Lessons in radiology:
Registrar 1: Hey Leng, come here. Have a look at this.
Lhui: ???
Reg 1: *Shows a pelvic X-ray of a male patient* Tell me the 2 abnormalities here.
Lhui: Uh... There's a fractured right neck of femur... and... *squints*
Reg 1: Yup... what else? See this loop of bowel hanging down here? That's an inguinal hernia.
Lhui: Ooo....
Reg 2: And there's a 3rd abnormality!! This here's a negative John Doodle sign!!
Reg 1: *Laughs* Yes, very important... the John Doodle sign!
Lhui: Huh?
Reg 2: See... *points at the penis shadow* His doodle is pointing away from the pathology, so that's a negative John Doodle sign. A positive John Doodle is when it's pointing towards the pathology... *grins* 50% of the time, it will be positive and the other 50% will be negative.
Lhui: *WTF???*
Reg 3: They're not going to ask students that in the exams!! And it's John THOMAS, not John Doodle!
Reg 1: Can't say penis 'cos it's 'rude' , so you gotta say doodle instead.....
Registrar 1: Hey Leng, come here. Have a look at this.
Lhui: ???
Reg 1: *Shows a pelvic X-ray of a male patient* Tell me the 2 abnormalities here.
Lhui: Uh... There's a fractured right neck of femur... and... *squints*
Reg 1: Yup... what else? See this loop of bowel hanging down here? That's an inguinal hernia.
Lhui: Ooo....
Reg 2: And there's a 3rd abnormality!! This here's a negative John Doodle sign!!
Reg 1: *Laughs* Yes, very important... the John Doodle sign!
Lhui: Huh?
Reg 2: See... *points at the penis shadow* His doodle is pointing away from the pathology, so that's a negative John Doodle sign. A positive John Doodle is when it's pointing towards the pathology... *grins* 50% of the time, it will be positive and the other 50% will be negative.
Lhui: *WTF???*
Reg 3: They're not going to ask students that in the exams!! And it's John THOMAS, not John Doodle!
Reg 1: Can't say penis 'cos it's 'rude' , so you gotta say doodle instead.....
Lhui: -_-"
For those of you who are scratching your head now, it's just a radiology joke. But the John Thomas sign really does exist. Though it has no medical significance whatsoever and radiologists probably use it to humour themselves when they're bored. Check it out:
http://www.whonamedit.com/synd.cfm/3050.html
(From Wikipedia)
The John Thomas sign, also known as the Throckmorton sign, is the position of a penis as it relates to pathology on an x-ray of a pelvis. When the penis (visible on the x-ray as a shadow) points towards the same side as a unilateral medical condition (such as a broken bone), this is considered a "positive John Thomas sign", and if the shadow points to the other side, it is a negative John Thomas sign. This sign is of no medical significance and is employed as a humorous aside.[citation needed]
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