Breast lymphatic drainage US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Breast lymphatic drainage. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Breast lymphatic drainage US Medical PG Question 1: A 64-year-old woman presents to the surgical oncology clinic as a new patient for evaluation of recently diagnosed breast cancer. She has a medical history of type 2 diabetes mellitus for which she takes metformin. Her surgical history is a total knee arthroplasty 7 years ago. Her family history is insignificant. Physical examination is notable for an irregular nodule near the surface of her right breast. Her primary concern today is which surgical approach will be chosen to remove her breast cancer. Which of the following procedures involves the removal of a portion of a breast?
- A. Arthroplasty
- B. Lumpectomy (Correct Answer)
- C. Vasectomy
- D. Mastectomy
- E. Laminectomy
Breast lymphatic drainage Explanation: ***Lumpectomy***
- A **lumpectomy** is a surgical procedure that removes the **breast cancer tumor** and a small margin of surrounding healthy tissue, preserving most of the breast.
- This procedure is a common treatment for early-stage breast cancer and is often followed by radiation therapy.
*Arthroplasty*
- **Arthroplasty** is a surgical procedure to **repair or replace a joint**, typically due to arthritis or injury.
- The patient's history of a total knee arthroplasty indicates this procedure was performed on her knee, not her breast.
*Vasectomy*
- A **vasectomy** is a surgical procedure for **male sterilization**, involving the cutting and sealing of the vas deferens.
- This procedure is unrelated to breast cancer treatment or breast surgery.
*Mastectomy*
- A **mastectomy** involves the **complete surgical removal of the entire breast**, often including the nipple and areola.
- While it is a breast surgery, it removes the *entire* breast, not just a portion.
*Laminectomy*
- A **laminectomy** is a surgical procedure that removes a portion of the **vertebra (lamina)** to relieve pressure on the spinal cord or nerves.
- This procedure is for spinal conditions and is entirely unrelated to breast cancer surgery.
Breast lymphatic drainage US Medical PG Question 2: A 32-year-old man comes to the emergency department because of a wound in his foot. Four days ago, he stepped on a nail while barefoot at the beach. Examination of the plantar surface of his right foot shows a purulent puncture wound at the base of his second toe with erythema and tenderness of the surrounding skin. The afferent lymphatic vessels from the site of the lesion drain directly into which of the following groups of regional lymph nodes?
- A. Popliteal
- B. Deep inguinal
- C. Anterior tibial
- D. Superficial inguinal (Correct Answer)
- E. External iliac
Breast lymphatic drainage Explanation: ***Superficial inguinal***
- Lymph from the **plantar surface of the foot** (including the base of the toes) drains into the **superficial inguinal lymph nodes**.
- The **medial and central plantar surfaces** specifically follow the medial superficial lymphatic vessels that accompany the great saphenous vein system to reach these nodes.
- These nodes are the **primary drainage site** and crucial in the initial immune response to infections of the lower limb.
*Popliteal*
- The **popliteal lymph nodes** primarily drain lymph from the **lateral foot and heel**, posterior leg, and knee.
- They are located within the popliteal fossa and would not be the direct drainage site for a wound on the plantar surface of the second toe.
*Deep inguinal*
- **Deep inguinal lymph nodes** receive lymph from the superficial inguinal nodes, as well as from deeper structures of the thigh and glans penis/clitoris.
- They are considered a **secondary drainage site** and not the primary destination for superficial foot infections.
*Anterior tibial*
- There are no well-defined major lymph nodes specifically termed "anterior tibial" that serve as a primary drainage site for the foot.
- Lymphatics generally follow venous drainage patterns, and the anterior tibial vessels drain superiorly, not to a specific nodal group at this level.
*External iliac*
- **External iliac lymph nodes** receive lymph primarily from the deep inguinal nodes and pelvic organs.
- They are a more **proximal group** in the lymphatic chain and not the direct initial drainage site for a foot infection.
Breast lymphatic drainage US Medical PG Question 3: A 39-year-old man presents with painless swelling of the right testis and a sensation of heaviness. The physical examination revealed an intra-testicular solid mass that could not be felt separately from the testis. After a thorough evaluation, he was diagnosed with testicular seminoma. Which of the following group of lymph nodes are most likely involved?
