Thyroid questions start with the TSH and branch from there. These cover interpreting TSH with free T4, working up a palpable nodule, which ultrasound features raise concern, when biopsy is indicated, and how subclinical results should and should not change management.
Question 1
A 65-year-old diabetic patient presents with a suspicious 4-mm nodule located on the anterior lower leg. The FNP is planning a diagnostic biopsy.
- A) Perform a deep punch biopsy and leave the wound open.
- B) Perform a shave biopsy to minimize the risk of ulceration.✓
- C) Perform a wide excisional biopsy to ensure clear surgical margins.
- D) Perform a deep punch biopsy and close with absorbable sutures.
💡 Key Takeaway
Shave biopsies are preferred on the lower extremities of diabetic patients to prevent chronic non-healing ulcers.
Show rationale
The anterior lower leg is an area with notoriously poor vascular supply, a problem significantly compounded in diabetic patients. Creating a full-thickness defect in this area carries a high risk of poor healing and secondary infection. Therefore, a shave biopsy is the safest choice for a raised nodule, as it remains superficial and preserves the deeper dermal vascular plexus, allowing for faster secondary intention healing. Option A is incorrect because leaving a deep punch biopsy open on a diabetic leg almost guarantees a chronic ulcer. Option C is incorrect because a wide excisional biopsy creates an unnecessarily large full-thickness defect for an initial diagnosis. Option D is incorrect because even with sutures, full-thickness punch defects on the lower legs of diabetics frequently experience dehiscence and delayed healing due to high skin tension and poor perfusion.
Question 2
The FNP informs a 70-year-old male that his lung nodule is metastatic carcinoma. The patient begins to cry quietly and states, "I am not ready to leave my family." Which response aligns with the Empathy step?
- A) Let us review the palliative care options available to you now.
- B) I know exactly how you feel about leaving your family behind.
- C) It is completely understandable that this difficult news is upsetting you.✓
- D) Would you like me to call the hospital chaplain for you?
💡 Key Takeaway
The Empathy step requires validating the patient's emotions before moving to treatment planning or solutions.
Show rationale
When a patient expresses strong emotions, the Empathy step of the SPIKES protocol requires the clinician to acknowledge and validate those feelings before moving forward. Option C uses an empathic validating statement to support the patient. Option A inappropriately jumps to the Strategy step, ignoring the patient's immediate emotional distress. Option B uses a non-therapeutic approach; clinicians should never claim to know exactly how a patient feels, as it minimizes their unique experience. Option D attempts to fix the emotional response by deferring to a chaplain rather than directly addressing the emotion in the moment.
Question 3
A patient at 8 weeks gestation presents for her first obstetric visit. Routine labs reveal a TSH of 8.5 mIU/L and a low Free T4. She asks why starting medication is urgently needed. Which pathophysiologic rationale best explains the need for immediate treatment?
- A) It prevents maternal thyroid storm during the first trimester.
- B) It supports fetal neurocognitive development before fetal production.✓
- C) It reduces the risk of severe hyperemesis gravidarum.
- D) It stimulates the fetal thyroid gland to produce thyroxine.
💡 Key Takeaway
The fetus relies entirely on maternal thyroxine for neurocognitive development during the first trimester.
Show rationale
The fetus is entirely dependent on maternal thyroxine for central nervous system development until the fetal thyroid begins functioning around 12 to 14 weeks. Treating the mother ensures adequate hormone reaches the developing fetus. Option A is incorrect because hypothyroidism does not cause thyroid storm; thyrotoxicosis does. Option C is incorrect as hyperemesis is typically associated with elevated hCG causing transient hyperthyroidism, not hypothyroidism. Option D is incorrect because maternal levothyroxine does not stimulate the fetal gland; it directly supplies the necessary hormone the fetus cannot yet synthesize.
Question 4
A 62-year-old patient with a 10-year history of type 2 diabetes presents with progressive numbness in both feet. They have been on long-term metformin therapy with well-controlled blood glucose. Neurological examination reveals a distinct loss of proprioception and vibratory sense extending to the ankles, while pinprick sensation remains largely intact. Which diagnosis best explains these specific examination findings?
