Endoscopic retrograde cholangiopancreatography ERCP could not be performed because the patient did not cooperate. Biopsy by fine needle aspiration FNA guided by ultrasound showed an extension with marked cellularity with small to medium-sized polygonal and elongated cells with ovoid nuclei. They were sometimes indented with inconspicuous nucleoli and clear cytoplasm. They were scanty and eosinophilic.
Biopsia por aspiración con aguja fina BAAF guiada por ultrasonografía: Se observa un extendido con marcada celularidad, con células de pequeño a mediano tamaño, poligonales y elongadas, con núcleos ovoides, a veces indentados; nucléolo inconspicuo y citoplasma claro, escaso y eosinófilo.