Meconium Periorchitis

Meconium periorchitis — a sterile scrotal mass affecting 1 in 30,000 newborns — is routinely misdiagnosed as teratoma, potentially driving unnecessary orchiectomy

Journal: Pediatric and Developmental Pathology | Published: 2026-01-19 | Type: Case Report + Review | PMID: 41550077 Authors: Kulkarni Anusha et al. (Department of Histopathology and Pediatric Surgery, KEM Hospital, Pune, India) Funding/COI: Funding not listed; no conflicts of interest declared

Summary

Meconium periorchitis (MPO) is a rare neonatal condition where sterile meconium escapes through a patent processus vaginalis into the scrotum during gestation, forming a calcified para-testicular mass. It looks like a teratoma on imaging and at surgery. In this case, an 8-month-old presented with a firm scrotal cyst; intraoperative findings suggested teratoma, but histology confirmed MPO. The authors argue that unfamiliarity with this entity is what puts infant testicles at unnecessary risk.

Claims

• MPO occurs in approximately 1 in 30,000 live births
• Approximately 65% of cases require surgical intervention; a minority resolve spontaneously
• Pathophysiology: meconium peritonitis leads to sterile meconium leaking through a patent processus vaginalis into the developing scrotum
• Imaging shows scattered calcifications in a para-testicular mass, mimicking more concerning lesions
• Intraoperative appearance (complex solid-cystic lesion) is consistent with teratoma, creating a misdiagnosis trap
• Histopathological confirmation is required for definitive diagnosis

Study Quality

This is a single case report with a narrative literature review appended — the lowest tier of clinical evidence. No systematic search strategy is described for the review component. All prevalence and management statistics (1 in 30,000; 65% surgical rate) are sourced from prior literature, which is itself sparse given the condition's rarity. There is no patient comparison, no control group, and no outcome data beyond the index case's excision and histological diagnosis. The paper functions as a case description and educational flag, not a study generating new quantitative evidence.

Red Flags

• Single case: n=1
• Review component is narrative, not systematic — no search methodology disclosed
• Funding source not listed
• No follow-up data for the index case post-excision
• Prevalence and intervention rate figures are second-hand from prior literature, without formal synthesis
• No outcome comparison between surgical and conservatively managed cases

Strengths

• Documents histopathological findings that distinguish MPO from teratoma with clarity
• Identifies a real clinical consequence of misdiagnosis: unnecessary orchiectomy in an infant
• Well-documented case with imaging, surgical, and histological findings presented together
• No conflicts of interest
• Concise and focused; makes its point without padding

Verdict

A case report about a condition rare enough that most clinicians will encounter it zero times in a career — but the paper's contribution is exactly that awareness. A radiologist or pediatric surgeon who has never heard of meconium periorchitis may send an infant to orchiectomy for a benign calcified mass. As evidence, this sits at the base of the pyramid. As a clinical reminder that histology should precede irreversible surgery on a child's testicle, it earns its page count.