John Thomas sign

High school (ages 12+)
Human Body

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/john-thomas-sign

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the visual phenomenon?Refers to the shadow of the penis visible on a pelvic X-ray
2. Why is it called the John Thomas sign?The name comes from a humorous nickname, not a real person, and it is also sometimes called the Throckmorton sign.
3. Does the John Thomas sign help doctors find fractures?No. Studies show it is no better at locating a fracture than random guessing, so it isn’t used for diagnosis.

Radiology: The medical discipline utilizing imaging technologies for diagnosis and treatment, including X-rays.
Pelvis: The complex bony structure at the base of the spine, connecting to the femurs.
Unilateral: Pertaining to or affecting only one side of the body.
Radiograph: An image produced by X-rays passing through an object onto a photographic plate or digital sensor.