The Collaborative International Dictionary of English v.0.48:

aneurismatic \aneurismatic\ aneurysmal \aneurysmal\ aneurysmatic
\aneurysmatic\adj.
   1. of or pertaining to an aneurysm.

   Syn: aneurismal
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

aneurismal \an`eu*ris"mal\, Aneurysmal
\An`eu*rys"mal\([a^]n`[-u]*r[i^]z"mal), a. (Med.)
   Of or pertaining to an aneurism; as, an aneurismal tumor;
   aneurismal diathesis. The more common spelling is aneurysmal.
   [1913 Webster + AS]

WordNet (r) 3.0 (2006):

aneurysmal
    adj 1: relating to or affected by an aneurysm [syn:
           aneurysmal, aneurismal, aneurysmatic,
           aneurismatic]