ovarian microcystic stromal tumor https://www.malacards.org/card/microcystic_stromal_tumor A benign, unilateral tumor that arises from the ovary and is characterized by the presence of conspicuous microcystic changes, cellular areas, and a fibrous stroma. MONDO:0006339 GARD:0022304 microcystic stromal tumor MEDGEN:889995 Orphanet:569248 UMLS:C4054287 MCST microcystic stromal tumour NCIT:C121953 EFO:1000424 benign ovarian sex cord-stromal tumor