Liver mucinous cystic neoplasm: a challenging diagnosis case report.

Introduction and importance: Liver mucinous cystic neoplasm is a rare tumor with a challenging pre-operative diagnosis, as for our patient. Presentation of case: A 43-year-old woman complained of dull, aching pain in the left hypochondrial region. Abdominal ultrasound demonstrated a solitary hypoechoic cyst within the left hepatic lobe. The initial suspected diagnosis was a hepatic hydatid cyst due to the country's endemicity. Magnetic resonance imaging (MRI) was consistent with a hepatic mucinous cystic neoplasm. A left hepatectomy was performed. Histopathological examination of the surgical specimen confirmed the diagnosis. No recurrence was observed during postoperative follow-up. Clinical discussion: Our case illustrated a rare entity with a challenging diagnosis. Liver mucinous cystic neoplasm could easily be misdiagnosed, especially in endemic areas. Appropriate exploration, such as MRI, had to be performed. Conclusion: Liver mucinous cystic neoplasms are rare tumors, with diagnosis delayed due to insufficient recognition; hence, radiological workup plays a crucial role. Complete surgical excision remains the treatment of choice.