LRRK2 and Kallmann syndrome: However, unlike in “idiopathic” PD, anosmia has been reported to be infrequent in LRRK2 PD cases (Marras et al., 2016) and also in LRRK2 carriers (Mestre et al., 2018; Mirelman et al., 2015; Pont‐Sunyer et al., 2017).