PAGET DISEASE
Paget disease (osteitis deformans) is a
localized disorder of bone remodeling, result-ing in excessive bone resorption
followed by disorganized bone replacement, pro-ducing thickened but weak bone
that is susceptible to deformity and fracture. There is an association with
paramyxovirus and mutations of SQSTM1.
•
Seen in those age >40
•
Common in those of European ancestry
•
Common sites of involvement include the skull, pelvis, femur, and
vertebrae
•
Majority of cases are polyostotic and mild
Paget disease develops in 3
stages:
•
Osteolytic stage (osteoclastic activity
predominates)
•
Mixed osteolytic-osteoblastic
stage
•
Osteosclerotic stage (osteoblastic activity
predominates in this “burnout stage”)
Paget disease can cause bone
pain and deformity, fractures, and warmth of the over-lying skin due to bone
hypervascularity. X-rays show bone enlargement with lytic and sclerotic areas.
Lab studies show highly elevated serum alkaline phosphatase and increased
levels of urinary hydroxyproline. Complications include arteriove-nous shunts
within marrow, which may result in high-output cardiac failure and an increased
incidence of osteosarcoma and other sarcomas.
Microscopically, there is a
haphazard arrangement of cement lines, creating a “mosaic pattern” of lamellar
bone. Involved bones are thick but weak and fracture easily. Skull involvement
leads to increased head size and foraminal narrowing that can impinge on
cranial nerves, often leading to deafness. Involvement of facial bones may
produce a lion-like facies.
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