- A. Superficial inguinal lymph nodes (lateral group)
- B. Deep inguinal lymph nodes
- C. Superficial inguinal lymph nodes (medial group)
- D. Para-rectal lymph nodes
- E. Para-aortic lymph nodes (Correct Answer)
Breast lymphatic drainage Explanation: ***Para-aortic lymph nodes***
- The **testes** develop in the abdomen and descend into the scrotum, retaining their original lymphatic drainage. Therefore, **testicular cancer** typically metastasizes to the **para-aortic** (or retroperitoneal) lymph nodes, which are located near the renal veins at the level of L1-L2.
- This is the primary lymphatic drainage pathway for the testes.
*Superficial inguinal lymph nodes (lateral group)*
- These lymph nodes primarily drain the skin of the **scrotum**, perineum, and lower limbs, but not the **testes** themselves.
- Involvement would suggest spread to the scrotal skin or compromised lymphatic flow due to prior scrotal surgery or infection, which is not indicated here.
*Deep inguinal lymph nodes*
- **Deep inguinal lymph nodes** drain structures deeper in the leg and gluteal region, as well as receiving efferent vessels from the superficial inguinal nodes.
- They are not the primary drainage site for the **testes**.
*Superficial inguinal lymph nodes (medial group)*
- Similar to the lateral group, the **medial superficial inguinal lymph nodes** primarily drain the external genitalia (excluding the testes), perineum, and lower abdominal wall.
- They are not the direct drainage route for **testicular cancer**.
*Para-rectal lymph nodes*
- **Para-rectal lymph nodes** are located near the rectum and are involved in the drainage of the rectum and lower sigmoid colon.
- They have no direct connection to the lymphatic drainage of the **testes**.
Breast lymphatic drainage US Medical PG Question 4: A 52-year-old woman visits your office complaining about discharge from her left nipple for the past 3 months. The discharge looks like gray greenish and its amount is progressively increasing. She appears to be anxious and extremely uncomfortable with this situation as it is embarrassing for her when it occurs outdoors. Past medical history is insignificant. Her family history is negative for breast and ovarian disorders. She tries to stay active by running for 30 minutes every day on a treadmill, staying away from smoking, and by eating a balanced diet. She drinks alcohol occasionally. During physical examination you find a firm, stable mass under an inverted nipple in her left breast; while on the right breast, dilated subareolar ducts can be noted. There is no lymphadenopathy and remaining of the physical exam is normal. A mammogram is performed which reveals tubular calcifications. Which of the following is the most likely diagnosis?
- A. Duct ectasia (Correct Answer)
- B. Periareolar fistula
- C. Intraductal papilloma
- D. Periductal mastitis
- E. Phyllodes tumor
Breast lymphatic drainage Explanation: ***Duct ectasia***
- The patient's presentation with **gray-green nipple discharge**, an **inverted nipple**, and **tubular calcifications on mammogram** are classic signs of duct ectasia in a postmenopausal woman.
- The presence of **dilated subareolar ducts** in the contralateral breast further supports this diagnosis, as it is a benign condition characterized by widening of the breast ducts.
*Periareolar fistula*
- This condition is typically associated with recurrent **subareolar abscesses** and chronic drainage, often from a nipple piercing or previous infection, which are not described here.
- Periareolar fistulas rarely present solely with gray-green discharge and tubular calcifications without a clear history of infection or abscess.
*Intraductal papilloma*
- Intraductal papillomas usually present with **serous or bloody nipple discharge**, rather than the gray-green discharge seen in this patient.
- While they can cause nipple discharge, they are not typically associated with **inverted nipples** or **tubular calcifications** on mammogram.
*Periductal mastitis*
- Periductal mastitis is an inflammatory condition that can cause nipple inversion and discharge, but the discharge is usually **purulent or inflammatory**, and it is often accompanied by signs of infection like pain, redness, and swelling, which are absent in this case.
- It is more commonly seen in **smokers**, whereas this patient is a non-smoker.
