Judgments

Reason for The Sunburst appearance seen in Osteosarcoma

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Usmle

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Sunburst appearance in Osteosarcoma -What is Osteosarcoma -Which layer of the bone is involved? -What are Sharpey's fibres? -What is the reason for the appearance? -Real Radiological Images

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Uploaded on July 1, 2021
Number of pages 7
Written in 2020/2021
Type Judgments
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osteosarcoma
sarcoma
osteo
bone
cancer
malignancy
tumor
periosteum
periosteal
reaction
physiology
pathology
anatomy
disease
human body
medical school
usmle
plab
decoded medicine

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Sunburst Appearance in Osteosarcoma
May 27, 2020
dr.priya07_DecodedMedicine
The rays of the sun are seen spreading around its bright center,
an appearance described as a sunburst

A similar appearance can be described in bone radiographs of
individuals with
Periosteal Osteosarcoma, a type of bone cancer.

Periosteal Osteosarcoma is a subtype of Osteosarcoma, a malignant
tumor of the bones. It commonly occurs in the long bones of the
extremities near the metaphyseal growth plates. The most common sites are
the femur (max%), the tibia (mostly proximal tibia), and the humerus

, The tumor arises from the inner layer of the periosteum.
It elevates the periosteum and produces a periosteal
reaction.

Layers of the bone

Periosteal reaction means reactive bone formation i.e., the
periosteum produces new bone in response to certain stressful
stimuli such as breaks, tears, stretches, inflammation or irritants.
The pattern of periosteal reaction varies depending on the
stimulus. The visualisation of this pattern in radiographic images
aids the identification and differentiation of malignant and benign
tumors.

In Osteosarcoma, the tumor grows rapidly but steadily due to
which the periosteum does not have enough time to lay down
even a thin layer of bone. Instead, the tiny fibers that connect
the periosteum to the bone (Sharpey’s
fibers) become stretched out perpendicular to the
bone. When these fibers ossify, they produce a pattern visible
on radiographic images as “sunburst” or “hair-on-
end” periosteal reaction.

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