Primary Function: HALO AP® is a software only device intended for viewing and management of digital images of scanned surgical pathology slides prepared from formalin-fixed paraffin embedded (FFPE) tissue. It is an instrument to aid a pathologist in review and interpretation of images for the purpose of primary diagnosis. HALO AP is not intended for use with frozen section, cytology, or non-FFPE hematopathology specimens. It is the responsibility of the pathologist to employ appropriate procedures and safeguards to assure the validity of the interpretation of images obtained and, where necessary, use conventional light microscopy review when making a diagnostic decision. HALO AP is intended for use with supported scanner images and monitor displays validated with test methods verified to meet required performance specifications. Pathologists should only use HALO AP in conjunction with their complete standard of care evaluation of the whole slide image.