Osteoid Osteoma

Instructions

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Here are the headings for your disorder:

Definition/Description

Benign osteoblastic tumor consisting of vascular osteoid tissue centrally and sclerotic bone peripherally. (Goodman & Snyder)

Prevalence

1/8 to 1/10 of symptomatic bone tumors and 5% of all primary bone tumors. (Lenke)

Usually found in males (3:1) in the 5-25 year old range.

Characteristics/Clinical Presentation

This type of tumor is commonly found in the diaphysis of long bones (proximal femur), hands and feed and posterior elements of the spine (lamina and spinouse processes).

Clinical presentation is typically pain in the area of the tumor, worse at night, increased skin temperature, sweating and tenderness to palpation of the localized area. Pain is relieved by salicylates or aspirin. 

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Ninety percent of cases occur in patients younger than 25 years so it can easily be miss-diagnosed as a musculoskeletal disorder because when someone in their twenties reports pain, the vast majority of people assume the pain is musculoskeletal in nature(1). The true diagnosis is so easily over looked because epiphyseal lesions mimic intra-articular derangement and pain is typically localized to the site of the lesion, so the location of pain can be anywhere, and may coincide with common sites of musculoskeletal inflammation or strain (2). Another reason diagnosis is easily misled is that pain usually occurs before the lesions are visible on radiographs and in the early stages can be easily missed on a radiograph (3). Finally, these lesions may be associated with proliferative synovitis due to prostaglandin secretion that decreases range of motion, creates joint effusion, and can mimic inflammatory arthritis (4).