Sinus with Oestrus ovis third-stage larvae
Sinus with <i >Oestrus ovis</i> third-stage larvae
Sinus with Oestrus ovis third-stage larvae

    Gross pathology photograph of a cross-section of a sheep's head with multiple Oestrus ovis third-stage larvae in the nasal and paranasal sinuses.

Courtesy of Dr. Raffaele Roncalli.