*Phyllodes tumor*
- Phyllodes tumors usually present as a **rapidly growing palpable breast mass**, which may be benign or malignant, but they are not typically associated with nipple discharge or tubular calcifications.
- The description of **gray-green discharge** and **tubular calcifications** does not align with the typical presentation of a phyllodes tumor.
Breast lymphatic drainage US Medical PG Question 5: A 62-year-old woman presents to her physician with a painless breast mass on her left breast for the past 4 months. She mentions that she noticed the swelling suddenly one day and thought it would resolve by itself. Instead, it has been slowly increasing in size. On physical examination of the breasts, the physician notes a single non-tender, hard, and fixed nodule over left breast. An ultrasonogram of the breast shows a solid mass, and a fine-needle aspiration biopsy confirms the mass to be lobular carcinoma of the breast. When the patient asks about her prognosis, the physician says that the prognosis can be best determined after both grading and staging of the tumor. Based on the current diagnostic information, the physician says that they can only grade, but no stage, the neoplasm. Which of the following facts about the neoplasm is currently available to the physician?
- A. The tumor invades the pectoralis major.
- B. The tumor has spread via blood-borne metastasis.
- C. The tumor has not metastasized to the contralateral superior mediastinal lymph nodes.
- D. The tumor has metastasized to the axillary lymph nodes.
- E. The tumor cells exhibit marked nuclear atypia. (Correct Answer)
Breast lymphatic drainage Explanation: ***The tumor cells exhibit marked nuclear atypia.***
- **Grading** assesses the **histological appearance** of cancer cells and tissues, including features like nuclear atypia, mitotic rate, and architectural features, which are directly observable from the **fine-needle aspiration biopsy**.
- **Nuclear atypia** refers to abnormal changes in the size, shape, and chromatin pattern of cell nuclei, indicating a higher degree of anaplasia and aggressiveness.
*The tumor invades the pectoralis major.*
- **Invasion into surrounding tissues**, especially muscle, is a feature determined during **surgical staging** or comprehensive imaging, which is not described as being performed yet.
- This information relates to the **"T" (tumor size/extension)** component of TNM staging, which cannot be fully assessed with only a biopsy.
*The tumor has spread via blood-borne metastasis.*
- **Distant metastasis** is part of the **"M" (metastasis)** component of TNM staging, requiring imaging studies (e.g., PET scan, CT scan) or biopsies of suspected metastatic sites.
- The current diagnostic information (biopsy of the primary tumor) does not provide details about **blood-borne spread**.
*The tumor has not metastasized to the contralateral superior mediastinal lymph nodes.*
- Information about **lymph node involvement**, even in distant locations like the mediastinum, falls under the **"N" (nodes)** component of TNM staging, which requires thorough imaging or surgical dissection.
- The current biopsy focuses on the primary breast mass and cannot rule out distant lymph node metastasis.
*The tumor has metastasized to the axillary lymph nodes.*
- **Axillary lymph node metastasis** is also part of the **"N" component** of staging and is typically determined by sentinel lymph node biopsy or axillary dissection performed during surgery, or through imaging.
- A fine-needle aspiration of the primary breast mass does not provide information about regional lymph node involvement.
Breast lymphatic drainage US Medical PG Question 6: A 55-year-old woman comes to the physician with concerns about swelling and pain in her right breast. Physical examination shows erythema and prominent pitting of the hair follicles overlying the upper and lower outer quadrants of the right breast. There are no nipple changes or discharge. A core needle biopsy shows invasive carcinoma of the breast. Which of the following is the most likely explanation for this patient's skin findings?
- A. Infiltration of the lactiferous ducts
- B. Obstruction of the lymphatic channels (Correct Answer)
- C. Involution of the breast parenchyma and ductal system
- D. Tightening of the suspensory ligaments
- E. Bacterial invasion of the subcutaneous tissue
Breast lymphatic drainage Explanation: ***Obstruction of the lymphatic channels***
- The characteristic skin findings of **erythema** and **prominent pitting of the hair follicles** (peau d'orange) in the context of breast cancer are pathognomonic for **inflammatory breast cancer**.