- A) Diabetic sensorimotor peripheral neuropathy
- B) Vitamin B12 deficiency peripheral neuropathy✓
- C) Chronic inflammatory demyelinating polyneuropathy
- D) Hypothyroid induced distal peripheral neuropathy
💡 Key Takeaway
Long-term metformin use increases the risk of B12 deficiency, which specifically impairs dorsal column sensory modalities.
Show rationale
You should suspect B12 deficiency because the patient has isolated loss of proprioception and vibratory sense, which are dorsal column functions. Long-term metformin use is a known risk factor for B12 malabsorption. While diabetic sensorimotor neuropathy is a strong consideration given the history, it typically presents with a loss of pain and temperature sensation (small fibers) before affecting large fibers. Chronic inflammatory demyelinating polyneuropathy presents with significant motor weakness, which is absent here. Hypothyroid neuropathy usually features delayed reflexes and carpal tunnel syndrome rather than isolated dorsal column dysfunction.
Question 5
A 28-year-old male reports a 10-pound weight loss, palpitations, and frequent loose stools over two months. Examination reveals a diffuse, non-tender goiter and a TSH of 0.01 mIU/L.
- A) Toxic multinodular goiter
- B) Hashimoto's autoimmune thyroiditis
- C) Graves' autoimmune hyperthyroidism✓
- D) Subacute granulomatous thyroiditis
💡 Key Takeaway
Graves' disease classically presents with a suppressed TSH, elevated thyroid hormones, and a diffuse, non-tender goiter.
Show rationale
Graves' autoimmune hyperthyroidism is the most common cause of hyperthyroidism in young adults, characterized by a suppressed TSH, diffuse non-tender goiter, and systemic hypermetabolic symptoms. Toxic multinodular goiter typically presents with palpable, distinct nodules rather than a smooth, diffuse enlargement. Hashimoto's autoimmune thyroiditis causes hypothyroidism with an elevated TSH. Subacute granulomatous thyroiditis presents with a distinctly tender thyroid gland, often following a viral infection, which is absent in this presentation.
Question 6
A 52-year-old female presents with a new-onset LDL of 170 mg/dL and recent unexplained weight gain. Her previous lipid panel two years ago was completely normal. She reports feeling unusually fatigued over the last few months.
- A) Order a comprehensive metabolic panel today.
- B) Order a thyroid stimulating hormone level.✓
- C) Order a hemoglobin A1c screening test.
- D) Order an apolipoprotein B laboratory level.
💡 Key Takeaway
Always evaluate for secondary causes like hypothyroidism when a patient presents with new-onset severe hyperlipidemia.
Show rationale
When a middle-aged adult presents with a sudden, unexplained worsening of their lipid profile alongside symptoms like weight gain and fatigue, you must evaluate for secondary causes of dyslipidemia. Hypothyroidism is a very common secondary cause of elevated LDL cholesterol. Ordering a thyroid stimulating hormone level is the most appropriate diagnostic step before initiating any lipid-lowering therapy. Option A is incorrect; while a metabolic panel checks liver and kidney function, it does not address the specific symptoms of fatigue and weight gain pointing directly to thyroid dysfunction. Option C is incorrect because although diabetes affects lipids, it typically raises triglycerides and lowers HDL rather than causing isolated LDL elevations. Option D is incorrect; apolipoprotein B can assess cardiovascular risk but does not identify the underlying secondary cause of this patient's new-onset hyperlipidemia.
Question 7
A 54-year-old kidney transplant recipient presents with a rapidly growing 1.5-cm tender nodule on his left forearm. The lesion has a central keratinous plug. Based on these findings, what is the most appropriate assessment and plan?
- A) Suspect basal cell carcinoma and schedule shave biopsy.
- B) Suspect squamous cell carcinoma and perform punch biopsy.✓
- C) Suspect an actinic keratosis and apply liquid nitrogen.
- D) Suspect a keratoacanthoma and recommend conservative clinical observation.
💡 Key Takeaway
Rapidly growing keratinous nodules in immunosuppressed patients require a punch biopsy to evaluate for squamous cell carcinoma.
Show rationale
Immunosuppressed patients, such as those who are a kidney transplant recipient, are at a significantly elevated risk for developing squamous cell carcinoma. A rapidly growing, tender nodule with a central keratinous plug is the classic presentation for a keratoacanthoma or an invasive squamous cell carcinoma. A punch biopsy is required to evaluate the depth of the lesion. Suspecting a basal cell carcinoma (A) is incorrect because BCC typically presents as a slow-growing, pearly papule rather than a rapid nodule with a keratinous plug. Suspecting an actinic keratosis (C) is inappropriate since AKs are flat, scaly precursor lesions, not thick nodules. Recommending conservative clinical observation for a suspected keratoacanthoma (D) is unsafe in an immunosuppressed patient due to the high risk of aggressive malignant transformation.
