In the workshop, 15 cases were submitted with the diagnosis of PCL/LPD, including 9 cases with the diagnosis of PC-MZL/PC-MZLPD, 4 cases with overlapping features between PC-MZLPD and PC-CD4 + T-cell LPD and 2 cases of PC-CD8 + T-cell LPD. The gene discussed is CD4; the disease is disseminated peritoneal leiomyomatosis.