"Breast haemangiomas are reported to be found in ~1% of mastectomy specimens and 11% of post-mortem specimens. They can occur at almost any age with an age range between 18 months and 82 years."
Line 6:91·Only use medical adjectival hyphens where the letters at the end and start of the compound word are the same, e.g. post-transplant. In this case, don't use the hyphen: 'post-mortem'.