In pediatric trauma, inability to void with perineal bruising raises concern for urethral injury or urinary retention due to soft tissue swelling. The most immediate step is to attempt bladder catheterization. If unsuccessful, consult gynecology or urology urgently to avoid bladder overdistension.
Toronto Notes 2023 - Pediatrics, Genitourinary Trauma:
"In females, perineal trauma can lead to urinary retention due to labial hematomas or urethral injury. If catheterization is difficult, consult gynecology or urology for assistance." MCCQE1 Objectives - Pediatrics > Trauma and Emergency Care:
"Candidates must recognize when specialist consultation is required in pediatric genitourinary trauma, especially in cases of failed catheterization." Options B and D delay necessary care. Coagulation studies (C) may be considered if bleeding is unexplained.
Abuse assessment (E) may be necessary later but does not address immediate retention.

The presence of suicidal ideation in a minor mandates urgent assessment to ensure safety and access mental health care. Disclosure of sexual orientation should be handled delicately and is not urgent compared to suicidal risk.
Toronto Notes 2023 - Psychiatry, "Child and Adolescent Psychiatry" Section:
"Any adolescent disclosing suicidal ideation should be referred for urgent mental health evaluation.
Concurrent issues such as sexual orientation may contribute to distress and should be addressed with appropriate support over time." MCCQE1 Objectives (Psychiatry > 79-2: Suicide Risk Assessment):
"Candidates must immediately refer for psychiatric assessment when a minor reports suicidal ideation, regardless of other social or developmental concerns." Antidepressants (A) may be appropriate but must follow specialist evaluation. Encouraging disclosure (B) or peer groups (C) is premature without ensuring safety.

Comprehensive and Detailed Explanation:
This is a classic presentation of polymyalgia rheumatica (PMR), characterized by pain and stiffness in the shoulders and hips in older adults. PMR is closely associated with giant cell arteritis (GCA), which presents with unilateral headache, jaw claudication, visual symptoms, and scalp tenderness. Given the risk of vision loss with GCA, it's critical to screen for these symptoms in all patients with suspected PMR.
Toronto Notes 2023 - Rheumatology, PMR and GCA:
"Patients with PMR should be assessed for symptoms of GCA such as headache, visual changes, and jaw claudication. GCA can result in permanent vision loss if not promptly treated." MCCQE1 Objectives - Internal Medicine > Rheumatology:
"Candidates must identify signs of GCA in patients with PMR and understand the need for prompt diagnosis and treatment."

This case describes classic signs of delusional parasitosis (also known as Morgellons syndrome).However, the presence of widespread crusted lesions raises suspicion for crusted scabies, particularly in older adults.
Crusted scabies may be misinterpreted as chronic dermatitis or psychocutaneous disorder. The most effective treatment is oral ivermectin.
Toronto Notes 2023 - Dermatology:
"Crusted scabies presents as widespread hyperkeratotic plaques with crusting. First-line treatment is oral ivermectin, often with topical permethrin." MCCQE1 Objectives (Medicine > Dermatology > 23-1):
"Candidates must recognize presentations of ectoparasitic infections, including scabies, and provide appropriate treatment." Permethrin (B) is for typical scabies, but crusted scabies often requires systemic ivermectin due to severity and spread.

The patient describes classic symptoms of depersonalization ("my voice sounds strange to me") and derealization ("others seem like figures in a dream"), which define depersonalization/derealization disorder.
There is preserved reality testing and no psychosis.
Toronto Notes 2023 - Psychiatry, "Dissociative Disorders" Section:
"Depersonalization/derealization disorder involves persistent or recurrent experiences of detachment from oneself (depersonalization) or surroundings (derealization), with intact reality testing and no delusions or hallucinations." MCCQE1 Objectives (Psychiatry > 79-4: Dissociative Disorders):
"Candidates must identify depersonalization/derealization disorder as a dissociative disorder distinct from psychosis or mood disorders." Schizophrenia (A) would include hallucinations or disorganized thinking. Conversion disorder (B) presents with neurological symptoms inconsistent with known diseases. Persistent depressive disorder (D) involves chronic low mood. Delusional disorder (E) would involve fixed false beliefs, which are not present here.