What is the maximum diameter of the Terminal Ductal Lobular Unit?

What is the maximum diameter of the Terminal Ductal Lobular Unit?

• A. 2 mm
• B. 5 mm
• C. 1 cm
• D. 0.5 mm

Answer: (A)

The key idea is the tiny size of the terminal ductal lobular unit, a microscopic component of breast tissue where milk ducts and lobules meet. These units are only a few millimeters across, and the largest measurements typically cited are around 2 mm. That makes 2 mm the correct choice, since 5 mm or 1 cm would be macroscopic and not representative of a TDLU, while 0.5 mm is smaller than the commonly reported maximum. So, the maximum diameter of the TDLU is about 2 mm.

The key idea is the tiny size of the terminal ductal lobular unit, a microscopic component of breast tissue where milk ducts and lobules meet. These units are only a few millimeters across, and the largest measurements typically cited are around 2 mm. That makes 2 mm the correct choice, since 5 mm or 1 cm would be macroscopic and not representative of a TDLU, while 0.5 mm is smaller than the commonly reported maximum. So, the maximum diameter of the TDLU is about 2 mm.