You are here:

Breast Cancer/Simple Ovarian cyst


Hi Dr Nordquist,

I have been having Lower quadrant pain and after a internal Sono have been told that I have a 4.5 cm simple cyst.
I asked my dr to do an MRI thinking it would give me certainty that it is a simple cyst, which it did.
The MRI report read simple cyst at 5.7 cm x4.8

1) What is the percentage that this could be malignant? ( I am 45 with mirena IUD in)

2) Why the difference in size by different modality?

I was told if it doesn't go away in 5 weeks after repeat Sono then I will require surgery.

3) if it doesn't go away or gets bigger is that more likely to be cancer?

4) Can  mirena Iud contribute to cysts?

Many thanks!!!!!

1. The risk is VERY small but I can not give you an exact number. I doubt anyone can.
2. Because they are different modalities. They "see" the reality in different ways.
3. Yes but it is very unlikely that that will happen. It is also a statement given to avoid any legal complications.
4. This is something you have to ask your gynecologist. Not part of my work or my expertise here.

You can also reach me at:
There is no limit to the number of questions there. Please note: NEW SITE!

Donations are also always welcome! No amount is too small, no amount is too big!
The language problem I have had with the payment site has been solved!

Breast Cancer

All Answers

Answers by Expert:

Ask Experts


Claes-Gustaf Nordquist, M.D.


I`m a doctor of medicine and a specialist in radiation therapy and medical oncology. I have long experience in diagnostics and treatment of breast tumours.


I'm a Doctor of Medicine and specialist in Medical Oncology and Radiation Therapy educated & trained in Sweden. Now retired. Background in Radiation Therapy, Medical Oncology, Radiation Protection, Nuclear Medicine, Diagnostic Radiology, Gynecological Oncology, Clinical Pathology, Clinical Cytology,Hematology and Internal Medicine. M.D. from the faculty of medicine, Royal Karolinska Institute, Stockholm, Sweden. Have also been an exchange student at the Hebrew University, Hadassah Medical School, Jerusalem Israel. Former medical consultant, Swedish National Board of Radiation Protection. Former Police Surgeon and Medical Examiner, Stockholm Police Department. Former Chief Medical Officer, The Royal Guards, The Royal Horse Guards and the Royal Household Brigade, Royal Swedish Army Medical Corps.You can also reach me on: I have no restrictions on the number of questions there.

I also answer questions about Oncology (General Cancer), General History, Military History, Brain Tumors, Colon Cancer

I'm a medical doctor and specialist in medical oncology and radiation therapy.

©2017 All rights reserved.