ARDMS BREAST REGISTRY ACTUAL EXAM 2026 | Study
Guide with Newest Questions and Correct Detailed Answers
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Section 1: Breast Anatomy, Embryology & Physiology (15 questions)
Q1: During embryologic development, the mammary ridges (milk lines) extend from
which anatomical locations?
A. Axilla to the umbilicus
B. Axilla to the inguinal region [CORRECT]
C. Sternum to the mid-axillary line
D. Clavicle to the xiphoid process
Correct Answer: B
Rationale: On the ARDMS Breast Registry, remember that the mammary ridges extend
from the axilla to the inguinal region during weeks 6-8 of gestation. That's why
accessory breast tissue can develop anywhere along this line, most commonly in the
axilla.
Q2: A 32-year-old lactating patient presents for breast ultrasound. Which hormone is
primarily responsible for milk ejection during breastfeeding?
A. Prolactin
B. Oxytocin [CORRECT]
C. Estrogen
D. Progesterone
Correct Answer: B
,Rationale: While prolactin stimulates milk production, oxytocin triggers the milk ejection
reflex (let-down). This is a common registry distinction—knowing which hormone does
what in the lactation cycle.
Q3: The terminal ductal lobular unit (TDLU) is the functional unit of the breast. Which
statement about the TDLU is correct?
A. It is primarily responsible for lymphatic drainage
B. It is the site of origin for most breast pathologies, both benign and malignant
[CORRECT]
C. It contains only large lactiferous ducts
D. It is located exclusively in the retromammary space
Correct Answer: B
Rationale: The TDLU is where most breast diseases originate—fibrocystic changes,
fibroadenomas, and the majority of carcinomas (DCIS and invasive) all start here. That's
a fundamental registry concept.
Q4: Which artery is the primary blood supply to the upper outer quadrant of the breast?
A. Internal mammary artery
B. Lateral thoracic artery [CORRECT]
C. Intercostal arteries
D. Thoracoacromial artery
Correct Answer: B
Rationale: The lateral thoracic artery, a branch of the axillary artery, supplies the upper
outer quadrant and axillary tail. The internal mammary artery primarily supplies the
medial breast, making this a key vascular distinction for the registry.
,Q5: During a breast ultrasound, the sonographer identifies a structure deep to the
retromammary space. Which anatomical layer is being visualized?
A. Pectoralis major muscle [CORRECT]
B. Cooper's ligaments
C. Subcutaneous fat
D. Mammary parenchyma
Correct Answer: A
Rationale: Deep to the retromammary space lies the pectoralis major muscle, with the
pectoralis minor and chest wall structures further deep. The retromammary space itself
is a thin layer of loose areolar tissue.
Q6: A premenopausal patient undergoes breast ultrasound during the first week of her
menstrual cycle. Which physiologic change is most likely to be observed?
A. Minimal ductal prominence and low parenchymal density
B. Increased ductal prominence and breast edema due to estrogen influence [CORRECT]
C. Complete lobular involution
D. Predominantly fatty replacement
Correct Answer: B
Rationale: During the follicular phase, estrogen causes ductal proliferation and
increased breast edema. This affects sonographic appearance and explains why
screening is often scheduled during the second week when hormonal influence is
reduced.
Q7: Which lymph node group is located medial to the pectoralis minor muscle and
lateral to the chest wall?
, A. Level I axillary nodes
B. Level II axillary nodes [CORRECT]
C. Level III axillary nodes
D. Internal mammary nodes
Correct Answer: B
Rationale: Level II nodes are posterior to the pectoralis minor muscle, between its
medial and lateral borders. Level I is lateral to the muscle, Level III is medial/superior
(infraclavicular), and internal mammary nodes follow the internal mammary vessels.
Q8: The nipple-areolar complex receives its primary sensory innervation from which
nerve?
A. Intercostobrachial nerve
B. Lateral cutaneous branches of intercostal nerves (T4) [CORRECT]
C. Thoracodorsal nerve
D. Long thoracic nerve
Correct Answer: B
Rationale: The T4 intercostal nerve provides the principal sensory supply to the
nipple-areolar complex. This explains referred breast pain patterns and is relevant for
understanding post-surgical sensory changes.
Q9: Which structure suspends the breast lobes and attaches to the skin, giving the
breast its structural support?
