28-Fibrous, Fat,Smooth Ms Tumors Flashcards
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Common location of a keloid
Sternal region
Immediate causative factor of the development of a keloid
Trauma
What differentiates keloids from hypertrophic scars histologically?
Thick hyalinized collagen bundles centrally
How do you administer triamcinolone intralesional injection
30 gauge needle on tuberculin syringe
40mg/ml- initial
10-20mg/ml- as lesions soften
6-8 weeks interval
Other forms of treatment for keloid
5-FU- higher hyperpigmentation, pain and ulceration risk
Flash lamp pulsed dye laser Cryosurgery Intralesional etanercept CCB (Verapamil)- decrease IL-6 and VEGF Excision
Protein Known to be involved in keloid formation
TGF-B
Fibromatosis of palmar aponeurosis
Multiple firm nodules in palm
Men 30-50 years old
Dupuytren contracture
Most commonly involved part in Dupuytren contracture
4th finger
Associated conditions in dupuytren contracture
Alcoholic cirrhosis
DM
Muscular dystrophy
Chronic epilepsy
The fibrous nodules in Dupuytren contracture are composed of myofibroblasts that express _____
Androgen receptors
This hormone induces an increase in Dupuytren fibroblast proliferation
5a- Dihydrotestosterone
Management of Dupuytren contracture
Intralesional triamcinolone or collagenase- early disease
Surgical excision of palmar fascia
Slowly enlarging nodules on the soles that cause difficulty walking
Analog of Dupuytren contracture
Plantar fibromatosis
Surgical treatment for plantar fibromatosis (Ledderhose disease)
Wide excision of plantar fascia
Adjuvant radiotherapy to decrease recurrence
Fibrous infiltration of the intracavernous septum of the penis that leads to its curvature upon erection
Pain may be severe
Peyronie disease
Tumor of infancy
Poorly demarcated, slow growing soft tissue mass on an extremity
Lipofibromatosis
Associated defects with lipofibromatosis
Syndactyly
Cleft lip and palate
ASD
trigonocephaly
Heloderma (knuckle pads) develop in which part of the toes and fingers
Extensor aspect of proximal interphalangeal joints of toes and fingers
Pachydermodactyly can be misdiagnosed as
Juvenile idiopathic arthritis
Benign fibromatosis of fingers
Fullness of digits proximal to PIP joint
Pachydermodactyly
Large deep seated well circumscribed masses from muscular aponeurosis
Recur locally and can kill if they invade vital structures
Desmoid tumor
Most common site of desmoid tumor
Abdominal wall
Especially in pregnant women
Most dangerous desmoid tumors are located in
Root of neck and intraabdominal type
Local recurrence of desmoid tumor may be due to mutations in this gene
B-catenin
Treatment of desmoid tumor
Wide local excision
RT
hormonal- tamoxifen with sulindac
Most common fibrous tumor of infancy
Infantile myofibromatosis
Most common site of infantile myofibromatosis
Metaphyseal regions of long bones
Linear constriction around the affected digit that leads to the amputation of the distal part spontaneously
Black African men
Usually unilateral
Ainhum
Ainhum usually affects which digit
Fifth toe
Treatment of ainhum
Cutting constricting band
Amputation-advanced cases
Intralesional betamethasone
May be acquired, congenital or as part of a disease
Abnormal collagen bundles and altered amounts of elastin
Usually on trunk, in lumbosacral area
May be solitary or linear/zosteriform arrangement- slighlty elevated yellow to orange plaques
Connective tissue nevus
Benign tumor usually located in subscapular region
Firm, encapsulated and believed to be an unusual response to repeated trauma
Excision is curative
Elastofibroma dorsi
Dome shaped sessile skin colored white or reddish papules on or near the nose, may be solitary
Concentric fibrosis surrounding vessels and adnexal structures
Superficial shave biopsy may be mistaken for melanoma
Fibrous papule of the nose
Fibrous papule of the nose may be mistaken for:
Nevocytic nevus
Neurofibroma
Granuloma pyogenicum
BCC
Pearly white dome shaped angiofibromas occurring circumferentially on the coronal margin and sulcus of glans penis
Pearly penile papule
Pearly penile papules should be distinguised from
Papilloma
Hypertrophic sebaceous glands
Condyloma acuminata
Pinkish, hyperkeratotic, hornlike projection on finger, toe, palm or sole
Emerges from collarette of eleveted skin
Resembles a supernumerary digit, cutaneous horn or neuroma
Acral fibrokeratoma
Acral fibrokeratoma is usually acquired from
Immunosuppressive therapy