Pulmonary microinvasive small cell carcinoma with an extensive in‐situ component identified after photodynamic therapy for 'squamous cell carcinoma in situ': a case report. Issue 6 (5th March 2021) - Ota, Masayuki; Nakatani, Yukio; Nakajima, Takahiro; Hiroshima, Kenzo; Motoi, Noriko; Yoshino, Ichiro; Ikeda, Jun‐ichiro