The structure marked A is a hepatocellular adenoma — a benign but vascular lesion prone to hemorrhage and rupture, especially when >5 cm. The clinical presentation of acute RUQ pain and hypotension in a young woman on OCPs is the classic emergency scenario of intra-tumoral or intra-peritoneal hemorrhage from an adenoma. The imaging findings (arterial enhancement, isodensity in portal venous phase, intracellular fat on out-of-phase MRI) are pathognomonic for hepatocellular adenoma. In the acute setting with hemodynamic instability, emergency angiographic embolisation is the life-saving intervention to control bleeding, followed by cessation of the estrogenic stimulus (OCPs) and definitive surgical resection once stabilised. Per EASL and AASLD guidelines, hemorrhaging adenomas require urgent intervention.
EASL Guidelines on Benign Liver Tumors; AASLD
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