- This appearance results from **tumor cells obstructing dermal lymphatic channels**, leading to localized fluid accumulation or lymphedema in the skin.
*Infiltration of the lactiferous ducts*
- While **ductal carcinoma** is a common type of breast cancer, infiltration of the lactiferous ducts alone doesn't directly cause a diffuse inflammatory skin change like *peau d'orange*.
- This type of infiltration often leads to nipple discharge or retraction, which are specifically noted as absent in this patient.
*Involution of the breast parenchyma and ductal system*
- **Involution** is a normal physiological process of breast tissue regression, typically with aging, and does not cause **inflammatory skin changes** or focal swelling.
- It is not associated with breast cancer or its characteristic skin manifestations.
*Tightening of the suspensory ligaments*
- Tightening of the **Cooper's ligaments** can occur with tumor infiltration, leading to skin dimpling or retraction, but not the diffuse **edema** and **erythema** characteristic of *peau d'orange*.
- This typically creates a puckering effect rather than the widespread pitting seen in this case.
*Bacterial invasion of the subcutaneous tissue*
- **Bacterial infections** (e.g., cellulitis) would typically present with more acute signs of infection such as fever, warmth, and rapidly spreading erythema, often with tenderness.
- The presented symptoms are chronic and associated with an underlying malignancy, rather than an infectious process.
Breast lymphatic drainage US Medical PG Question 7: A 59-year-old woman presents to the family medicine clinic with a lump in her breast for the past 6 months. She states that she has been doing breast self-examinations once a month. She has a medical history significant for generalized anxiety disorder and systemic lupus erythematosus. She takes sertraline and hydroxychloroquine for her medical conditions. The heart rate is 102/min, and the rest of the vital signs are stable. On physical examination, the patient appears anxious and tired. Her lungs are clear to auscultation bilaterally. Capillary refill is 2 seconds. There is no axillary lymphadenopathy present. Palpation of the left breast reveals a 2 x 2 cm mass. What is the most appropriate next step given the history of the patient?
- A. Mammography (Correct Answer)
- B. Continue breast self-examinations
- C. Referral to general surgery
- D. Biopsy of the mass
- E. Lumpectomy
Breast lymphatic drainage Explanation: ***Mammography***
- The presence of a **new breast mass** in a 59-year-old woman warrants immediate investigation to rule out malignancy.
- **Mammography** is the initial imaging modality of choice for evaluating breast lumps, especially in women over 40, and represents the most appropriate **first diagnostic step** after clinical examination.
- Standard workup follows the **triple assessment approach**: clinical examination (completed), imaging (mammography ± ultrasound), and tissue diagnosis (biopsy if imaging is suspicious).
- While this mass has been present for 6 months and will ultimately require biopsy if suspicious features are found, mammography is the appropriate initial imaging study to characterize the lesion and guide further management.
*Continue breast self-examinations*
- Continuing breast self-examinations alone is insufficient given the presence of a **palpable mass** that has persisted for 6 months.
- While self-exams are important for awareness, a new, persistent lump necessitates diagnostic evaluation, not just continued monitoring.
*Referral to general surgery*
- While surgical consultation may be necessary later, it is usually not the **immediate first step** before radiological evaluation.
- Referral to surgery without prior imaging would be premature and does not follow standard diagnostic algorithms.
*Biopsy of the mass*
- A **biopsy** is typically performed after initial imaging (mammography ± ultrasound) has characterized the mass.
- While biopsy will likely be needed given the 6-month duration of this palpable mass, mammography is the standard initial imaging study to perform first.
- Direct biopsy without imaging would miss the opportunity to evaluate the entire breast and axilla for multifocal disease or lymph node involvement.
*Lumpectomy*
- **Lumpectomy** is a therapeutic surgical procedure for excising a mass, not a diagnostic step.
- It is performed after a definitive diagnosis of cancer has been established via imaging and biopsy, along with appropriate staging.
- Performing a lumpectomy without prior diagnostic workup would be inappropriate and does not allow for proper surgical planning.
