[Giant müllerian cyst. An infrequent cause of palpable hypogastric mass]

Due to its remarkable rarity, large volume and good post-operative evolution, the authors present one case of a cyst from Müller's duct debris, 18 x 16 cm in size, in a 22-year old male who presented with tangible mass in the hypogastrium and occasional nycturia. The size conditions the clinical symptomatology, although the are times such as this, when they can acquire a considerable volume and grow with practically no symptoms. Clinical history and diagnostic methodology are explained, pointing out the most relevant clinical criteria for proper differentiation from other entities, the complexity of differential diagnosis and the therapeutical procedure used.