Primitive neuroectodermal tumour in inguinal lymphnode with unknown primary, a clinical surprise

Primitive neuroectodermal tumour (PNET) is a tumour belonging to a group which presents classically with small blue round cells.42 year old female patient presented to us with complaints of painless swelling in the left groin for the past 9 months .CT abdomen and pelvis revealed left inguinal lymphadenopathy without identifying any primary. Patient underwent excision biopsy and further evaluation with translocation studies revealed it to be PNET, primary could not be identified. It is very rare to see such a case with PNET in lymphnodes with primary being unknown.