Breast lymphatic drainage US Medical PG Question 8: A 34-year-old Ethiopian woman who recently moved to the United States presents for evaluation to a surgical outpatient clinic with painful ulceration in her right breast for the last 2 months. She is worried because the ulcer is increasing in size. On further questioning, she says that she also has a discharge from her right nipple. She had her 2nd child 4 months ago and was breastfeeding the baby until the pain started getting worse in the past few weeks, and is now unbearable. According to her health records from Africa, her physician prescribed antimicrobials multiple times with a diagnosis of mastitis, but she did not improve significantly. Her mother and aunt died of breast cancer at 60 and 58 years of age, respectively. On examination, the right breast is enlarged and firm, with thickened skin, diffuse erythema, edema, and an ulcer measuring 3 × 3 cm. White-gray nipple discharge is present. The breast is tender with axillary and cervical adenopathy. Mammography is ordered, which shows a mass with a large area of calcifications, parenchymal distortion, and extensive soft tissue and trabecular thickening in the affected breast. The patient subsequently undergoes core-needle and full-thickness skin punch biospies. The pathology report states a clear dermal lymphatic invasion by tumor cells. Which of the following is the most likely diagnosis?
- A. Infiltrating ductal carcinoma
- B. Infiltrating lobular carcinoma
- C. Inflammatory breast cancer (Correct Answer)
- D. Ductal carcinoma in situ (DCIS)
- E. Lobular carcinoma in situ (LCIS)
Breast lymphatic drainage Explanation: ***Inflammatory breast cancer***
- The rapid onset of **diffuse erythema**, **edema** (peau d'orange appearance due to lymphatic involvement), **skin thickening**, ulceration, and the palpable **axillary and cervical adenopathy** are classic signs of inflammatory breast cancer.
- The mammographic findings of **parenchymal distortion**, extensive soft tissue, **trabecular thickening**, and especially the **dermal lymphatic invasion** by tumor cells on biopsy confirm this aggressive diagnosis.
*Infiltrating ductal carcinoma*
- While **infiltrating ductal carcinoma** is the most common type of breast cancer, it typically presents as a **palpable mass** or an abnormal mammogram finding without the prominent inflammatory signs seen here.
- It usually does not involve such widespread **dermal lymphatic invasion** and rapid progression with skin changes, unless it is a specific variant with inflammatory features.
*Infiltrating lobular carcinoma*
- This type of carcinoma often grows in a **diffuse pattern** and may not form a distinct mass, sometimes making it difficult to detect by mammography.
- However, it rarely presents with the prominent **inflammatory signs** (erythema, edema, skin thickening) and ulceration indicative of extensive dermal lymphatic involvement as described.
*Ductal carcinoma in situ (DCIS)*
- **DCIS** is a non-invasive form of breast cancer confined to the breast ducts, meaning it has not spread beyond the ductal basement membrane.
- It typically presents as **microcalcifications** on mammography and does not exhibit a rapidly progressing **painful ulceration**, **skin changes**, or **lymph node involvement**.
*Lobular carcinoma in situ (LCIS)*
- **LCIS** is a non-invasive condition that increases the risk of developing invasive breast cancer in either breast.
- It is an **incidental finding** on biopsy for another reason, does **not form a mass**, and does not cause the **clinical signs of inflammation**, skin changes, or ulceration.
Breast lymphatic drainage US Medical PG Question 9: A 28-year-old male presents to his primary care physician with complaints of intermittent abdominal pain and alternating bouts of constipation and diarrhea. His medical chart is not significant for any past medical problems or prior surgeries. He is not prescribed any current medications. Which of the following questions would be the most useful next question in eliciting further history from this patient?
- A. "Does the diarrhea typically precede the constipation, or vice-versa?"
- B. "Is the diarrhea foul-smelling?"
- C. "Please rate your abdominal pain on a scale of 1-10, with 10 being the worst pain of your life"
- D. "Are the symptoms worse in the morning or at night?"
- E. "Can you tell me more about the symptoms you have been experiencing?" (Correct Answer)
Breast lymphatic drainage Explanation: ***Can you tell me more about the symptoms you have been experiencing?***
- This **open-ended question** encourages the patient to provide a **comprehensive narrative** of their symptoms, including details about onset, frequency, duration, alleviating/aggravating factors, and associated symptoms, which is crucial for diagnosis.
