My husband had cat scan done last week they found a 2x1.8 cm heterogenous in attenuation on left kidney suspicious for neoplasm can this be cance?

Yes, might be: It could be kidney cancer (renal cell carcinoma). Your husband is going to need a biopsy. And the usual way to do a kidney biopsy is to do actual surgery and take out the nodule. If it is cancer, he can be cured with just surgery (as long as it hasn't spread beyond the kidney).

Neoplasm: From the National Cancer Institute: Neoplasm An abnormal mass of tissue that results when cells divide more than they should or do not die when they should. Neoplasms may be benign (not cancer), or malignant (cancer). Also called tumor. Best to wait for further testing for clarification. Best wishes

Concern: You are asking a serious and life altering question that will require expertise (biopsy?), kindness, follow-up and coordinated Medical Care. This must be done through your physician and the team of physicians required for your husband's case. Wishing you strength as the answers come.