There are multiple definitions:

1. lymphovascular space invasion(English)

   • FIGO, ILN, LN, PLNM
   • Oncology, Lymphatic system/lymphoma
   • https://doi.org…3.rs-1041771/v1

2. left ventricular spherity index(English)

   • defined in terms of a spherity index (SI), and calculated as the ratio of end-diastolic short axis area (EDASa) and the mean long axis cavity area (EDAav) from the two apical views
   • EDA, EDV, EF, ESVI, LV, SI
   • Cardiology, Ratio-based metric, Medical imaging
   • https://doi.org…rheartj.a015273