A 42 year-old warehouse worker presents with acute low back pain that began after lifting heavy boxes at work. The pain is described as a dull ache in the lumbosacral area and occasionally radiates into the buttocks, but does not extend below the knee. Neurologic examination reveals normal strength, sensation, and reflexes. Straight leg raise and crossed straight leg raise are negative. The pain is reproduced with lumbar movement and paraspinal palpation. Which diagnosis is most consistent with this presentation?

Lumbar spinal stenosis

Sciatica

Mechanical low back pain

Cauda equina syndrome

Answer and Explanation

The Correct Answer is C

Acute low back pain is commonly caused by musculoskeletal strain or ligamentous injury following physical exertion, especially lifting. Mechanical low back pain arises from overuse or strain of the lumbar muscles, ligaments, or facet joints rather than nerve root compression or spinal canal pathology. It typically presents with localized pain that is reproducible with movement or palpation and lacks neurological deficits. Distinguishing mechanical causes from neurologic or emergency conditions is essential for appropriate management.

Rationale:
A. Lumbar spinal stenosis typically presents with chronic, progressive lower back pain accompanied by neurogenic claudication, such as leg pain, numbness, or weakness that worsens with walking and improves with flexion or rest. It is more common in older adults and involves nerve root compression. The acute onset after lifting and absence of neurological findings make this diagnosis unlikely.

B. Sciatica results from compression or irritation of the lumbosacral nerve roots, leading to radiating pain that typically extends below the knee along the distribution of the sciatic nerve. It is often associated with positive straight leg raise tests and possible sensory or motor deficits. The absence of radicular symptoms and negative provocative tests argue against sciatica.

C. Mechanical low back pain is the most consistent diagnosis because it is caused by strain or injury to the lumbar musculature or supporting structures following physical activity such as lifting. Pain is typically localized to the lumbosacral region and may radiate to the buttocks but does not follow a dermatomal pattern or extend below the knee. Normal neurological examination and pain reproduced with movement and palpation strongly support a musculoskeletal origin.

D. Cauda equina syndrome is a medical emergency characterized by severe low back pain with bilateral leg weakness, saddle anesthesia, bladder or bowel dysfunction, and decreased reflexes. It results from compression of the cauda equina nerve roots and requires urgent surgical intervention. The absence of neurological deficits and bladder or bowel symptoms makes this diagnosis unlikely in this case.

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Correct Answer is D

Explanation

Breast masses in adults require careful evaluation based on consistency, mobility, tenderness, and border characteristics. Malignant breast lesions often present as hard, irregular, and poorly defined masses that are typically non-tender due to invasive growth into surrounding tissues. Risk increases with age, and new breast findings in a post-40 patient always warrant high suspicion for malignancy. Clinical breast examination findings guide urgency for imaging and biopsy.

Rationale:
A. Fibroadenoma is a benign breast tumor that commonly occurs in younger women and typically presents as a firm, smooth, well-circumscribed, and highly mobile mass. It is usually non-tender but has clearly defined borders, which distinguishes it from malignant lesions. The irregular shape and poorly delineated borders in this case are not consistent with fibroadenoma.

B. Lymphadenopathy refers to enlargement of lymph nodes, which may be palpable in the axillary region rather than within breast tissue itself. While it can be associated with infection or malignancy, it does not typically present as a firm, irregular breast mass with poorly defined borders. The location and characteristics described are more consistent with a primary breast lesion.

C. Breast cysts are fluid-filled sacs that commonly present as smooth, round, mobile, and sometimes tender masses that may fluctuate with the menstrual cycle. They often have well-defined borders and can change in size over time. The firm, irregular, non-tender nature of the mass described does not align with a benign cystic lesion.

D. Breast cancer is the most likely diagnosis because it typically presents as a hard, irregular, non-tender mass with poorly defined borders due to invasive growth into surrounding breast tissue. These lesions are often fixed or minimally mobile and may be detected on routine examination or imaging. In a 55-year-old patient with a new breast mass and no recent mammogram, malignancy must be highly suspected until proven otherwise.

A. Candidal vaginitis B. Trichomonal vaginitis C. Bacterial vaginosis D. Atrophic vaginitis

Correct Answer is C

Explanation

Vaginal infections are commonly differentiated based on discharge characteristics, microscopic findings, and associated symptoms. Bacterial vaginosis results from an imbalance in the normal vaginal flora, where lactobacilli are replaced by anaerobic bacteria. This leads to a characteristic thin, gray, fishy-smelling discharge. The presence of clue cells on wet mount is a key diagnostic feature, indicating vaginal epithelial cells coated with bacteria.

Rationale:
A. Candidal vaginitis is caused by overgrowth of Candida species and typically presents with thick, white, “cottage cheese-like” discharge accompanied by intense itching and vulvar irritation. It does not produce clue cells on wet mount. The discharge described in this case is thin, gray, and malodorous, which is inconsistent with candidiasis.

B. Trichomonal vaginitis is a sexually transmitted infection caused by Trichomonas vaginalis and is characterized by frothy, yellow-green discharge, vaginal irritation, and a “strawberry cervix” on examination. Motile trichomonads are seen on wet mount, not clue cells. The discharge characteristics and laboratory findings in this case do not align with trichomoniasis.

C. Bacterial vaginosis is the most appropriate diagnosis because it is defined by an imbalance in vaginal flora leading to overgrowth of anaerobic bacteria. It classically presents with thin, gray, malodorous discharge and a fishy odor, especially after intercourse. The presence of clue cells on wet mount is diagnostic, as these epithelial cells are coated with bacteria that obscure their borders.

D. Atrophic vaginitis occurs due to decreased estrogen levels, typically in postmenopausal women, leading to vaginal dryness, irritation, and dyspareunia. It does not present with malodorous discharge or clue cells. The patient’s age and laboratory findings make this diagnosis unlikely.

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Naxlex Comprehensive Predictor Exams

Correct Answer is D

Explanation

A 17 year-old cisgender female patient presents to the emergency department with complaints of thin, gray, malodorous vaginal discharge for 2 weeks. On laboratory wet mount, the advanced practice registered nurse (APRN) finds clue cells. What would be the most appropriate diagnosis for the patient?

Correct Answer is C

Explanation

A 78 year-old hospitalized patient becomes acutely confused, is disoriented to time, and has visual hallucinations that worsen at night. Which feature most strongly supports a diagnosis of delirium rather than dementia?

All of the following are visible signs of breast cancer EXCEPT

The advanced practice registered nurse (APRN) performs a routine check-up on a patient in the vascular surgery clinic. The APRN notices that they have a history of chronic arterial insufficiency. Which physical examination finding in the lower extremities would be expected?

During a neurologic assessment, the advanced practice registered nurse (APRN) notes that a patient keeps their eyes closed but opens them when spoken to loudly, answers questions appropriately, and then quickly falls back asleep. How should this level of consciousness be documented?