- In a patient presenting with vague, intermittent symptoms like alternating constipation and diarrhea, allowing them to elaborate freely can reveal important clues that might not be captured by more targeted questions.
*Does the diarrhea typically precede the constipation, or vice-versa?*
- While knowing the sequence of symptoms can be helpful in understanding the **pattern of bowel dysfunction**, it is a very specific question that might overlook other important aspects of the patient's experience.
- It prematurely narrows the focus without first obtaining a broad understanding of the patient's overall symptomatic picture.
*Is the diarrhea foul-smelling?*
- Foul-smelling diarrhea can indicate **malabsorption** or **bacterial overgrowth**, which are important to consider in some gastrointestinal conditions.
- However, this is a **specific symptom inquiry** that should follow a more general exploration of the patient's symptoms, as it may not be relevant if other crucial details are missed.
*Please rate your abdominal pain on a scale of 1-10, with 10 being the worst pain of your life*
- Quantifying pain intensity is useful for assessing the **severity of discomfort** and monitoring changes over time.
- However, for a patient with intermittent rather than acute, severe pain, understanding the **character, location, and triggers** of the pain is often more diagnostically valuable than just a numerical rating initially.
*Are the symptoms worse in the morning or at night?*
- Diurnal variation can be relevant in certain conditions, such as inflammatory bowel diseases where nocturnal symptoms might be more concerning, or functional disorders whose symptoms might be stress-related.
- This is another **specific question** that should come after gathering a more complete initial picture of the patient's symptoms to ensure no key information is overlooked.
Breast lymphatic drainage US Medical PG Question 10: A 59-year-old woman presents to her primary care provider with a 6-month history of progressive left-arm swelling. Two years ago she had a partial mastectomy and axillary lymph node dissection for left breast cancer. She was also treated with radiotherapy at the time. Upon further questioning, she denies fever, pain, or skin changes, but reports difficulty with daily tasks because her hand feels heavy and weak. She is bothered by the appearance of her enlarged extremity and has stopped playing tennis. On physical examination, nonpitting edema of the left arm is noted with hyperkeratosis, papillomatosis, and induration of the skin. Limb elevation, exercise, and static compression bandaging are started. If the patient has no improvement, which of the following will be the best next step?
- A. Diethylcarbamazine
- B. Low molecular weight heparin
- C. Endovascular stenting
- D. Vascularized lymph node transfer (Correct Answer)
- E. Antibiotics
Breast lymphatic drainage Explanation: ***Vascularized lymph node transfer***
- This patient presents with **secondary lymphedema** due to axillary dissection and radiotherapy, which has not responded to conservative management.
- **Vascularized lymph node transfer** is a surgical option that involves transplanting healthy lymph nodes to the affected area to re-establish lymphatic drainage pathways, offering a more definitive solution for refractory cases.
*Diethylcarbamazine*
- **Diethylcarbamazine** is an anti-filarial drug used to treat lymphedema caused by **parasitic infections**, specifically filariasis.
- The patient's lymphedema is secondary to breast cancer treatment, not parasitic infection, making this a **misdirected treatment**.
*Low molecular weight heparin*
- **Low molecular weight heparin** is an anticoagulant used to prevent or treat **venous thromboembolism (VTE)**.
- While patients with cancer are at increased risk for VTE, her symptoms are consistent with lymphedema and not thrombosis, which would typically present with more acute pain and swelling, making this an inappropriate treatment.
*Endovascular stenting*
- **Endovascular stenting** is a procedure used to open blocked or narrowed **blood vessels**, such as in peripheral artery disease or venous obstruction.
- Her condition is specifically lymphedema, a lymphatic circulation issue, not a vascular obstruction, so stenting would not address the underlying problem.
*Antibiotics*
- **Antibiotics** are used to treat **bacterial infections**, which can complicate lymphedema (e.g., cellulitis).
- While chronic lymphedema causes skin changes (hyperkeratosis, papillomatosis, induration), the patient shows no signs of **acute infection** such as fever, pain, erythema, or warmth, making empirical antibiotics unnecessary at this stage.
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