How to Say "cat scan" in Spanish
The Spanish word for “cat scan” is “tac” — B1 level. This is a very common word in everyday Spanish.

Examples
El médico me mandó un TAC para ver el estado de mi rodilla.
The doctor ordered a CT scan to see the condition of my knee.
Los resultados del TAC estarán listos en tres días.
The CT scan results will be ready in three days.
No te preocupes, hacerse un TAC no duele nada.
Don't worry, getting a CT scan doesn't hurt at all.
A Word from Letters
This word is actually an acronym (a word made from first letters) for 'Tomografía Axial Computarizada.' In Spanish, many medical acronyms are spoken like regular words.
The Gender of TAC
Even though the main word 'tomografía' is feminine (la), this shortened version is almost always used as a masculine noun (el TAC).
Using the wrong gender
Mistake: “La TAC es mañana.”
Correction: El TAC es mañana. While 'la' is technically possible because of 'la tomografía,' almost everyone uses the masculine 'el' in conversation.
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