Unprovoked DVT

A rather common run of the mill diagnosis. 75 year old lady with absolutely no past medical history comes in with a swollen left leg, no precipitating factors whatsoever. Premorbidly ambulant and well. No PMHx nor family history. All other bloods essentially normal apart from a d dimer of 15 and a scan which confirms extensive DVT up to almost the common femoral vein. Putting aside the more "esoteric" workup with prothrombin/ factor V leiden/ protein c and S, would a CT TAP for malignancy and abdominal/ LL imaging be considered excessive or expected? Thanks in advance!