10 Parameters SUBTYPES SSMM: 19; LMM 2: Spitzoid: 2 Clark level I II III IV VBreslow: 0.3 to 0.6 (Mean: 0.39; Median 0.4)VGP: 15 RGP: 8Regression: Yes: 12 No: 12Mitoses: Absent: 20: Low: 2: High: 0
11 EQA Participants - 1I favour an (almost entirely) junctional Spitz nevusI think dysplastic compound naevus but with some superficial dermal nests with atypical melanocytes. ?enough cytological atypia for SSMM. Need levels + sections of whole lesionseverely dysplastic naevus with probable regression less than 1mm in depth
12 EQA Participants melanoma in situ with regression Severely dysplastic naevusit looks like a regressing Spitz naevus - Kamino bodies, ly infiltrate vascularity and focal fibrosisasymmetrical - irregular architecture. Atypical spitz I thinkAlthough only one nest in the dermis it is larger than the epidermal nest and hence favour vertical growth phase melanoma.
13 EQA ParticipantsLots of Kamino bodies. Epithelioid melanocytes. Compound. Some atypia but has history of punch biopsy. I think this is a Spitz naevus that has been previously traumatised by the punch biopsy.Difficult case- assymetrical lesion , cytological atypia more than expected for site specific naevi
14 EQA ParticipantsSome Kamino bodies and spitzoid nests but variation in nuclear atypia and features of dermal regression which is diffuse rather than focal.I think this is a compound DYSPLASTIC NAEVUS but would like to see more levels in view of history and previous biopsyI can't see the punch bx site
15 EQA ParticipantsFairly symmetrical lesion with numerous Kamino bodies. Limited dermal component with no mitotic figures.Has rather spizoid look. Unsure whether there is true dysplasia
16 Slide Club “Experts” Spitz & Clark’s dysplastic naevus (SPARK) x1 Spitz naevus x1Spitzoid lesion, mostly junctional but with a small intradermal element. Given the age of the patient we tend to call these atypical: Atypical Spitz x1