Measles vs Rubella

[rlanders85]

Question about rash...
From 2013 FA (p.161): rash of Measles "includes hands and feet (vs truncal rash in rubella)"

Since this is the first time I have come across this I tried finding a source to verify but was unsuccessful. I know there are more high-yield associations to differentiate these 2 conditions, but my OCD always prevails! Anyhow, has anyone come across this before? I always thought they had similar presentation (spreads from head to toe)..

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[Myxedema]

Are you thinking about the "CARS" mnemonic? Coxsackie A, RMSF, Syphilis
As for measles vs. rubella, I couldn't confirm that rubella does not involve palms & soles:

Measles, Nelson Textbook of Pediatrics, 19th Edition, p. 1070: "The rash begins on the forehead (around the hairline), behind the ears, and on the upper neck as a red maculopapular eruption. It then spreads downward to the torso and extremities, reaching the palms and soles in up to 50% of cases. The exanthem frequently becomes confluent on the face and upper trunk. With the onset of the rash, symptoms begin to subside. The rash fades over about 7 days in the same progression as it evolved, often leaving a fine desquamation of skin in its wake."
Rubella, Nelson Textbook of Pediatrics, 19th Edition, p. 1076: "In children, the 1st manifestation of rubella is usually the rash, which is variable and not distinctive. It begins on the face and neck as small, irregular pink macules that coalesce, and it spreads centrifugally to involve the torso and extremities, where it tends to occur as discrete macules. About the time of onset of the rash, examination of the oropharynx may reveal tiny, rose-colored lesions (Forchheimer spots) or petechial hemorrhages on the soft palate. The rash fades from the face as it extends to the rest of the body so that the whole body may not be involved at any 1 time. The duration of the rash is generally 3 days, and it usually resolves without desquamation."​

The way I've always remembered is that fever + rash of rubella is similar to measles, but only less severe.

 

[rlanders85]

Thanks for the reply. I think since it's so hard to find a source probably not testable item.. I wonder where FA got this info from