcifications-(xray first)
• exceeds 5cm max diameter-history dependant
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Suspicious lesion - further referral/imaging necessary
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Suspicious lesion - further referral/imaging necessary
• Sebaceous cyst!
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Suspicious lesion - further referral/imaging necessary
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Suspicious lesion - further referral/imaging necessary
• Liposarcoma.
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Suspicious lesion - further referral/imaging necessary
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Suspicious lesion - further referral/imaging necessary
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Suspicious lesion - further referral/imaging necessary
• Soft tissue MDT referral- excision and widespread reconstruction- angiosarcoma – subsequently gone on to develop liver mets.
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Suspicious lesion - further referral/imaging necessary
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Suspicious lesion - further referral/imaging necessary
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Suspicious lesion - further referral/imaging necessary
• High grade Spindle Cell Sarcoma- amputation
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Suspicious lesion - further referral/imaging necessary
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Suspicious lesion - further referral/imaging necessary
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Suspicious lesion - further referral/imaging necessary
• Extraosseous ewings sarcoma- amputation- 3 month history
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Is your US examination alone sufficient to obtain a diagnosis?
• Site – Is it clear?
• Extent – Can you see all of the lesion?
• Definitive diagnosis – Do you know what it is?
If NOT you need to recommend either further imaging or a specialist referral (second opinion from a specialist colleague)
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Report:
• Brief history and examination
• Outline findings
• Summary statement should include:
a) a diagnosis if possible
b) a recommendation for next move,if applicable.
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‘The patient describes a soft, non tender, mobile lump on the anterior aspect
of her forearm that has been present for 2 years- in that time it has not grown
in size.
The lump corresponds to a well circumscribed mass within the
subcutaneous fat of 2cm maximum diameter. No internal vascularity.
Conclusion-Appearances are in keeping with a subcutaneous lipoma. No
sinister features.
Should this mass increase in size or become painful, a rescan is advised.’
‘
Report: No action-unequivocal
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Report:Sinister findings- urgent action
The patient describes a 3 month history of a painless swelling to the left distal medial thigh-on examination this is firm and fixed. The swelling corresponds to a non mobile mass within the vastus medialis muscle of 5cm maximum diameter. It demonstrates an irregular outline, a heterogenous echotexture and marked internal vascularisation.
Conclusion -This mass is highly suspicious of a soft tissue sarcoma.
Urgent referral to the plastic surgeons via the soft tissue MDT is necessary- report faxed to GP.’
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Report:Equivocal findings- further referral
• The patient describes a lump of 3 months duration on the radial border of the distal phalanx of his right index finger. He became aware of this lump following a direct puncture wound from a thorn. It has remained the same size since he has been aware it. It was initially painful- following 2 courses of antibiotics the pain has subsided but the lump persists.
• The lump corresponds to a diffuse mass with ill defined borders of 1.5 cm- it does demonstrate some internal vascularity. A foreign body within this mass is difficult to exclude owing to the complex nature of this mass.
• Conclusion It is difficult to determine the exact nature of this mass on ultrasound-given the three month duration of this mass and its failure to respond to antibiotics coupled with the fact the patient describes a general malaise, then plastic surgical referral is necessary for further management.
• I