A. Retromammary fascia
B. Cooper's suspensory ligaments [CORRECT]
C. Pectoralis major fascia
D. Mammary ducts
Guide with Newest Questions and Correct Detailed Answers
Verified | Pass Guaranteed - A+ Graded
Section 1: Breast Anatomy, Embryology & Physiology (15 questions)
Q1: During embryologic development, the mammary ridges (milk lines) extend from
which anatomical locations?
A. Axilla to the umbilicus
B. Axilla to the inguinal region [CORRECT]
C. Sternum to the mid-axillary line
D. Clavicle to the xiphoid process
Correct Answer: B
Rationale: On the ARDMS Breast Registry, remember that the mammary ridges extend
from the axilla to the inguinal region during weeks 6-8 of gestation. That's why
accessory breast tissue can develop anywhere along this line, most commonly in the
axilla.
Q2: A 32-year-old lactating patient presents for breast ultrasound. Which hormone is
primarily responsible for milk ejection during breastfeeding?
A. Prolactin
B. Oxytocin [CORRECT]
C. Estrogen
D. Progesterone
Correct Answer: B
,Rationale: While prolactin stimulates milk production, oxytocin triggers the milk ejection
reflex (let-down). This is a common registry distinction—knowing which hormone does
what in the lactation cycle.
Q3: The terminal ductal lobular unit (TDLU) is the functional unit of the breast. Which
statement about the TDLU is correct?
A. It is primarily responsible for lymphatic drainage
B. It is the site of origin for most breast pathologies, both benign and malignant
[CORRECT]
C. It contains only large lactiferous ducts
D. It is located exclusively in the retromammary space
Correct Answer: B
Rationale: The TDLU is where most breast diseases originate—fibrocystic changes,
fibroadenomas, and the majority of carcinomas (DCIS and invasive) all start here. That's
a fundamental registry concept.
Q4: Which artery is the primary blood supply to the upper outer quadrant of the breast?
A. Internal mammary artery
B. Lateral thoracic artery [CORRECT]
C. Intercostal arteries
D. Thoracoacromial artery
Correct Answer: B
Rationale: The lateral thoracic artery, a branch of the axillary artery, supplies the upper
outer quadrant and axillary tail. The internal mammary artery primarily supplies the
medial breast, making this a key vascular distinction for the registry.
,Q5: During a breast ultrasound, the sonographer identifies a structure deep to the
retromammary space. Which anatomical layer is being visualized?
A. Pectoralis major muscle [CORRECT]
B. Cooper's ligaments
C. Subcutaneous fat
D. Mammary parenchyma
Correct Answer: A
Rationale: Deep to the retromammary space lies the pectoralis major muscle, with the
pectoralis minor and chest wall structures further deep. The retromammary space itself
is a thin layer of loose areolar tissue.
Q6: A premenopausal patient undergoes breast ultrasound during the first week of her
menstrual cycle. Which physiologic change is most likely to be observed?
A. Minimal ductal prominence and low parenchymal density
B. Increased ductal prominence and breast edema due to estrogen influence [CORRECT]
C. Complete lobular involution
D. Predominantly fatty replacement
Correct Answer: B
Rationale: During the follicular phase, estrogen causes ductal proliferation and
increased breast edema. This affects sonographic appearance and explains why
screening is often scheduled during the second week when hormonal influence is
reduced.
Q7: Which lymph node group is located medial to the pectoralis minor muscle and
lateral to the chest wall?
, A. Level I axillary nodes
B. Level II axillary nodes [CORRECT]
C. Level III axillary nodes
D. Internal mammary nodes
Correct Answer: B
Rationale: Level II nodes are posterior to the pectoralis minor muscle, between its
medial and lateral borders. Level I is lateral to the muscle, Level III is medial/superior
(infraclavicular), and internal mammary nodes follow the internal mammary vessels.
Q8: The nipple-areolar complex receives its primary sensory innervation from which
nerve?
A. Intercostobrachial nerve
B. Lateral cutaneous branches of intercostal nerves (T4) [CORRECT]
C. Thoracodorsal nerve
D. Long thoracic nerve
Correct Answer: B
Rationale: The T4 intercostal nerve provides the principal sensory supply to the
nipple-areolar complex. This explains referred breast pain patterns and is relevant for
understanding post-surgical sensory changes.
Q9: Which structure suspends the breast lobes and attaches to the skin, giving the
breast its structural support?
A. Retromammary fascia
B. Cooper's suspensory ligaments [CORRECT]
C. Pectoralis major fascia
D. Mammary ducts