Question 8
A 30-year-old pregnant female at 16 weeks gestation is currently taking propylthiouracil 50 mg three times daily for Graves' disease. Her thyroid function tests are currently within the trimester-specific reference ranges. What is the most appropriate medication management plan at this visit?
- A) Maintain the current propylthiouracil regimen throughout the remainder of pregnancy.
- B) Discontinue all antithyroid medications since the first trimester has ended.
- C) Transition the patient from propylthiouracil to methimazole for the pregnancy.✓
- D) Increase the propylthiouracil dosage to prevent late-term fetal hyperthyroidism complications.
💡 Key Takeaway
Pregnant patients should transition from propylthiouracil to methimazole at the beginning of the second trimester.
Show rationale
Antithyroid medication management changes during pregnancy to balance teratogenic risks against maternal liver toxicity. While propylthiouracil is preferred in the first trimester to avoid methimazole-induced embryopathy, guidelines recommend transitioning to methimazole at the start of the second trimester (around 14 to 16 weeks gestation). This switch minimizes the mother's exposure to the hepatotoxic effects of propylthiouracil, which can cause fulminant liver failure. Option A is incorrect because continuing propylthiouracil unnecessarily prolongs the risk of severe maternal liver injury. Option B is incorrect because discontinuing therapy in a patient requiring treatment risks maternal thyrotoxicosis and fetal complications. Option D is incorrect because increasing the dose is unwarranted when current labs are stable, and it increases toxicity risks.
Question 9
A 34-year-old male presents with a fluctuant, erythematous 3-cm nodule located on the central upper lip and nasal base. He reports a 3-day history of worsening pain and a temperature of 101.2°F.
- A) Perform an immediate bedside incision and drainage.
- B) Prescribe oral antibiotics and reassess in two days.
- C) Aspirate the fluctuant lesion using a large-bore needle.
- D) Refer the patient to the emergency department promptly.✓
💡 Key Takeaway
Facial abscesses in the danger triangle require specialist referral due to the risk of cavernous sinus thrombosis.
Show rationale
Abscesses located in the danger triangle of the face pose a high risk for cavernous sinus thrombosis due to venous drainage patterns. Because this patient has a fever and a central facial lesion, immediate referral to the emergency department for intravenous antibiotics and specialist management is required. Performing an immediate bedside incision and drainage (Option A) or aspirating the lesion (Option C) is contraindicated due to the risk of spreading the infection into the central nervous system. Prescribing oral antibiotics and waiting (Option B) is inappropriate because it delays necessary aggressive systemic treatment for a potentially life-threatening complication.
Question 10
A 28-year-old female presents for a prenatal visit at 8 weeks gestation. She has a history of Graves' disease and is currently taking methimazole 10 mg daily. Her heart rate is 92 bpm, and she reports mild palpitations. What is the most appropriate pharmacological intervention for this patient?
- A) Continue the current methimazole dose and monitor closely.
- B) Discontinue the methimazole and initiate propylthiouracil therapy immediately.✓
- C) Increase the current methimazole dose to manage palpitations.
- D) Discontinue the methimazole and initiate radioactive iodine therapy.
💡 Key Takeaway
Propylthiouracil is the preferred antithyroid medication during the first trimester of pregnancy to avoid teratogenic risks.
Show rationale
Managing Graves disease during pregnancy requires careful medication selection to protect fetal development. Because this patient is at 8 weeks gestation, she is in the critical first trimester. Methimazole is associated with rare but severe congenital defects such as aplasia cutis and choanal atresia during this period. Therefore, propylthiouracil is the preferred antithyroid medication during the first trimester. Option A and Option C are incorrect because continuing or increasing methimazole exposes the developing fetus to unacceptable teratogenic risks. Option D is incorrect because radioactive iodine is strictly contraindicated throughout all stages of pregnancy due to irreversible fetal thyroid destruction. Transitioning the patient to propylthiouracil effectively mitigates fetal risk while adequately managing the mother's hyperthyroidism.
