CCAM Type I is defined by which characteristic?

CCAM Type I is defined by which characteristic?

• A. One Or More Cysts Larger Than 2 Cm
• B. Multiple Small Cysts Less Than 2 Cm
• C. Multiple Micro Cysts That Appear As A Solid Mass
• D. A Single Cyst Greater Than 2 Cm

Answer: (A)

Type I is the macrocystic form of CCAM, defined by cysts that are large in size—typically greater than 2 cm in diameter. On ultrasound you look for one or more sizable cystic spaces in the lung, rather than a solid-appearing mass. This macrocystic pattern distinguishes Type I from other CCAM types: Type II has multiple small cysts, each less than 2 cm, and Type III looks like a solid mass due to numerous tiny microcysts. A single cyst greater than 2 cm fits the macrocystic description, which is why the broader statement “one or more cysts larger than 2 cm” best defines Type I.

Type I is the macrocystic form of CCAM, defined by cysts that are large in size—typically greater than 2 cm in diameter. On ultrasound you look for one or more sizable cystic spaces in the lung, rather than a solid-appearing mass. This macrocystic pattern distinguishes Type I from other CCAM types: Type II has multiple small cysts, each less than 2 cm, and Type III looks like a solid mass due to numerous tiny microcysts. A single cyst greater than 2 cm fits the macrocystic description, which is why the broader statement “one or more cysts larger than 2 cm” best defines Type I.