The diagnosis by fine needle aspiration biopsy of hydatid cyst of the pancreas.

We describe a case of pancreatic hydatid cyst in which the definitive diagnosis was made at fine needle aspiration cytology. The most common site of hydatid cyst is the liver (65%), followed by the lungs (25%). The hydatid cyst of the pancreas is rare since it accounts for less than 1% of the various sites of hydatid disease. The diagnosis may be difficult when the presentation is that of an unexplained epigastric mass or cyst, despite suggestive radiological and ultrasonographic features. Modern serology tests are positive in up to 80% of the abdominal hydatid cysts. It is mandatory to obtain a fine needle aspiration biopsy for definite diagnosis and for appropriate treatment planning. Surgical removal of the hydatid cyst still remains the most effective treatment.