Lugano Lymphoma Response Classification Partial Remission by CT

**Semantic type:** Intellectual Product

**Definition:** For multiple lesions, greater than or equal to 50 percent decrease in the sum of the product of the perpendicular diameters of up to six target measurable nodes and extranodal sites. If only a single lesion is present, greater than or equal to 50 percent decrease in the cross product of the longest transverse diameter and perpendicular diameter.. Spleen must have regressed by >50% in length beyond normal" to the definition.

**Synonyms:** - PR - Partial Remission