A patient presents with a pruritic, erythematous rash with scaly plaques and satellite papules and pustules in the inguinal folds and gluteal cleft. The patient reports recent antibiotic use for a urinary tract infection. Which of the following conditions is most likely responsible for this presentation?

Correct Answer: A

Rationale: The presentation described indicates a candidal infection, which commonly occurs in warm, moist body areas like inguinal folds and gluteal cleft. The pruritic, erythematous rash with scaly plaques and satellite papules and pustules is characteristic of cutaneous candidiasis. The recent antibiotic use for urinary tract infection likely disrupted the normal skin flora, predisposing the patient to a Candida overgrowth. Tinea cruris (jock itch) can also present similarly, but the presence of satellite papules and pustules is more indicative of candidiasis. Erythrasma typically presents as well-defined brown-red patches without satellite lesions, and intertrigo is a more generic term referring to inflammation of skin folds that can have various causes, including candidiasis.

Correct Answer: A

Rationale: The patient's presentation of recurrent episodes of sudden, severe vertigo lasting hours, along with nausea, vomiting, nystagmus, and unilateral weakness on vestibular function tests, is most consistent with vestibular neuritis. Vestibular neuritis is an inflammatory disorder of the vestibular nerve, typically viral in origin, leading to acute onset of vertigo. Patients often experience severe vertigo, imbalance, nausea, and vomiting, along with characteristic nystagmus. Unilateral weakness on vestibular function testing supports the diagnosis of vestibular neuritis, as it indicates dysfunction of one vestibular organ. Benign paroxysmal positional vertigo (BPPV) typically presents with brief episodes of vertigo triggered by changes in head position without associated unilateral vestibular weakness. Ménière's disease is characterized by recurrent episodes of vertigo associated with fluctuating hearing loss, tinnitus, and aural fullness, and

Correct Answer: A

Rationale: The patient's presentation of recurrent episodes of sudden, severe vertigo lasting hours with nausea, vomiting, and nystagmus, along with unilateral weakness on vestibular function tests, is most consistent with vestibular neuritis. Vestibular neuritis is characterized by inflammation of the vestibular nerve leading to sudden onset vertigo that can last for hours to days. It is often associated with nausea, vomiting, and nystagmus. Unilateral weakness on vestibular function tests indicates dysfunction of one vestibular system. Differential diagnosis for this type of presentation includes other conditions such as Meniere's disease, BPPV, and acoustic neuroma. However, the combination of symptoms and unilateral vestibular weakness makes vestibular neuritis the most likely diagnosis in this case.

Correct Answer: A

Rationale: The presentation of painless, progressive visual field loss, especially in the peripheral vision, along with an open iridocorneal angle is characteristic of open-angle glaucoma. Open-angle glaucoma is a type of glaucoma where there is no physical obstruction to the outflow of aqueous humor from the eye, but there is gradual damage to the optic nerve over time. The gradual loss of peripheral vision is a common early symptom of open-angle glaucoma. It is essential to diagnose and manage open-angle glaucoma promptly to prevent irreversible vision loss.

Correct Answer: A

Rationale: The presentation described is consistent with anterior uveitis. Anterior uveitis involves inflammation of the iris and ciliary body. Patients typically present with symptoms such as redness, pain, photophobia, and blurred vision. The slit-lamp examination findings of ciliary injection (redness and dilation of blood vessels in the iris and ciliary body), corneal edema, and a mid-dilated pupil with a fixed reaction to light (due to ciliary muscle spasm causing decreased accommodation) are characteristic of anterior uveitis. This condition is often idiopathic but can be associated with various systemic diseases like ankylosing spondylitis, inflammatory bowel disease, and other autoimmune disorders. Treatment involves addressing the inflammation with topical corticosteroids and, in some cases, cycloplegic agents to reduce pain and inflammation.