Hi @belcar45,
"The liver is the largest organ in the human body. During development, liver size increases with increasing age, averaging 5 cm span at 5 years and attaining adult size by age 15. The size depends on several factors: age, sex, body size and shape, as well as the particular examination technique utilized (e.g., palpation versus percussion versus radiographic). By percussion, the mean liver size is 7 cm for women and 10.5 cm for men (Table 94.1). A liver span 2 to 3 cm larger or smaller than these values is considered abnormal. The liver weighs 1200 to 1400 g in the adult woman and 1400 to 1500 g in the adult man." https://www.ncbi.nlm.nih.gov/books/NBK421/#:~:text=By%20percussion%2C%20the%20mean%20liver,g%20in%20the%20adult%20man.

At 20.5 cm, your liver size can't be classifed as normal I wouldn't think.

While Waldenström's macroglobulinemia is a condition affecting the bone marrow, it can also affect the liver, lymph nodes, and spleen. An enlarged liver (hepatomegaly) is usually a sign of an underlying liver disease, congestive heart failure or cancer. I encourage you to get an appointment to have this investigated as soon as possible.