A 6-year-old girl is brought to the emergency department with hymenal injuries. The hymen shows a posterior transection extending from 4 to 8 o'clock position through the full thickness. This finding is MOST consistent with:

• A Accidental straddle injury
• B Normal anatomical variant
• C Penetrating sexual assault ✓
• D Vaginal foreign body

Explanation

Full-thickness hymenal transection (extending to or through the posterior rim at the 3–9 o'clock arc) is highly specific for blunt penetrating trauma and is considered a definitive finding for sexual assault in prepubertal children. Accidental straddle injuries typically affect the anterior structures (labia, mons pubis, urethra, anterior commissure) but do NOT cause posterior hymenal transections because the anatomy of the perineum protects the hymen from straddle forces. Normal variants include notches (partial, superficial) at the 12 o'clock position. Vaginal foreign bodies cause localized inflammation without transection.

Reference: The Essentials of Forensic Medicine and Toxicology (Narayan Reddy), 34th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.